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1. Performance of oxalic acid-chitosan/alumina ceramic biocomposite for the adsorption of a reactive anionic azo dye

Author:
John Pérez-Calderón; Alberto Scian; Martin Ducos; Victoria Santos; Noemí Zaritzky
Source:
Environmental science and pollution research 2021 v.28 no.47 pp. 67032-67052
ISSN:
0944-1344
Subject:
adsorbents; adsorption; aluminum oxide; azo dyes; biocomposites; ceramics; chitosan; cost effectiveness; crosslinking; desorption; electrostatic interactions; enthalpy; heat production; models; oxalic acid; pH; pollution; porosity; research; solubilization; sorption isotherms; sulfonates; wastewater
Abstract:
... A biocomposite system was developed and tested for the removal of the azo dye Reactive Red (RR195) from wastewater. The biocomposite was synthesized using ceramic particles containing 75% alumina which were coated using chitosan cross-linked with oxalic acid. The biocomposite showed high performance at low pH (maximum adsorption capacity = 345.3mg.g⁻¹ at pH=2.0). The physicochemical and structure ...
DOI:
10.1007/s11356-021-15123-7

2. Sorption behavior of 6:2 chlorinated polyfluorinated ether sulfonate (F-53B) on four kinds of nano-materials

Author:
Shiyi Zhao; Shanshan Liu; Fei Wang; Xingwen Lu; Zhe Li
Source:
Science of the total environment 2021 v.757 pp. 144064
ISSN:
0048-9697
Subject:
aluminum oxide; aquatic environment; bentonite; chromium; electrostatic interactions; heat production; hydrophilicity; hydrophobic bonding; kinetics; mists; nanoclays; nanowires; pH; particle size; sorbents; sorption; sulfonates; temperature; wastewater; zeta potential; China
Abstract:
... 6:2 chlorinated polyfluorinated ether sulfonate (with the trade name F-53B, a substitute for PFOS) is one type of Per- and polyfluoroalkyl substances (PFASs), which is widely used as a chromium mist inhibitor in China. It has been found in environment commonly. In this study, the sorption behavior of F-53B on four kinds of nano-materials: alumina nanopowder (ANP), alumina nanowires (ANW), hydrophi ...
DOI:
10.1016/j.scitotenv.2020.144064

3. Improved catalytic activity on the thermal decomposition of ammonium perchlorate and efficient adsorption of uranium using a novel ultra-low density Al2O3-based aerogels

Author:
Jun Liao; Yong Zhang; Lin Zhang
Source:
Journal of hazardous materials 2020 v.387 pp. 122015
ISSN:
0304-3894
Subject:
adsorption; aerogels; aluminum oxide; ammonium perchlorate; catalysts; catalytic activity; chitosan; differential scanning calorimetry; heat production; heat treatment; insulating materials; platinum; temperature; thermal conductivity; thermal degradation; thermogravimetry; uranium
Abstract:
... The ultra-low density AlCl₃-chitosan composite aerogel was prepared via a novel solution-freeze-drying technology. Then, the AlCl₃-chitosan aerogel was carbonized or calcined to remove the chitosan template, yielding ultra-low density Al₂O₃-based aerogels with good formation ability. The density of Al₂O₃-based aerogels were about 9 mg/cm³ via this method. Moreover, the Al₂O₃-based aerogel obtained ...
DOI:
10.1016/j.jhazmat.2020.122015

4. Suppression mechanism of Al dust explosion by melamine polyphosphate and melamine cyanurate

Author:
Haipeng Jiang; Mingshu Bi; Wei Gao
Source:
Journal of hazardous materials 2020 v.386 pp. 121648
ISSN:
0304-3894
Subject:
aluminum; aluminum oxide; boiling; chemical composition; combustion; droplets; dust; explosions; gases; heat production; kinetics; melamine; oxidants; phosphates; volatilization
Abstract:
... The suppression mechanism of melamine polyphosphate (MPP) and melamine cyanurate (MCA) for Al dust explosions is investigated experimentally and computationally. Results show that depending on the concentration of suppressants, the addition of MCA and MPP promotes or suppresses Al dust explosion. For high additive concentration, large agglomerated residues are generated, and condensed phase residu ...
DOI:
10.1016/j.jhazmat.2019.121648

5. Use of adsorption-influencing parameters for designing the batch adsorber and neural network–based prediction modelling for the aqueous arsenate removal using combustion synthesised nano-alumina

Author:
Roshan Prabhakar; Sukha Ranjan Samadder
Source:
Environmental science and pollution research 2020 v.27 no.21 pp. 26367-26384
ISSN:
0944-1344
Subject:
adsorption; aluminum oxide; arsenates; arsenic; arsenites; bicarbonates; chlorides; combustion; groundwater; heat production; models; nitrates; pH; phosphates; pollution; prediction; research; sorption isotherms; sulfates; temperature
Abstract:
... Removal of arsenic from water is of utmost priorities on a global scenario due to its ill effects. Therefore, in the present study, aluminium oxide nano-particles (nano-alumina) were synthesised via solution combustion method, which is self-propagating and eco-friendly in nature. Synthesised nano-alumina was further employed for arsenate removal from water. Usually, pre-oxidation of arsenite is pe ...
DOI:
10.1007/s11356-020-08975-y

6. Array Modified Molded Alumina Supported PdAg Catalyst for Selective Acetylene Hydrogenation: Intrinsic Kinetics Enhancement and Thermal Effect Optimization

Author:
Chenglin Miao; Luoyu Cai; Yanfei Wang; Xingjun Xu; Jiarui Yang; Yufei He; Dianqing Li; Junting Feng
Source:
Industrial & engineering chemistry process design and development 2021 v.60 no.23 pp. 8362-8374
ISSN:
1520-5045
Subject:
acetylene; active sites; aluminum oxide; carbon; catalysts; catalytic activity; desorption; endothermy; ethylene; heat production; heat transfer; hydrogenation; porous media; process design; surface area; temperature
Abstract:
... High temperature calcined spherical alumina material with macroporous structure is widely used in the typical strong exothermic industrial catalytic process due to its good heat transfer ability. Aiming at the problem that its low surface area limits the dispersion of active metals, an in situ growth method is applied to fabricate an alumina array on spherical alumina, while maintaining the heat t ...
DOI:
10.1021/acs.iecr.1c00423

7. Influences of mechanical activation and heating rate on reaction processes in combustion synthesis of NiAl-Al2O3 composites

Author:
Maryam Beyhaghi; Alireza Kiani-Rashid; Jalil Vahdati Khaki; Mehrdad Kashefi; Stefan Jonsson
Source:
Powder technology 2019 v.346 pp. 237-247
ISSN:
0032-5910
Subject:
X-ray diffraction; aluminum; aluminum oxide; combustion; differential thermal analysis; heat production; liquids; melting; nickel; nickel oxide; powders; scanning electron microscopy; temperature
Abstract:
... This paper investigates the combustion synthesis of NiAl-Al2O3 composites by the heating of Ni, NiO and Al powder mixture from 20 °C to 1300 °C. The influence of mechanical activation (without and with 1 h) and heating rate (20 °C/min and 40 °C/min) on thermal events in combustion synthesis process are investigated. Thermal events are assessed by Differential Thermal Analysis (DTA), X-Ray Diffract ...
DOI:
10.1016/j.powtec.2019.01.072

8. Enhanced performance of chemical looping combustion of methane by combining oxygen carriers via optimizing the stacking sequences

