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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 nitric oxide Remove constraint Subject term: nitric oxide
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1. Vibration, acoustic and emission characteristics of the chlorella vulgaris microalgae oil in compression ignition engine to mitigate environmental pollution

Author:
M. Sangeetha; P. Boomadevi; Amany Salah Khalifa; Kathirvel Brindhadevi; Manigandan Sekar
Source:
Chemosphere 2022 v.293 pp. 133475
ISSN:
0045-6535
Subject:
Chlorella vulgaris; acoustics; aluminum oxide; biodiesel; carbon dioxide; carbon nanotubes; catalysts; combustion; diesel engines; greenhouse gases; microalgae; nitric oxide; oils; petroleum; pollution; prices; vibration
Abstract:
... The petroleum fuel demand with high price and its exhaustion imposes a pressure to find an alternative. The fossil fuel shortage has been deteriorating over the past few years, because of the rapid increase in population. Many attempts have been made to increase the quality of biofuel with additives. In this paper, two types of nanoparticles such as carbon nanotubes (CNT) and alumina (Al₂O₃) in ch ...
DOI:
10.1016/j.chemosphere.2021.133475

2. Artificial neural network modeling of performance, emission, and vibration of a CI engine using alumina nano-catalyst added to diesel-biodiesel blends

Author:
Seyyed Hassan Hosseini; Ahmad Taghizadeh-Alisaraei; Barat Ghobadian; Ahmad Abbaszadeh-Mayvan
Source:
Renewable energy 2020 v.149 pp. 951-961
ISSN:
0960-1481
Subject:
algorithms; aluminum oxide; atmospheric pressure; carbon dioxide; carbon monoxide; catalysts; emissions; energy use and consumption; fuels; gases; hydrocarbons; nanomaterials; neural networks; nitric oxide; oils; oxygen; relative humidity; renewable energy sources; statistical analysis; temperature; torque; vibration; viscosity
Abstract:
... In recent years, added nano-catalysts to fuels has improved their thermo-physical properties. In present study, the alumina as additive with concentrations of 30, 60, and 90 ppm were added to B5 and B10 blends for evaluation of the engine performance, emissions, and vibration levels. An ANN model based on standard back-propagation learning algorithm for the engine was developed. Multi-layer percep ...
DOI:
10.1016/j.renene.2019.10.080

3. Characterization of Pt-based oxidation catalyst – Deactivated simultaneously by sulfur and phosphorus

Author:
Mari Honkanen; Mika Huuhtanen; Marja Kärkkäinen; Tomi Kanerva; Kimmo Lahtonen; Ari Väliheikki; Kauko Kallinen; Riitta L. Keiski; Minnamari Vippola
Source:
Journal of catalysis 2021 v.397 pp. 183-191
ISSN:
0021-9517
Subject:
adsorption; aluminum oxide; aluminum phosphate; carbon monoxide; catalysts; catalytic activity; cerium; nitric oxide; oxidation; phosphorus; platinum; propylene; sulfur; temperature
Abstract:
... Simultaneous poisoning of sulfur + phosphorus on a platinum-based diesel oxidation catalyst was studied to gain a deeper understanding on the catalyst deactivation. Compared to a single poisoning (sulfur or phosphorus), the simultaneous poisoning had a severe effect on the catalyst activation: light-off temperature for 90% conversion of propene was not reached, this of carbon monoxide was much hig ...
DOI:
10.1016/j.jcat.2021.03.026

4. Mechanism of nitrite hydrogenation over Pd/γ-Al2O3 according a rigorous kinetic study

Author:
Pengyu Xu; Shilpa Agarwal; Leon Lefferts
Source:
Journal of catalysis 2020 v.383 pp. 124-134
ISSN:
0021-9517
Subject:
adsorption; aluminum oxide; ammonia; atmospheric pressure; carbon dioxide; catalysts; chemical bonding; dimerization; hydrogen; hydrogenation; mass transfer; nitric oxide; nitrites; nitrogen; pH; palladium; slurries
Abstract:
... The kinetics of nitrite hydrogenation over a Pd/γ-Al₂O₃ catalyst was studied in a semi-batch slurry reactor at atmospheric pressure, in absence of any mass transfer effects. The hydrogen concentration and pH were kept constant during an experiment by continuously flowing a gas mixture containing hydrogen and 10% v/v CO₂. The kinetic experiments were performed in an unprecedented wide concentration ...
DOI:
10.1016/j.jcat.2020.01.003

