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You searched for: Subject term catalysts Remove constraint Subject term: catalysts Subject term aluminum oxide Remove constraint Subject term: aluminum oxide Subject term heat production Remove constraint Subject term: heat production Text availability Citation in PubAg Remove constraint Text availability: Citation in PubAg
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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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