Author:
Xianming Cheng; Kongzhai Li; Xing Zhu; Yonggang Wei; Zhouhang Li; Yanhui Long; Min Zheng; Dong Tian; Hua Wang
Source:
Applied energy 2018 v.230 pp. 696-711
ISSN:
0306-2619
Subject:
aluminum oxide; carbon; carbon dioxide; catalysts; chemical interactions; combustion; cupric oxide; endothermy; ferric oxide; gasification; heat production; manganese oxides; methane; nickel; nickel oxide; oxidative stability; oxygen; silica; zirconium; zirconium oxide
Abstract:
... Combination of different types of oxides is a general strategy to prepare high performance oxygen carriers (OCs) for chemical looping combustion (CLC) technology. However, the possible chemical interactions among different components during the long-term redox cycling may reduce the stability of OCs. In the present work, we physically combine different types of OC sticks (i.e., CuO/SiO₂, Fe₂O₃/Al₂ ...
DOI:
10.1016/j.apenergy.2018.08.063

9. Experimental Investigation on the Separation Time in Compacted Thermite Using a Combustion Front Quenching Technique as Validation of a Phase Field Model

Author:
Sebastian Weiss; Jan Hantusch; Ingo Riehl; Ulrich Gross
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.39 pp. 13001-13009
ISSN:
1520-5045
Subject:
aluminum oxide; combustion; equations; heat production; iron; melting; models; prediction; process design; welding
Abstract:
... A combustion front quenching technique is used to investigate the separation of reaction products during a fast self-propagating high-temperature synthesis (SHS) thermite reaction, which is applied to the aluminothermic welding of rails. Quenching of the reaction zone with a melt temperature at approximately 2400 K enables the possibility of analyzing intermediate stages during exothermic SHS type ...
DOI:
10.1021/acs.iecr.8b02800

10. FeCrAl as a Catalyst Support

Author:
Gianluca Pauletto; Angelo Vaccari; Gianpiero Groppi; Lauriane Bricaud; Patricia Benito; Daria C. Boffito; Johannes A. Lercher; Gregory S. Patience
Source:
Chemical reviews 2020 v.120 no.15 pp. 7516-7550
ISSN:
1520-6890
Subject:
alloys; aluminum oxide; carbon; catalysts; endothermy; heat production; mass transfer; natural gas; oxidation; synthesis gas; thermal conductivity
Abstract:
... The iron-chromium-aluminum alloy (FeCrAl) is an exceptional support for highly exothermic and endothermic reactions that operate above 700 °C in chemically aggressive environments, where low heat and mass transfer rates limit reaction yield. FeCrAl two- and three-dimensional structured networks—monoliths, foams, and fibers—maximize mass transfer rates, while their remarkable thermal conductivity m ...
DOI:
10.1021/acs.chemrev.0c00149

11. Hydrogen Spillover to Copper Clusters on Hydroxylated γ-Al2O3

Author:
Gang Feng; Maria Verónica Ganduglia-Pirovano; Chun-Fang Huo; Joachim Sauer
Source:
Journal of physical chemistry 2018 v.122 no.32 pp. 18445-18455
ISSN:
1932-7455
Subject:
aluminum oxide; copper; density functional theory; endothermy; energy; heat production; hydrogen; hydroxylation; physical chemistry
Abstract:
... Density functional theory is used to examine the binding of Cuₙ (n = 1–5) clusters onto γ-Al₂O₃(110) surfaces. Weak binding of Cu clusters onto a clean surface leads to three-dimensional growth. On a hydroxylated surface, hydroxyl H atoms spillover to the deposited Cu clusters, yielding oxidized Cu clusters that bind more strongly to the surface. For a single Cu atom and the Cu dimer, the energy b ...
DOI:
10.1021/acs.jpcc.8b03764

12. Methanation of coke oven gas over Ni-Ce/γ-Al2O3 catalyst using a tubular heat exchange reactor: Pilot-scale test and process optimization

Author:
Zhifeng Qin; Yingjie Zhao; Qun Yi; Lijuan Shi; Congming Li; Xiaoliang Yan; Jun Ren; Maoqian Miao; Kechang Xie
Source:
Energy conversion and management 2020 v.204 pp. 112302
ISSN:
0196-8904
Subject:
aluminum oxide; carbon dioxide; catalysts; computer software; energy efficiency; greenhouse gas emissions; heat production; heat transfer; market competition; methane production; natural gas; nickel; ovens; temperature
Abstract:
... Traditional industrial methanation of coke oven gas (COG) to produce natural gas generally requires three or more adiabatic reactors, thus resulting in a longprocess flow, rapid deactivation of catalyst and high investment cost. Herein, a new methanation process of COG (denoted as NCtSNG) over the Ni-Ce/γ-Al₂O₃ catalyst was proposed, wherein a tubular heat exchange reactor and an adiabatic reactor ...
DOI:
10.1016/j.enconman.2019.112302

13. The effects of water vapor and coal ash on the carbonation behavior of CaO-sorbent supported by γ-Al2O3 for CO2 capture

Author:
Liangyong Chen; Neng Qian
Source:
Fuel processing technology 2018 v.177 pp. 200-209
ISSN:
0378-3820
Subject:
aluminum oxide; calcium; calcium oxide; carbon dioxide; carbonation; carrying capacity; coal; combustion; flue gas; fluidized beds; heat production; sorbents; water vapor
Abstract:
... Coal ash and water vapor are usually present in the flue gas derived from coal combustion, which inevitably impact the performance of calcium sorbents in a Calcium-Looping process for CO2 capture. This study investigated the influence of high-temperature water vapor and coal ash on the carbonation behavior of γ-Al2O3-supported calcium sorbent in a fluidized-bed reactor and a TGA apparatus. It was ...
DOI:
10.1016/j.fuproc.2018.04.028

14. A yolk/shell strategy for designing hybrid phase change materials for heat management in catalytic reactions

Author:
Kongzhai Li; Xianming Cheng; Ningning Li; Xing Zhu; Yonggang Wei; Kang Zhai; Hua Wang
Source:
Journal of materials chemistry A 2017 v.5 no.46 pp. 24232-24246
ISSN:
2050-7496
Subject:
aluminum; aluminum oxide; catalysts; catalytic activity; combustion; endothermy; freezing; heat production; latent heat; melting; microparticles; models; nanoparticles; nickel; oxygen; storage technology; temperature; thermal conductivity; thermal energy
Abstract:
... Thermal energy storage technology is a promising option for implementing thermal management in advanced chemical processes, and phase change materials (PCMs) are recognized as the ideal thermal storage materials due to their high heat storage density and moderate temperature variation in charging/discharging processes. Herein, a yolk/shell strategy is firstly introduced to encapsulate PCMs with ca ...
DOI:
10.1039/c7ta07147g

15. Adsorption of 17β-estradiol from aqueous solutions by a novel hierarchically nitrogen-doped porous carbon

Author:
Qingyun Duan; Xuede Li; Zheng Wu; Ahmed Alsaedi; Tasawar Hayat; Changlun Chen; Jie Li
Source:
Journal of colloid and interface science 2019 v.533 pp. 700-708
ISSN:
0021-9797
Subject:
adsorption; aluminum oxide; aquatic environment; aqueous solutions; carbon; estradiol; heat production; humic acids; ions; kaolin; montmorillonite; silica; sorption isotherms; water salinity
Abstract:
... A novel interconnected hierarchically nitrogen-doped porous carbon (IHNPC) derived from metal-organic framework-based composites was obtained via a facile method and applied as a superior material for the capture of 17β-estradiol (E2) from aqueous solution. The adsorption kinetic and isotherm behaviors were well described by the pseudo-second-order and Langmuir models. Various thermodynamic parame ...
DOI:
10.1016/j.jcis.2018.09.007

16. An unknown component of a selective and mild oxidant: structure and oxidative ability of a double salt-type complex having κ¹O-coordinated permanganate anions and three- and four-fold coordinated silver cations