5. Catalytic effects of CaO, Al2O3, Fe2O3, and red mud on Pteris vittata combustion: Emission, kinetic and ash conversion patterns

Author:
Yueyao Song; Jinwen Hu; Jingyong Liu; Fatih Evrendilek; Musa Buyukada
Source:
Journal of cleaner production 2020 v.252 pp. 119646
ISSN:
0959-6526
Subject:
Fourier transform infrared spectroscopy; Pteris vittata; X-ray fluorescence spectroscopy; activation energy; aluminum; aluminum oxide; biomass; calcium oxide; carbon dioxide; catalysts; catalytic activity; combustion; emissions; enthalpy; ferric oxide; fluorescence; fouling; heat transfer; hydrogen cyanide; melting; nitric oxide; risk reduction; sulfur dioxide; thermogravimetry
Abstract:
... Catalytic effects of red mud (RM), calcium oxide (CaO), aluminum trioxide (Al₂O₃), and ferric oxide (Fe₂O₃) were quantified on the combustion, emission and ash characteristics of aboveground (PA) and belowground (PB) biomass of Pteris vittata using thermogravimetric, Fourier transform infrared, X-ray fluorescence and FactSage analyses. CaO affected the specific formation pathways of tar species an ...
DOI:
10.1016/j.jclepro.2019.119646

6. Investigation of the common intermediates over Fe-ZSM-5 in NH3-SCR reaction at low temperature by in situ DRIFTS

Author:
Xiaoyan Shi; Yingjie Wang; Yulong Shan; Yunbo Yu; Hong He
Source:
Journal of environmental sciences (China) 2020 v.94 pp. 32-39
ISSN:
1001-0742
Subject:
Bronsted acids; Fourier transform infrared spectroscopy; Lewis acids; aluminum oxide; ammonia; ammonium; catalysts; iron; nitrates; nitric oxide; nitrites; nitrogen dioxide; oxidation; oxygen; silica; temperature
Abstract:
... The surface species formed in the reaction of NO and NO₂ with pre-adsorbed NH₃ over a Fe-ZSM-5 catalyst (1.27 wt.% Fe, SiO₂/Al₂O₃ = 25) at low temperature (140°C) were studied by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Through using a background spectrum of NH₃-saturated Fe-ZSM-5, we clearly observed the formation of common intermediates resulting from the rea ...
DOI:
10.1016/j.jes.2020.02.029

7. Mechanistic insight into the methanol selective catalytic reduction of NO reaction over Cu-containing perovskites

Author:
Hao Wang; Runduo Zhang; Peixin Li; Sébastien Royer; Jean-Philippe Dacquin
Source:
Journal of catalysis 2019 v.377 pp. 480-493
ISSN:
0021-9517
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; aluminum oxide; catalysts; catalytic activity; copper; density functional theory; desorption; grinding; hydrogen; iron; methanol; nitrates; nitric oxide; nitrites; physicochemical properties; reaction mechanisms; silver; temperature
Abstract:
... The selective catalytic reduction (SCR) of NO by methanol was studied on LaFe0.8Cu0.2O3, and compared with that on an Ag/Al2O3 reference catalyst. A detailed characterization of the catalyst’s physicochemical properties was carried out by X-ray diffraction, N2 physisorption, H2 temperature-programmed reduction, isotopic exchange experiments, NOads + O2ads temperature-programmed desorption, and X-r ...
DOI:
10.1016/j.jcat.2019.07.035

8. NOx adsorption and desorption of a Mn-incorporated NSR catalyst Pt/Ba/Ce/xMn/γ-Al2O3

Author:
Pan Wang; Dan Yu; Gang Wu; Farhan Sheikh; Junheng Liu
Source:
Environmental science and pollution research international 2019 v.26 no.27 pp. 27888-27896
ISSN:
0944-1344
Subject:
adsorption; aluminum oxide; barium; catalysts; desorption; manganese; nitrates; nitric oxide; nitrites; nitrogen dioxide; oxygen; platinum; pollution; temperature; thermal stability
Abstract:
... This study evaluated the NOₓ adsorption and desorption performance as well as the casual relationship underlying a Mn-incorporated catalyst (Pt/Ba/Ce/xMn/γ-Al₂O₃). NOₓ adsorption and desorption are regarded as a prominent index for the NOₓ removal performance of NOₓ storage and reduction; we utilized NOₓ storage experiments with various inlet NO and O₂ concentrations and cycling adsorption/desorpt ...
DOI:
10.1007/s11356-019-05847-y