Author:
Gréta Bettina Kovács; Nóra V. May; Petra Alexandra Bombicz; Szilvia Klébert; Péter Németh; Alfréd Menyhárd; Gyula Novodárszki; Vladimir Petrusevski; Fernanda Paiva Franguelli; József Magyari; Kende Béres; Imre Miklós Szilágyi; László Kótai
Source:
RSC advances 2019 v.9 no.49 pp. 28387-28398
ISSN:
2046-2069
Subject:
aluminum oxide; anions; benzaldehyde; benzyl alcohol; carbon dioxide; carbonates; catalysts; cations; chemical reduction; encapsulation; heat production; hydrogen bonding; ligands; manganese oxides; nanosilver; organic chemistry; oxidants; oxidation; oxygen; pyridines; silver; solvents
Abstract:
... Compounds containing redox active permanganate anions and complexed silver cations with reducing pyridine ligands are used not only as selective and mild oxidants in organic chemistry but as precursors for nanocatalyst synthesis in low-temperature solid-phase quasi-intramolecular redox reactions. Here we show a novel compound (4Agpy₂MnO₄·Agpy₄MnO₄) that has unique structural features including (1) ...
DOI:
10.1039/c9ra03230d

17. Highly Efficient Removal of Lead Ions from Aqueous Solutions Using Chitosan/Rice Husk Ash/Nano Alumina with a Focus on Optimization by Response Surface Methodology: Isotherm, Kinetic, and Thermodynamic Studies

Author:
Shiva Fooladgar; Abbas Teimouri; Shima Ghanavati Nasab
Source:
Journal of polymers and the environment 2019 v.27 no.5 pp. 1025-1042
ISSN:
1566-2543
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; adsorbents; adsorption; aluminum oxide; aqueous solutions; chitosan; heat production; husk ash; ions; lead; models; nanocomposites; pH; response surface methodology; rice hulls; scanning electron microscopy; sorption isotherms; temperature
Abstract:
... In the present study, an adsorbent named chitosan/rice husk ash/nano-γ alumina was prepared and used for the removal of lead ions from aqueous solutions. It was characterized by FESEM, FTIR, XRD, and BET. The important and interactive effects of some considered parameters, such as the initial lead ion concentration, pH, adsorbent mass and contact time, were estimated and optimized by using the cen ...
DOI:
10.1007/s10924-019-01385-3

18. Hydrogen Production via the Catalytic Partial Oxidation of Ethanol on a Platinum–Rhodium Catalyst: Effect of the Oxygen-to-Ethanol Molar Ratio and the Addition of Steam

Author:
B. Sawatmongkhon; K. Theinnoi; T. Wongchang; C. Haoharn; C. Wongkhorsub; A. Tsolakis
Source:
Energy & fuels 2019 v.33 no.7 pp. 6742-6753
ISSN:
1520-5029
Subject:
aluminum oxide; carbon dioxide; carbon monoxide; catalysts; catalytic activity; cracking; endothermy; ethanol; fuels; heat production; hydrogen; hydrogen production; methane; oxidation; steam; temperature profiles; water content
Abstract:
... To produce hydrogen for automotive exhaust gas aftertreatment systems, the catalytic partial oxidation of ethanol over a platinum–rhodium catalyst supported on alumina is examined via experimental studies as well as thermodynamic analysis. The research focuses on the effects of the ethanol concentration, oxygen-to-ethanol molar ratio, and water content of ethanol on the ethanol conversion and prod ...
DOI:
10.1021/acs.energyfuels.9b01398

19. Novel Al₂O₃/GO/halloysite nanotube composite for sequestration of anionic and cationic dyes

Author:
M. A. Barakat; Rajeev Kumar; M. Balkhyour; Md. Abu Taleb
Source:
RSC advances 2019 v.9 no.24 pp. 13916-13926
ISSN:
2046-2069
Subject:
2-chlorophenol; X-ray diffraction; X-ray photoelectron spectroscopy; adsorbents; adsorption; aluminum oxide; copper; halloysite; heat production; heavy metals; methylene blue; models; nanocomposites; nanotubes; oxytetracycline; pH; pollutants; scanning electron microscopy; sorption isotherms; temperature; transmission electron microscopy; wastewater
Abstract:
... In this study, an Al₂O₃/graphene oxide/halloysite nanotube (Al₂O₃/GO/HNT) nanocomposite has been synthesized and used as an adsorbent for the sequestration of cationic methylene blue (MB) and anionic congo red (CR) dyes from wastewater. The properties of the synthesized Al₂O₃/GO/HNT were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy ...
DOI:
10.1039/c9ra02246e

20. Phase Rule and the Universality of Critical Phenomena in Chemically Reacting Liquid Mixtures

Author:
James K. Baird; Joshua R. Lang; Xingjian Wang; Anusree Mukherjee; Pauline Norris
Source:
Journal of physical chemistry 2019 v.123 no.26 pp. 5545-5554
ISSN:
1520-5207
Subject:
aluminum oxide; atmospheric pressure; barium; chemical equilibrium; copper; endothermy; heat production; indole butyric acid; isobutyric acid; liquids; manganese dioxide; solvents; temperature
Abstract:
... Critical effects have been reported in the case of chemical equilibria, in which the solvent is a binary liquid mixture having a critical point of solution. At atmospheric pressure and for temperatures near the critical point, the critical effect manifests itself as a divergence in the temperature derivative of the extent of reaction. For a critical mixture of isobutyric acid + water (IBA/H₂O) ser ...
DOI:
10.1021/acs.jpcb.9b02978

21. Facile Synthesis of Al@Al₂O₃ Microcapsule for High-Temperature Thermal Energy Storage

Author:
Kongzhai Li; Zhenhua Gu; Xing Zhu; Yonggang Wei; Hua Wang
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.10 pp. 13226-13236
ISSN:
2168-0485
Subject:
activation energy; air; aluminum; aluminum oxide; corrosion; encapsulation; heat production; latent heat; liquids; melting; monitoring; nickel; oxidation; oxygen consumption; supercooling; thermal energy; thermal stress
Abstract:
... Preparation of high-temperature encapsulated phase change materials (PCMs) is very challengeable due to the high chemical corrosion of liquid metal and the high thermal stress caused by volume expansion. We herein report a novel strategy for preparing high-temperature Al@Al₂O₃ PCM. In this method, nano Ni species are loaded on the surface of Al spheres, which could accelerate the oxidation of the ...
DOI:
10.1021/acssuschemeng.8b02840

22. Safe preparation, energetic performance and reaction mechanism of corrosion-resistant Al/PVDF nanocomposite films

Author:
Xiang Ke; Shuangfeng Guo; Gensheng Zhang; Xiang Zhou; Lei Xiao; Gazi Hao; Ning Wang; Wei Jiang
Source:
Journal of materials chemistry 2018 v.6 no.36 pp. 17713-17723
ISSN:
2050-7496
Subject:
air; aluminum; aluminum oxide; combustion; freeze drying; fuels; heat production; hydrophobicity; manufacturing; melting point; nanocomposites; nanoparticles; nitrogen; oxidants; powders; reaction mechanisms; temperature; thermal analysis; thermoplastics
Abstract:
... In this study, to improve the safety in the preparation process of energetic materials, vacuum freeze-drying technology is applied to develop nanoenergetic thin films in which Al nanoparticles (Al NPs) are used as the fuel and polyvinylidene fluoride (PVDF) powders act as the oxidant. The whole process effectively avoids high temperature and thus ensures operational safety. The morphology and comp ...
DOI:
10.1039/c8ta05758c

23. Sorption isotherms, kinetic and optimization process of amino acid proline based polymer nanocomposite for the removal of selected textile dyes from industrial wastewater

Author:
Sharista Raghunath; K. Anand; R.M. Gengan; Mithil Kumar Nayunigari; Arjun Maity
Source:
Journal of photochemistry and photobiology 2016 v.165 pp. 189-201
ISSN:
1011-1344
Subject:
Fourier transform infrared spectroscopy; Gibbs free energy; X-ray photoelectron spectroscopy; adsorption; aluminum oxide; bentonite; cost effectiveness; desorption; dyes; energy; energy-dispersive X-ray analysis; fabrics; heat production; image analysis; industrial effluents; kinetics; light scattering; models; nuclear magnetic resonance spectroscopy; pH; polymer nanocomposites; polymers; proline; remediation; scanning electron microscopy; sorption isotherms; temperature; transmission electron microscopy; wastewater; wastewater treatment; zeta potential
Abstract:
... In this article, adsorption and kinetic studies were carried out on three textile dyes, namely Reactive Blue 222 (RB 222), Reactive Red 195 (RR 195) and Reactive Yellow 145 (RY 145). The dyes studied in a mixture were adsorbed under various conditions onto PRO-BEN, a bentonite modified with a new cationic proline polymer (l-proline-epichlorohydrin polymer). The proline polymer was characterized by ...
DOI:
10.1016/j.jphotobiol.2016.10.012

24. The Effect of the Soil Properties on Adsorption, Single-Point Desorption, and Degradation of Chlorpyrifos in Two Agricultural Soil Profiles From Colombia

Author:
Carmen Stella Mosquera-Vivas; Eddy Walther Hansen; Glenda García-Santos; Nelson Obregón-Neira; Raul Ernesto Celis-Ossa; Carlos Alberto González-Murillo; Ronnie Juraske; Stefanie Hellweg; Jairo Arturo Guerrero-Dallos
Source:
Soil science 2016 v.181 no.9/10 pp. 446-456
ISSN:
0038-075X
Subject:
Andisols; Entisols; Fourier transform infrared spectroscopy; adsorption; agricultural productivity; agricultural soils; aluminum oxide; cation exchange capacity; chlorpyrifos; desorption; groundwater; heat production; hysteresis; kaolinite; leaching; nuclear magnetic resonance spectroscopy; organic carbon; pH; soil depth; soil organic matter; soil profiles; vadose zone; Colombia
Abstract:
... Structural composition of soil organic matter and the adsorption/desorption characteristics of the insecticide chlorpyrifos were investigated in two soil profiles (Andisol and Entisol) under agriculture production using Fourier transform infrared spectroscopy, nuclear magnetic resonance, and batch analysis methods. Throughout the soil profile, the Andisol had larger values of pH, organic carbon co ...
DOI:
10.1097/SS.0000000000000174

25. Activating Aluminum Reactivity with Fluoropolymer Coatings for Improved Energetic Composite Combustion

Author:
McCollum Jena; Pantoya Michelle L.; Iacono Scott T.
Source:
ACS Applied Materials & Interfaces 2015 v.7 no.33 pp. 18742-18749
ISSN:
1944-8252
Subject:
X-ray photoelectron spectroscopy; aluminum; aluminum oxide; coatings; combustion; cupric oxide; differential scanning calorimetry; dissociation; energy; fluorine; heat production; mass spectrometry; molybdenum; oxidants; polymers; reaction kinetics
Abstract:
... Aluminum (Al) particles are passivated by an aluminum oxide (Al₂O₃) shell. Energetic blends of nanometer-sized Al particles with liquid perfluorocarbon-based oxidizers such as perfluoropolyethers (PFPE) excite surface exothermic reaction between fluorine and the Al₂O₃ shell. The surface reaction promotes Al particle reactivity. Many Al-fueled composites use solid oxidizers that induce no Al₂O₃ sur ...
DOI:
10.1021/acsami.5b05238

26. Computational study of α-M₂O₃ (M = Al, Ga): surface properties, water adsorption and oxidation

Author:
Manh-Thuong Nguyen
Source:
RSC advances 2015 v.5 no.48 pp. 38601-38609
ISSN:
2046-2069
Subject:
adsorption; aluminum; aluminum oxide; dissociation; energy; geometry; heat production; oxidation; oxygen; stoichiometry
Abstract:
... We present a density-functional study on the properties of two corundum-type solid surfaces, α-Al₂O₃(0001) and α-Ga₂O₃(0001), and water adsorption and oxidation on these substrates. The relative stability and the geometric and electronic properties of various terminations of α-M₂O₃(0001) (M = Al, Ga), namely, O₃–M–M– (named S₁), O₂–M–M– (S₂), O₁–M–M– (S₃), M–M–O₃– (S₄) and M–O₃–M– (S₅), were first ...
DOI:
10.1039/c5ra00222b

27. Evaluation of natural organic matter adsorption on Fe-Al binary oxide: Comparison with single metal oxides

Author:
Kyung-Jo Kim; Am Jang
Source:
Chemosphere 2017 pp. -
ISSN:
0045-6535
Subject:
Food and Agriculture Organization; Gibbs free energy; adsorbents; adsorption; aluminum; aluminum oxide; aluminum sulfate; bovine serum albumin; enthalpy; entropy; fluorescence; heat production; humic acids; hydrophilicity; hydrophobicity; iron oxides; kinetics; models; pH; particle size; sodium alginate; sorption isotherms; surface area; surface water
Abstract:
... The adsorption characteristics of three types of standard natural organic matter (NOM) on iron-aluminum (Fe-Al) binary oxide (FAO) and heated aluminum oxide (HAO) under natural surface water condition were investigated using various adsorption isotherms and kinetic models. FAO was synthesized by Fe oxide and Al oxide, mixed using the sol-gel hydrothermal method, and aluminum sulfate was used to ma ...
DOI:
10.1016/j.chemosphere.2017.07.007

28. Fluorination of an Alumina Surface: Modeling Aluminum–Fluorine Reaction Mechanisms

Author:
Richa Padhye; Adelia J. A. Aquino; Daniel Tunega; Michelle L. Pantoya
Source:
ACS applied materials & interfaces 2017 v.9 no.28 pp. 24290-24297
ISSN:
1944-8252
Subject:
acetone; aluminum; aluminum oxide; density functional theory; energy; heat production; hydrogen bonding; models; moieties; powders; reaction kinetics; reaction mechanisms; screening
Abstract:
... Density functional theory (DFT) calculations were performed to examine exothermic surface chemistry between alumina and four fluorinated, fragmented molecules representing species from decomposing fluoropolymers: F–, HF, CH₃F, and CF₄. The analysis has strong implications for the reactivity of aluminum (Al) particles passivated by an alumina shell. It was hypothesized that the alumina surface stru ...
DOI:
10.1021/acsami.7b05372

29. Mechanisms of LiCoO2 Cathode Degradation by Reaction with HF and Protection by Thin Oxide Coatings

Author:
Tebbe Jonathon L.; Holder Aaron M.; Musgrave Charles B.
Source:
ACS Applied Materials & Interfaces 2015 v.7 no.43 pp. 24265-24278
ISSN:
1944-8252
Subject:
aluminum; aluminum oxide; cathodes; coatings; heat production; methodology; zinc; zinc oxide
Abstract:
... Reactions of HF with uncoated and Al and Zn oxide-coated surfaces of LiCoO₂ cathodes were studied using density functional theory. Cathode degradation caused by reaction of HF with the hydroxylated (101̅4) LiCoO₂ surface is dominated by formation of H₂O and a LiF precipitate via a barrierless reaction that is exothermic by 1.53 eV. We present a detailed mechanism where HF reacts at the alumina coa ...
DOI:
10.1021/acsami.5b07887