9. Size effect of Pt nanoparticles in acid-assisted soot oxidation in the presence of NO

Author:
Shuting Luo; Xiaodong Wu; Baofang Jin; Shuang Liu; Rui Ran; Zhichun Si; Duan Weng
Source:
Journal of environmental sciences (China) 2020 v.94 pp. 64-71
ISSN:
1001-0742
Subject:
X-ray diffraction; aluminum oxide; ammonia; carbon monoxide; catalysts; catalytic activity; chemical reduction; desorption; nanoparticles; nitric oxide; nitrogen dioxide; oxidation; oxygen; particle size; platinum; soot; spectroscopy; sulfuric acid; thermogravimetry; transmission electron microscopy
Abstract:
... Pt/Al₂O₃ catalysts with mean Pt particle size ranged from 2.7 to 7.1 nm were synthesized by chemical reduction method, and the sulfated counterparts were prepared by impregnation of sulfuric acid. The turnover frequency of platinum for soot oxidation under loose contact conditions in a feed flow containing NO and O₂ are positively correlated with the size of platinum. The sulfated Pt/Al₂O₃ exhibit ...
DOI:
10.1016/j.jes.2020.04.008

10. Superior activity of iron–manganese supported on kaolin for NO abatement at low temperature

Author:
Xiaobo Wang; Jie Zhou; Tong Zhao; Keting Gui; Jia Wang; Hywel R. Thomas
Source:
Journal of environmental sciences (China) 2020 v.88 pp. 237-247
ISSN:
1001-0742
Subject:
Bronsted acids; X-ray diffraction; X-ray photoelectron spectroscopy; aluminum oxide; atomic absorption spectrometry; catalysts; catalytic activity; desorption; diatomaceous earth; energy-dispersive X-ray analysis; iron; kaolin; manganese; nitric oxide; scanning electron microscopy; temperature; thermogravimetry
Abstract:
... A series of Fe–Mn catalysts was prepared using different supports (kaolin, diatomite, and alumina) and used for NO abatement via low-temperature NH3-selective catalytic reduction (SCR). The results showed that 12Fe–10Mn/Kaolin (with the concentration of Fe and Mn 12 and 10wt.%, respectively) exhibited the highest activity, and more than 95.8% NO conversion could be obtained within the wide tempera ...
DOI:
10.1016/j.jes.2019.08.017

11. DFT Analysis of the Reaction Mechanism for NH₃-SCR of NOₓ over Mn/γ-Al₂O₃ Catalyst

Author:
Xin Li; Quan Li; Liu Zhong; Zijian Song; Shenghui Yu; Cheng Zhang; Qingyan Fang; Gang Chen
Source:
Journal of physical chemistry 2019 v.123 no.41 pp. 25185-25196
ISSN:
1932-7455
Subject:
Bronsted acids; Lewis acids; aluminum oxide; ammonia; ammonium; catalysts; dehydrogenation; density functional theory; desorption; energy; manganese; nitric oxide; nitrogen; nitrogen dioxide; nitrous oxide; oxidation; oxygen; reaction mechanisms
Abstract:
... The SCR reaction mechanism on the Mn/γ-Al₂O₃ catalyst was studied using density functional theory. The intermediates, energy barriers, and rate-determining steps of N₂, NO₂, and N₂O formation were calculated. It was found that NH₃ could be adsorbed on the Lewis acid sites and participated in the SCR reaction in the form of coordinated NH₃. In addition, NH₃ could also be adsorbed on the Brønsted ac ...
DOI:
10.1021/acs.jpcc.9b06499

12. Effect of Thermal Aging on Local Structure and Three-Way Catalysis of Cu/Al₂O₃

Author:
Hiroshi Yoshida; Taiki Hirakawa; Haruka Oyama; Ren Nakashima; Satoshi Hinokuma; Masato Machida
Source:
Journal of physical chemistry 2019 v.123 no.16 pp. 10469-10476
ISSN:
1932-7455
Subject:
aluminum oxide; catalysts; catalytic activity; copper; cupric oxide; nitric oxide; physical chemistry; surface area; temperature
Abstract:
... Cu supported on Al₂O₃, prepared by impregnation, was thermally aged at different temperatures, and the influence of thermal aging on the local structure, redox behavior of Cu, and catalytic activity for a stoichiometric NO–CO–C₃H₆–O₂ reaction was investigated. Crystalline CuO was mainly formed on Al₂O₃ after thermal aging at ≤700 °C, whereas aging at higher temperatures induced Cu²⁺ incorporation ...
DOI:
10.1021/acs.jpcc.9b01848