30. Oscillatory Behavior and Anomalous Heat Evolution in Recombination of H2 and O2 on Pd-based Catalysts

Author:
Lalik Erwin; Drelinkiewicz Alicja; Kosydar Robert; Szumełda Tomasz; Bielańska Elżbieta; Groszek Dan; Iannetelli Angelo; Groszek Martin
Source:
Industrial & Engineering Chemistry Research 2015 v.54 no.28 pp. 7047-7058
ISSN:
1520-5045
Subject:
aluminum oxide; calorimetry; catalysts; engineering; gold; heat production; hydrogen; oxidation; oxygen; palladium; titration
Abstract:
... Gas flow-through microcalorimetry has been applied to study the Pd/Al₂O₃ type catalysts in the exothermic hydrogen recombination process: H₂ + O₂ → H₂O, in view of the potential application in the passive autocatalytic recombination (PAR) technology. The flow mode experiments revealed thermokinetic oscillations, i.e., the oscillatory rate of heat evolution accompanying the process and the correspo ...
DOI:
10.1021/acs.iecr.5b00686

31. A thermally self-sustaining solid oxide fuel cell system at ultra-low operating temperature (319 °C)

Author:
Ikwhang Chang; Jiwoong Bae; Joonho Park; Sunho Lee; Myeongseok Ban; Taehyun Park; Yoon Ho Lee; Han Ho Song; Young-Beom Kim; Suk Won Cha
Source:
Energy 2016 v.104 pp. 107-113
ISSN:
0360-5442
Subject:
air; aluminum oxide; ambient temperature; anodes; catalysts; cathodes; electric power; energy conversion; fuel cells; fuels; heat production; hydrogen; platinum; thermal stability
Abstract:
... A thermally stable and self-sustainable portable energy conversion system is designed using low temperature thin film SOFCs (solid oxide fuel cells). Hydrogen and air gases are fed into this system, which is successfully operated at 319 °C. Each cell, comprised of Pt (anode)/YSZ-GDC-YSZ/Pt (cathode), is manufactured using sputtering and atomic layer deposition, and the area of a single cell is 2.5 ...
DOI:
10.1016/j.energy.2016.03.099

32. Arsenic mitigation by chitosan-based porous magnesia-impregnated alumina: performance evaluation in continuous packed bed column

Author:
S. Saha; P. Sarkar
Source:
International journal of environmental science and technology 2016 v.13 no.1 pp. 243-256
ISSN:
1735-1472
Subject:
adsorbents; adsorption; aluminum oxide; arsenates; arsenic; biopolymers; chitosan; energy-dispersive X-ray analysis; experimental design; groundwater contamination; heat production; magnesium; pH; porous media; scanning electron microscopy; sodium hydroxide; toxicity
Abstract:
... Dissolved arsenic in contaminated groundwater is a major concern on a global scale due to its extreme toxicity. This paper reports a magnesium oxide-impregnated mesoporous alumina synthesized using biopolymer chitosan template. The adsorbent was first characterized by BET, SEM and EDAX analysis. The packed column performed effectively over wide range of pH and exhibited a maximum adsorption capaci ...
DOI:
10.1007/s13762-015-0806-1

33. Catalytic wet air oxidation of high-concentration organic pollutants by upflow packed-bed reactor using a Ru–Ce catalyst derived from a Ru₃(CO)₁₂ precursor

Author:
Chaoying Yu; Xu Meng; Gexin Chen; Peiqing Zhao
Source:
RSC advances 2016 v.6 no.27 pp. 22633-22638
ISSN:
2046-2069
Subject:
X-ray photoelectron spectroscopy; air; aluminum oxide; catalysts; chemical oxygen demand; heat production; hydrogen; liquids; oxidation; pollutants; temperature; thermal degradation
Abstract:
... Low loading catalysts Ru/γ-Al₂O₃ and Ru–Ce/γ-Al₂O₃ (Ru: 0.3 wt%) were prepared by thermolysis of Ru₃(CO)₁₂, which exhibited high activity in Catalytic Wet Air Oxidation (CWAO) of high concentration organic pollutants by upflow packed-bed reactor with initial COD 200 000 mg L⁻¹. XPS results revealed that two new Ru species (RuA and RuB) were detected due to the chemical interaction between Ru₃(CO)₁ ...
DOI:
10.1039/c5ra27723j

34. Efficient formation of nitriles in the vapor-phase catalytic dehydration of aldoximes

Author:
Daolai Sun; Eisyun Kitamura; Yasuhiro Yamada; Satoshi Sato
Source:
Green chemistry 2016 v.18 no.11 pp. 3389-3396
ISSN:
1463-9270
Subject:
acetonitrile; acids; active sites; aluminum oxide; catalysts; catalytic activity; green chemistry; heat production; porosity; silica; surface area; temperature; zeolites; zirconium oxide
Abstract:
... A vapor-phase dehydration of acetaldoxime to acetonitrile was investigated over various solid catalysts. Among the tested catalysts, ZrO₂, Al₂O₃ and SiO₂ showed high catalytic activity for the formation of acetonitrile from acetaldoxime, while the correlation between catalytic activity and the acid property of the catalysts was not observed. Weak acidic sites such as silanols sufficiently work as ...
DOI:
10.1039/c6gc00384b

35. Highly stable Ni/SiC catalyst modified by Al₂O₃ for CO methanation reaction

Author:
Guojing Jin; Fangna Gu; Qing Liu; Xiaoyan Wang; Lihua Jia; Guangwen Xu; Ziyi Zhong; Fabing Su
Source:
RSC advances 2016 v.6 no.12 pp. 9631-9639
ISSN:
2046-2069
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; aluminum oxide; carbon monoxide; catalysts; catalytic activity; energy-dispersive X-ray analysis; heat production; methane production; natural gas; nickel; nitrogen; scanning electron microscopy; silicon carbide; thermogravimetry; transmission electron microscopy
Abstract:
... It is still a great challenge to prevent sintering of supported Ni catalysts in highly exothermic reactions. To address this problem, in this work, highly thermal conductive and stable SiC is explored as a Ni catalyst support for CO methanation to produce synthetic natural gas; simultaneously, Al₂O₃ is utilized to modify the SiC surface to enhance the interaction between the metal and support and ...
DOI:
10.1039/c5ra19940a

36. Preparation of palladium impregnated alumina adsorbents: Thermal and neutron activation analysis

Author:
Sumanta Mukherjee; N.K. Gupta; S.P. Roy; S. Dash; A. Kumar; Y.R. Bamankar; T.V. Vittal Rao; N. Kumar; Y. Naik
Source:
Thermochimica acta 2016 v.625 pp. 56-64
ISSN:
0040-6031
Subject:
Fourier transform infrared spectroscopy; adsorbents; aluminum oxide; differential thermal analysis; gels; heat production; helium; light microscopy; microparticles; neutron activation analysis; oxidation; oxygen; palladium; scanning electron microscopy; silver; sol-gel processing; surface area; temperature; thermogravimetry; urea nitrate
Abstract:
... Pd/Al2O3 composite microspheres particles with high surface area were prepared sol–gel process. The decomposition of dried gel-particles was studied by TGA/DTA and FT-IR technique. TGA studies indicated that formation of palladium is marked by a broad exothermic peak with a loss of water and oxidation of trapped HMTA/Urea nitrate mixture. The main decomposition reaction took place in the temperatu ...
DOI:
10.1016/j.tca.2015.11.016

37. Simultaneous adsorption of fluoride and hexavalent chromium by synthetic mesoporous alumina: performance and interaction mechanism

Author:
Tianguo Li; Daolei Xie; Changhua He; Xiaojun Xu; Bin Huang; Rui Nie; Shuli Liu; Zhengyang Duan; Wei Liu
Source:
RSC advances 2016 v.6 no.54 pp. 48610-48619
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; active sites; adsorbents; adsorption; aluminum oxide; aqueous solutions; chromium; electrostatic interactions; endothermy; fluorides; heat production; kinetics; moieties; porous media; sorption isotherms; surface water; water pollution
Abstract:
... Combined pollution by fluoride (F⁻) and hexavalent chromium (Cr(vi)) in water bodies causes much environmental concern and its treatment is of the utmost importance. This study first evaluates the efficiency of the simultaneous adsorption of F⁻ and Cr(vi) from aqueous solutions using a sol–gel synthesized mesoporous alumina (MA) adsorbent. Adsorption properties show that the sorption of F⁻ is spon ...
DOI:
10.1039/c6ra04604e

38. Thermal analysis of in-situ Al2O3/SiO2(p)/Al composites fabricated by stir casting process

Author:
Kang Wang; Wenfang Li; Jun Du; Lu Yang; Peng Tang
Source:
Thermochimica acta 2016 v.641 pp. 29-38
ISSN:
0040-6031
Subject:
X-ray diffraction; aluminum; aluminum oxide; cooling; energy-dispersive X-ray analysis; heat production; melting; microstructure; scanning electron microscopy; silica; silicon; solidification; temperature; thermal analysis
Abstract:
... The in-situ fabricated Al2O3/SiO2(p)/Al composites were produced by adding different quantities of SiO2 particles (viz. 0, 3, 6 and 9wt.%) into molten commercial purity Al at 750°C. Newtonian thermal analysis was conducted to investigate the solidification behaviors of these molten composites prepared by the stir casting process. The microstructure and phase identification were achieved via optica ...
DOI:
10.1016/j.tca.2016.08.009

39. Examining Hydroxyl–Alumina Bonding toward Aluminum Nanoparticle Reactivity

Author:
Padhye Richa; McCollum Jena; Korzeniewski Carol; Pantoya Michelle L.
Source:
The Journal of Physical Chemistry C 2015 v.119 no.47 pp. 26547-26553
ISSN:
1932-7455
Subject:
acetone; aluminum; aluminum oxide; catalytic activity; combustion; differential scanning calorimetry; fuels; heat production; hexane; hydrogen bonding; infrared spectroscopy; nanoparticles; solvents; thermal energy
Abstract:
... The stabilizing, amorphous alumina (Al₂O₃) passivation layer surrounding aluminum (Al) particles participates in reactions that lower barriers to bulk Al oxidation. The behavior has been observed in thermites comprised of nanoscale Al particles (nano-Al) dispersed within a fluoropolymer matrix. Studies reported herein show the oxide passivation shell on nano-Al particles is affected by the polarit ...
DOI:
10.1021/acs.jpcc.5b08408

40. Mixed Alcohol Synthesis over a K Promoted Cu/ZnO/Al2O3 Catalyst in Supercritical Hexanes

Author:
Xu Rui; Zhang Sihe; Roberts Christopher B.
Source:
Industrial & Engineering Chemistry Research 2013 v.52 no.41 pp. 14514-14524
ISSN:
1520-5045
Subject:
aluminum oxide; carbon dioxide; catalysts; copper; engineering; heat production; hexane; isomers; methane; methanol; solvents; synthesis gas; temperature; zinc oxide
Abstract:
... Mixed alcohol synthesis (MAS) from syngas involves an overall reduction in the number of moles (i.e., volume reduction) and is highly exothermic. As such, the high-pressure, dense-phase solvent conditions of a supercritical reaction medium afford opportunities to enhance the performance of these reactions. In this paper, the effect of supercritical hexanes (a mixture of hexane isomers) on the reac ...
DOI:
10.1021/ie3024017

41. On the Effect of the Presence of Solid Diluents during Zn Oxidation by CO2

Author:
Stamatiou Anastasia; Steinfeld Aldo; Jovanovic Zoran R.
Source:
Industrial & Engineering Chemistry Research 2013 v.52 no.5 pp. 1859-1869
ISSN:
1520-5045
Subject:
aluminum oxide; carbon dioxide; carbon monoxide; endothermy; engineering; fuels; heat production; hydrogen; mass transfer; mixing; oxidation; oxygen; reaction mechanisms; solar radiation; synthesis gas; thermal degradation; thermogravimetry; zinc; zinc oxide
Abstract:
... We consider the solar thermochemical production of H₂ and CO (syngas) from H₂O and CO₂ via a two-step ZnO/Zn redox cycle. The first step, driven by concentrated solar radiation, is the endothermic thermolysis of ZnO producing a gaseous mixture of O₂ and Zn-vapor, which upon quenching precipitates a solid residue comprising Zn and ZnO in variable ratios. The second, nonsolar step is the exothermic ...
DOI:
10.1021/ie302643g

42. Tailoring oxidation of Al particles morphologically controlled by carbon nanotubes

Author:
Hye Yun Jeong; Kang Pyo So; Jung Jun Bae; Sang Hoon Chae; Thuc Hue Ly; Tae Hyung Kim; Dong Hoon Keum; Chang Kee Kim; Jun Sik Hwang; Yoon Jeong Choi; Young Hee Lee
Source:
Energy 2013 v.55 no. pp. 1143-1151
ISSN:
0360-5442
Subject:
aluminum; aluminum oxide; carbon nanotubes; energy; energy density; engineering; enthalpy; fuels; heat production; heat transfer; mixing; oxidation; temperature; thermal conductivity
Abstract:
... Aluminum powder is used for energetic materials due to high energy density. Controlling oxidation rate, oxidation temperature, and reaction enthalpy is important parameters prior to practical use. Here, we engineered static and dynamic properties of oxidation of Al particles by mixing CNTs (carbon nanotubes) having high thermal conductivity and large exothermic energy. Morphologies of Al/CNT mixtu ...
DOI:
10.1016/j.energy.2013.04.039

43. Influence of the Type of Oxygen Carriers on the Performance of a Hybrid Solar Chemical Looping Combustion System

Author:
Jafarian Mehdi; Arjomandi Maziar; Nathan Graham J.
Source:
Energy & Fuels 2014 v.28 no.5 pp. 2914-2924
ISSN:
1520-5029
Subject:
aluminum oxide; carbon monoxide; cobalt; combustion; copper; energy; energy density; ferrous oxide; heat production; hydrogen; iron; manganese; natural gas; nickel; oxygen; silica; solar energy; thermal analysis; titanium dioxide
Abstract:
... A thermal analysis of a hybrid solar chemical looping combustion (Hy-Sol-CLC) system is presented to identify the energetic performance of various combinations of fuel and oxygen carriers. Three fuels, namely, natural gas, carbon monoxide, and hydrogen, are assessed in combination with the oxides of five metals, namely, Co, Cu, Fe, Mn, and Ni as oxygen carrier. Of primary importance is the heat of ...
DOI:
10.1021/ef402542b

44. Interfacial Bonding Stabilizes Rhodium and Rhodium Oxide Nanoparticles on Layered Nb Oxide and Ta Oxide Supports

Author:
Strayer Megan E.; Binz Jason M.; Tanase Mihaela; Kamali Shahri Seyed Mehdi; Sharma Renu; Rioux Robert M.; Mallouk Thomas E.
Source:
Journal of the American Chemical Society 2014 v.136 no.15 pp. 5687-5696
ISSN:
1520-5126
Subject:
X-radiation; X-ray absorption spectroscopy; absorption; aluminum oxide; calorimetry; catalysts; chemical bonding; enthalpy; heat production; nanoparticles; nanosheets; rhodium; silica; surface area; temperature; titration; transmission electron microscopy
Abstract:
... Metal nanoparticles are commonly supported on metal oxides, but their utility as catalysts is limited by coarsening at high temperatures. Rhodium oxide and rhodium metal nanoparticles on niobate and tantalate supports are anomalously stable. To understand this, the nanoparticle–support interaction was studied by isothermal titration calorimetry (ITC), environmental transmission electron microscopy ...
DOI:
10.1021/ja412933k