13. Effect of alumina and zirconia as binders on the activity of Fe-BEA for NH3-SCR of NO

Author:
Jin Shi; Zihao Zhang; Mingxia Chen; Zhixiang Zhang; Wenfeng Shangguan; Shunchao Gu; Hirano Shin-ichi
Source:
Frontiers of environmental science & engineering 2018 v.12 no.1 pp. 15
ISSN:
2095-2201
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; aluminum oxide; catalysts; catalytic activity; industrial applications; iron; nitric oxide; oxidation; scanning electron microscopy; temperature
Abstract:
... Fe-BEA catalysts are active for the NH3-SCR of NO. For industrial application, a binder should be added to the Fe-BEA catalysts to make them tightly adhere to the monoliths. The addition of alumina and zirconia as binders to the Fe-BEA led to a different effect on NO conversion. The catalytic activity of the mixed samples was evaluated by the temperature programmed procedure in a flow-reactor syst ...
DOI:
10.1007/s11783-018-1012-4

14. Fe₂O₃–CeO₂@Al₂O₃ Nanoarrays on Al-Mesh as SO₂-Tolerant Monolith Catalysts for NOₓ Reduction by NH₃

Author:
Lupeng Han; Min Gao; Chong Feng; Liyi Shi; Dengsong Zhang
Source:
Environmental science & technology 2019 v.53 no.10 pp. 5946-5956
ISSN:
1520-5851
Subject:
active oxygen species; aluminum oxide; ammonia; ammonium; catalysts; ceric oxide; ferric oxide; iron; nitrates; nitric oxide; nitrites; nitrogen; oxidation; oxygen; steam; sulfates; sulfur dioxide; temperature
Abstract:
... Currently, selective catalytic reduction of NOₓ with NH₃ in the presence of SO₂ is still challenging at low temperatures (<300 °C). In this study, enhanced NOₓ reduction was achieved over a SO₂-tolerant Fe-based monolith catalyst, which was originally developed through in situ construction of Al₂O₃ nanoarrays (na-Al₂O₃) on the monolithic Al-mesh by a steam oxidation method followed by anchoring Fe ...
DOI:
10.1021/acs.est.9b01217

15. Impact of Preparation Method and Hydrothermal Aging on Particle Size Distribution of Pt/γ-Al₂O₃ and Its Performance in CO and NO Oxidation

Author:
E. Ogel; M. Casapu; D. E. Doronkin; R. Popescu; H. Störmer; C. Mechler; G. Marzun; S. Barcikowski; M. Türk; J.-D. Grunwaldt
Source:
Journal of physical chemistry 2019 v.123 no.9 pp. 5433-5446
ISSN:
1932-7455
Subject:
X-ray absorption spectroscopy; X-ray diffraction; aluminum oxide; carbon monoxide; catalysts; catalytic activity; chlorine; liquids; nanoparticles; nitric oxide; nitrogen; oxidation; particle size distribution; physical chemistry; pyrolysis; temperature; thermal stability; transmission electron microscopy
Abstract:
... The influence of the preparation method and the corresponding particle size distribution on the hydrothermal deactivation behavior at 600–800 °C and performance during CO/NO oxidation was systematically investigated for a series of Pt/Al₂O₃ catalysts. Representative conventional (incipient wetness impregnation) and advanced preparation methods (flame spray pyrolysis, supercritical fluid reactive d ...
DOI:
10.1021/acs.jpcc.8b11065

16. Insights into the precursor effect on the surface structure of γ-Al2O3 and NO + CO catalytic performance of CO-pretreated CuO/MnOx/γ-Al2O3 catalysts

Author:
Xiuwen Wang; Yiyang Lu; Wei Tan; Annai Liu; Jiawei Ji; Haiqin Wan; Chuanzhi Sun; Changjin Tang; Lin Dong
Source:
Journal of colloid and interface science 2019 v.554 pp. 611-618
ISSN:
0021-9797
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; acetates; aluminum oxide; carbon monoxide; catalysts; catalytic activity; copper; cupric oxide; dissociation; manganese; manganese monoxide; nitrates; nitric oxide
Abstract:
... NO reduction by CO was investigated over CO-pretreated CuO/MnOx/γ-Al2O3 catalysts with different metal precursors (nitrate and acetate). It was found that the catalyst prepared from acetate salts (Cu/Mn/Al-A) exhibited significantly higher activity than counterpart catalyst from nitrate precursors (Cu/Mn/Al-N). XRD, XPS and in situ DRIFT were carried out to approach the nature for the different ca ...
DOI:
10.1016/j.jcis.2019.07.039