45. Low-temperature exothermic reactions in fully-dense Al/MoO3 nanocomposite powders

Author:
Rayon A. Williams; Mirko Schoenitz; Alexandre Ermoline; Edward L. Dreizin
Source:
Thermochimica acta 2014 v.594 pp. 1-10
ISSN:
0040-6031
Subject:
X-ray diffraction; aluminum; aluminum oxide; cupric oxide; data collection; differential scanning calorimetry; electric field; endothermy; energy-dispersive X-ray analysis; heat production; milling; nanocomposites; oxidation; phase transition; powders; reaction mechanisms; scanning electron microscopy; temperature; thermogravimetry; weight loss
Abstract:
... Low-temperature redox reactions in nano-thermites prepared by arrested reactive milling (ARM) were described by Cabrera–Mott (CM) mechanism, in which the growth of very thin oxide layers is accelerated by an electric field induced across such layers. A reaction mechanism combining the initial CM step with following oxidation steps identified earlier for oxidation of Al and representing growth of a ...
DOI:
10.1016/j.tca.2014.08.026

46. Origin of excess heat generated during loading Pd-impregnated alumina powder with deuterium and hydrogen

Author:
O. Dmitriyeva; R. Cantwell; M. McConnell; G. Moddel
Source:
Thermochimica acta 2012 v.543 no. pp. 260-266
ISSN:
0040-6031
Subject:
aluminum oxide; deuterium; energy; gases; heat production; isotopes; nanoparticles; nuclear power
Abstract:
... We studied heat production in Pd-impregnated alumina powder in the presence of hydrogen and deuterium gases, investigating claims of anomalous heat generated as a result of nuclear fusion, usually referred to as a low energy nuclear reaction (LENR). By selecting the water isotope used to fabricate the material and then varying the gas used for loading, we were able to influence the amount of heat ...
DOI:
10.1016/j.tca.2012.05.037

47. Interfacial Chemistry in Al/CuO Reactive Nanomaterial and Its Role in Exothermic Reaction

Author:
Kwon Jinhee; Ducéré Jean Marie; Alphonse Pierre; Bahrami Mehdi; Petrantoni Marine; Veyan Jean-Francois; Tenailleau Christophe; Estève Alain; Rossi Carole; Chabal Yves J.
Source:
ACS applied materials 2013 v.5 no.3 pp. 605-613
ISSN:
1944-8252
Subject:
X-ray photoelectron spectroscopy; aluminum; aluminum oxide; chemical bonding; coatings; cupric oxide; differential scanning calorimetry; evaporation; heat production; infrared spectroscopy; nanomaterials; oxygen; reaction kinetics; temperature; transmission electron microscopy
Abstract:
... Interface layers between reactive and energetic materials in nanolaminates or nanoenergetic materials are believed to play a crucial role in the properties of nanoenergetic systems. Typically, in the case of Metastable Interstitial Composite nanolaminates, the interface layer between the metal and oxide controls the onset reaction temperature, reaction kinetics, and stability at low temperature. S ...
DOI:
10.1021/am3019405

48. Metastable nanostructured metallized fluoropolymer composites for energetics

Author:
Hannah A. Miller; Bradley S. Kusel; Seth T. Danielson; James W. Neat; Eryn K. Avjian; Scott N. Pierson; Stephen M. Budy; David W. Ball; Scott T. Iacono; Sharon C. Kettwich
Source:
Journal of materials chemistry A 2013 v.1 no.24 pp. 7050-7058
ISSN:
2050-7496
Subject:
Lewis acids; X-ray diffraction; aluminum oxide; differential scanning calorimetry; energy; epoxides; fluorides; heat production; mechanical properties; metals; models; nanocomposites; oxidants; oxidation; scanning electron microscopy; stoichiometry; surface interactions; thermal degradation; thermal properties; thermogravimetry; transmission electron microscopy
Abstract:
... Fluoropolymers have long served as potent oxidizers for metal-based pyrolant designs for the preparation of energetic materials. Commercial perfluoropolyethers (PFPEs), specifically known as Fomblins®, are well-known to undergo accelerated thermal degradation in the presence of native metals and Lewis acids producing energetically favorable metal fluoride species. This study employs the use of PFP ...
DOI:
10.1039/c3ta11603d

49. Microwave-induced substitutional-combustion reaction of Fe3O4/Al ceramic matrix porous composite

Author:
C. C. Lee; N. Yoshikawa; S. Taniguchi
Source:
Journal of materials science 2011 v.46 no.21 pp. 7004-7011
ISSN:
0022-2461
Subject:
X-ray diffraction; aluminum; aluminum oxide; ceramics; combustion; differential thermal analysis; electric furnaces; ferrous oxide; heat production; iron; iron oxides; melting; microstructure; microwave treatment; scanning electron microscopy; temperature
Abstract:
... Microwave processing and substitutional-combustion reaction have been utilized to fabricate ceramic matrix porous composite from the thermite reaction of Fe3O4/Al system. Stoichiometric and mixtures with lower and over aluminum were tested. As this system was highly exothermic, the melting of reaction products and destruction the porous structure may occur. In order to avoid that, reaction coupled ...
DOI:
10.1007/s10853-011-5669-3

50. Modelling the adsorption of mercury onto natural and aluminium pillared clays

Author:
Mabrouk Eloussaief; Ali Sdiri; Mourad Benzina
Source:
Environmental science and pollution research international 2013 v.20 no.1 pp. 469-479
ISSN:
0944-1344
Subject:
Fourier transform infrared spectroscopy; Late Cretaceous epoch; X-ray diffraction; adsorbents; adsorption; aluminum; aluminum oxide; calcium; chemical analysis; clay; enthalpy; entropy; heat production; iron; magnesium; mercury; pH; pollution; porous media; remediation; research; silica; sorption isotherms; surface area; temperature; Tunisia
Abstract:
... INTRODUCTION: The removal of heavy metals by natural adsorbent has become one of the most attractive solutions for environmental remediation. Natural clay collected from the Late Cretaceous Aleg formation, Tunisia was used as a natural adsorbent for the removal of Hg(II) in aqueous system. METHODS: Physicochemical characterization of the adsorbent was carried out with the aid of various techniques ...
DOI:
10.1007/s11356-012-0874-4

51. Novel catalyst structures with enhanced heat transfer characteristics

Author:
Min Sheng; Hongyun Yang; Donald R. Cahela; Bruce J. Tatarchuk
Source:
Journal of catalysis 2011 v.281 no.2 pp. 254-262
ISSN:
0021-9517
Subject:
aluminum oxide; catalysts; copper; foams; heat production; heat transfer; heat transfer coefficient; temperature; thermal conductivity
Abstract:
... Highly exothermic and highly endothermic reactions require catalyst beds with good heat transfer characteristics. A novel catalyst structure, microfibrous entrapped catalyst (MFEC) structure, made of high thermal conductive metals can significantly improve heat transfer efficiency, compared with traditional packed beds (PB). First, the thermal parameters of metal MFEC were determined experimentall ...
DOI:
10.1016/j.jcat.2011.05.006

52. Removal of heavy metal ions from aqueous solution using red loess as an adsorbent

Author:
Shengtao Xing; Meiqing Zhao; Zichuan Ma
Source:
Journal of environmental sciences (China) 2011 v.23 no.9 pp. 1497-1502
ISSN:
1001-0742
Subject:
X-ray diffraction; adsorbents; adsorption; aluminum oxide; aqueous solutions; copper; heat production; heavy metals; lead; loess; metal ions; models; pH; scanning electron microscopy; temperature; zinc
Abstract:
... The adsorption behaviors of heavy metals onto novel low-cost adsorbent, red loess, were investigated. Red loess was characterized by X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectra. The results indicated that red loess mainly consisted of silicate, ferric and aluminum oxides. Solution pH, adsorbent dosage, initial metal concentration, contact time and tempera ...
DOI:
10.1016/S1001-0742(10)60581-5