17. Metal Oxides as Catalysts and Adsorbents in Ozone Oxidation of NOₓ

Author:
Kalev Erme; Indrek Jõgi
Source:
Environmental science & technology 2019 v.53 no.9 pp. 5266-5271
ISSN:
1520-5851
Subject:
adsorbents; adsorption; aluminum oxide; catalysts; ferric oxide; fuel combustion; gases; nitric oxide; nitrogen; oxygen; ozone; pollutants; powders; temperature; titanium dioxide
Abstract:
... NOₓ represents an important group of pollutants that are formed in fuel combustion. As these pollutants cause significant environmental problems, removal of NOₓ from exhaust gases is necessary. The present study investigated the influence of metal oxide powders on the removal of NOₓ by oxidation with ozone. The aim of the study was to compare the catalytic effect of TiO₂, Al₂O₃, and Fe₂O₃ and to i ...
DOI:
10.1021/acs.est.8b07307

18. NO oxidation over Fe-based catalysts supported on montmorillonite K10, γ-alumina and ZSM-5 with gas-phase H2O2

Author:
Rongji Cui; Suxia Ma; Jie Wang; Shujun Sun
Source:
Chemosphere 2019 v.234 pp. 302-309
ISSN:
0045-6535
Subject:
Bronsted acids; aluminum oxide; catalysts; electron transfer; ferric oxide; gases; hydrogen peroxide; hydroxyl radicals; iron; montmorillonite; nitric oxide; oxidation; reaction mechanisms
Abstract:
... The catalytic gas-phase H₂O₂ oxidation of NO was achieved over Fe-based catalysts supported on montmorillonite K10, γ-alumina and ZSM-5. ESR tests illustrate that the three catalysts can catalyze decomposition of H₂O₂ yielding highly reactive hydroxyl radicals, of which Fe/K10 has the fastest rate, followed by Fe/γ-alumina. Fe³⁺ in Fe/K10 and Fe/γ-alumina show lower density of electron cloud due t ...
DOI:
10.1016/j.chemosphere.2019.06.029

19. NOₓ Oxidation and Storage Properties of a Ruddlesden–Popper-Type Sr₃Fe₂O₇₋δ-Layered Perovskite Catalyst

Author:
Kazuki Tamai; Saburo Hosokawa; Hiroshi Okamoto; Hiroyuki Asakura; Kentaro Teramura; Tsunehiro Tanaka
Source:
ACS applied materials & interfaces 2019 v.11 no.30 pp. 26985-26993
ISSN:
1944-8252
Subject:
adsorption; aluminum oxide; automobiles; barium; carbon dioxide; catalysts; desorption; heat tolerance; hydrogen; nitric oxide; oxidation; oxygen; palladium; platinum; reducing agents; reflectance; sulfur oxides; temperature
Abstract:
... The development of NOₓ-trapping catalysts for automobiles is highly desired to meet the current strict exhaust emission regulations. This study demonstrates that NOₓ oxidation and storage reactions proceed over Pt-free Sr₃Fe₂O₇₋δ with a Ruddlesden–Popper-type layered perovskite structure. Two types of Sr–Fe perovskite with oxygen storage capacity, namely, SrFeO₃₋δ and Sr₃Fe₂O₇₋δ, are studied as NO ...
DOI:
10.1021/acsami.9b08139

20. Non‐thermal plasma‐assisted catalytic oxidation of NO in a dielectric barrier discharge reactor packed with MOx/Al2O3 (M = Mn or Co) as catalysts

Author:
Jiangen Wang; Honghong Yi; Xiaolong Tang
Source:
Journal of chemical technology and biotechnology 2019 v.94 no.10 pp. 3180-3189
ISSN:
0268-2575
Subject:
Fourier transform infrared spectroscopy; aluminum oxide; catalysts; catalytic activity; chemical interactions; cobalt; cobalt oxide; desorption; energy density; manganese; manganese oxides; nitrates; nitric oxide; nitrogen dioxide; nitrous oxide; oxidation; value added
Abstract:
... BACKGROUND: Plasma catalysis has emerged as a powerful tool in converting a gas or gas mixture into other value‐added or environment‐friendly chemicals. However, a substantial research effort is needed to further understand the physical and chemical interactions between plasma and catalysts, and their contribution to the chemical reactions. RESULTS: For a given energy density (ED) of 535 ± 25 J L⁻ ...
DOI:
10.1002/jctb.6125