53. Steady-State Simulation of a Novel Annular Multitubular Reactor for Enhanced Methanol Production

Author:
Alarifi Abdulaziz; Elkamel Ali; Croiset Eric
Source:
Industrial & Engineering Chemistry Research 2013 v.52 no.44 pp. 15387-15393
ISSN:
1520-5045
Subject:
aluminum oxide; byproducts; catalysts; cupric oxide; distillation; engineering; heat production; methanol; models; profitability; synthesis gas; temperature profiles; zinc oxide
Abstract:
... In this study, a one-dimensional heterogeneous model with intraparticle diffusion limitation has been developed for methanol synthesis from syngas. The synthesis gas produced from the reformer is compressed at a pressure of 60–100 bar and then heated up to 200–250 °C in order to prepare it for the methanol production reaction. Syngas reacts on a copper oxide/zinc oxide/alumina catalyst. The annula ...
DOI:
10.1021/ie4006589

54. Quality of fluidization in gas–solid unary and packed fluidized beds: An experimental study using gamma ray transmission technique

Author:
D. Mandal; V.K. Sharma; H.J. Pant; D. Sathiyamoorthy; M. Vinjamur
Source:
Powder technology 2012 v.226 no. pp. 91-98
ISSN:
0032-5910
Subject:
aluminum oxide; fluidized beds; gamma radiation; heat production; mass transfer; silica
Abstract:
... Quality of fluidization is an important criterion for efficient heat and mass transfer in gas–solid fluidized beds. Knowledge of voidage distribution in fluidized bed is essential when exothermic reactions are carried out in fluidized beds. Quality of fluidization is often expressed in terms of time average local void-faction distribution. Gamma ray transmission technique is one of the techniques ...
DOI:
10.1016/j.powtec.2012.04.022

55. Simulation of VOCs oxidation in a catalytic nanolith

Author:
Zebao Rui; Yubing Lu; Hongbing Ji
Source:
RSC advances 2012 v.3 no.4 pp. 1103-1111
ISSN:
2046-2069
Subject:
aluminum oxide; catalytic activity; combustion; heat production; methane; models; nanopores; naphthalene; platinum; porosity; propane; propylene; temperature; volatile organic compounds
Abstract:
... Porous anodized aluminum oxide (AAO) structure consists of an assembly of identical pores having nanometer dimensions that span a flow reactor so as to produce an array of nano reactors, named as a catalytic nanolith. In order to understand the applicability of the nanolith in volatile organic compounds (VOCs) catalytic combustion and correlate the catalytic performance of the nanolith with its st ...
DOI:
10.1039/c2ra22878e

56. Effects of alternating and direct current in electrocoagulation process on the removal of fluoride from water

Author:
Vasudevan, Subramanyan; Kannan, Balasingam Suresh; Lakshmi, Jothinathan; Mohanraj, Subramanian; Sozhan, Ganapathy
Source:
Journal of chemical technology and biotechnology 2011 v.86 no.3 pp. 428-436
ISSN:
0268-2575
Subject:
adsorption; alloys; aluminum; aluminum hydroxide; aluminum oxide; corrosion; electrodes; energy; heat production; oxidation; pH; sorption isotherms; temperature
Abstract:
... BACKGROUND: When direct current (DC) is used in electrocoagulation processes, an impermeable oxide layer may form on the cathode and corrosion of the anode may occur due to oxidation. This prevents effective current transfer between the anode and cathode, so the efficiency of the electrocoagulation process declines. These disadvantages of DC have been reduced by adopting alternating current (AC). ...
DOI:
10.1002/jctb.2534

57. The influence of combustion synthesis conditions on the α-Al2O3 powder preparation

Author:
Robert Ianoş; Ioan Lazău; Cornelia Păcurariu
Source:
Journal of materials science 2009 v.44 no.4 pp. 1016-1023
ISSN:
0022-2461
Subject:
aluminum; aluminum oxide; combustion; ethanolamine; fuels; heat production; hydrolysis; nitrates; powders; reaction mechanisms; surface area; thermal analysis; urea
Abstract:
... Fuel type and fuel/aluminium nitrate molar ratio proved to be of great importance during the preparation of α-Al₂O₃ powders. A stoichiometric amount of urea (U) enabled the formation of α-Al₂O₃ with a surface area of 24 m²/g directly from the combustion reaction. Monoethanolamine, triethylenetetramine, trishydroxymethylaminomethane, and triethanolamine yield amorphous powders. This behaviour was e ...
DOI:
10.1007/s10853-008-3226-5

58. Reaction study of various mixtures of tetra ethyl ortho silicate and aluminum nitrate

Author:
Akshoy Kr. Chakraborty
Source:
Journal of materials science 2008 v.43 no.15 pp. 5376-5384
ISSN:
0022-2461
Subject:
aluminum; aluminum oxide; gels; heat production; hydrolysis; nitrates; silicon
Abstract:
... Several studies on the formation of amorphous aluminosilicate phase during heating slow hydrolysis (SH) or Type 1 mullite gel prior to formation of 2:1 mullite is briefly reviewed. Tetra ethyl ortho silicate (TEOS) and aluminum nitrate nonahydrate (ANN) are isothermally heated on water bath at 80 °C. It has been shown that these react in an exothermic manner. The resultant isothermally heated gel ...
DOI:
10.1007/s10853-008-2780-1

59. Susceptibility of a heterogeneous catalyst, Rh/γ-alumina, to rapid structural change by exposure to NO

Author:
Tom Campbell; Andrew J. Dent; Sofia Diaz-Moreno; John Evans; Steven G. Fiddy; Mark A. Newton; Sandra Turin
Source:
Chemical communications 2002 v. no.4 pp. 304-305
ISSN:
1364-548X
Subject:
aluminum oxide; catalysts; chemical reactions; heat production; nitric oxide; particle size; rhodium
Abstract:
... Metal particles in a Rh/γ-Al₂O₃ catalyst of differing particle size are oxidised by NO/He within 5 seconds at 313 K; rapid, highly exothermic dissociative chemisorption of NO is the initial step. ...
DOI:
10.1039/b106846f

60. Synthesis of Al2O3 matrix composites by reactive infiltration

Author:
M Kobashi; T Choh
Source:
Journal of materials science 1997 v.32 no.23 pp. 6279-6282
ISSN:
0022-2461
Subject:
aluminum; aluminum oxide; heat production; nickel oxide; temperature
Abstract:
... Reactive infiltration of a NiO-base blended powder with molten aluminium was attempted at 1673 K in order to obtain Al2O3 matrix composites containing a dispersion of Al3Ni, AlNi and/or AlNi3. The NiO powder was barely infiltrated by the molten aluminium after a 3600 s holding time at 1673 K. A continuous layer of Al2O3 was observed to exist at the infiltration front, which prevented any further i ...
DOI:
10.1023/A:1018645329245

61. Effect of the Sol-Gel Transformation in Clay-Water Systems on Biological Activity: I. Seed Germination and Bacterial Thermogenesis

Author:
K. W. Lee; B. G. Davey; P. F. Low
Source:
Soil Science Society of America journal 1970 v.34 no.1 pp. 45-49
ISSN:
0361-5995
Subject:
Enterococcus faecalis; Lactuca sativa; aluminum oxide; bacteria; bioactive properties; calorimeters; calorimetry; clay; gels; heat production; lettuce; seed germination; seeds; sodium
Abstract:
... Gels containing 4, 6 and 8% Na- or Na/Al-clay (Na-clay with hydrous aluminum oxide impurity) were extruded through a 20-gauge hypodermic needle into petri dishes. Half of the petri dishes were tapped on the laboratory bench to disturb the gels within them. Then all of the gel surfaces were smoothed with a spatula and lettuce (Lactuca sativa L.) seeds were placed on them. It was found that the lett ...
DOI:
10.2136/sssaj1970.03615995003400010016x