Synthesis, characterisation, and CO oxidation activity of M/Al2O3 meso phase catalysts (M=Ce, V, Cu)

Renuka, N.K.; Shijina, A.V.; Praveen, Anchupogu

doi:10.1016/j.matlet.2013.09.073

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Pierron et al [74] and Luo et al [75] obtained a CO conversion of 50% at around 270 • C (reaction conditions: 4.8 vol% CO in air) and 250 • C (reaction conditions: 2.4 vol% CO and 1.2 vol% O 2 in N 2 ), using 10 wt% Cu−Al 2 O 3 catalysts prepared by wet impregnation. Renuka et al [76] used wet impregnation method to prepare 11 wt% Cu supported mesoporous alumina catalyst. Their results showed that the conversion of CO reached 100% at around 300 • C. The presence of reduced cationic species of Cu and metallic copper atoms induces a beneficial effect on CO oxidation.…”

Section: Comparison Of the Catalyst Performances With Similar Materiamentioning

confidence: 99%

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

et al. 2020

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Three series of binary metal oxide catalysts containing Ni, Cu, or Co oxides were prepared, fully characterized and tested in CO oxidation. The catalysts, with a constant transition metal loading of 10 wt%, were prepared from metal nitrates and urea mixtures by a microwave-assisted solution combustion method. The RV/OV ratio, corresponding to the stoichiometry of the reactants, calculated from their elemental oxidizing and reducing valences, was varied. In order to modify the redox character of the synthesis medium from the quantity of urea; an excess of urea was used for attaining reducing conditions, while a deficit of urea shifted the medium to oxidizing conditions. Three RV/OV ratios (0.9, 1.0, and 1.1) were selected to elaborate the different binary metal oxide catalysts, nine oxide catalysts were synthesized. Then, the influence of the stoichiometry (RV/OV ratio) on the bulk and surface properties of the binary metal oxide catalysts was investigated. Similarly, the influence of the RV/OV ratio on the CO oxidation activity was discussed and the optimal value of RV/OV ratio was identified. The results show that the increasing of the RV/OV ratio from 0.9 to 1.1, particularly in Ni- and Co-containing catalysts, induces stronger metal-aluminum interactions, in the form of aluminates phases, and that are correlated to the dramatic reduction of the CO oxidation activity. The best physicochemical properties and highest catalytic activities were achieved with the catalysts prepared in redox systems stoichiometrically balanced (RV/OV = 1). The Cu-containing catalysts presented the best catalytic activities in CO oxidation.

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Section: Comparison Of the Catalyst Performances With Similar Materiamentioning

confidence: 99%

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

et al. 2020

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“…A Figura 2 apresenta os espectros de DRX dos catalisadores. Nota-se a presença de picos característicos da γ-Al2O3 em 37,6, 45,8 e 67,0° (Meng et al, 2014;Renuka;Shijina;Praveen, 2013). Por outro lado, a δ-Al2O3 foi identificada pelos picos: 25,5, 35,0, 45,1 e 67,0° (Kim;Lee, 2013).…”

Section: Caracterização Dos Catalisadoresunclassified

OXIDESIDRATAÇÃO DO GLICEROL EM FASE GASOSA UTILIZANDO A ZEÓLITA ZSM-5 E ÓXIDOS DE V E Mo SUPORTADOS EM ALUMINA

Altino¹,

Bezerra²,

Soares³

2018

Blucher Chemical Engineering Proceedings

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RESUMO-A produção de biodiesel através da transesterificação de óleos tem causado excedentes de glicerol. Contudo, o mesmo apresenta grande potencial de transformação em produtos de alto valor agregado, como o ácido acrílico e acético, através da reação de desidratação seguida de oxidação. Este trabalho teve o objetivo de preparar e caracterizar óxidos simples e mistos de V e Mo mássicos ou suportados em alumina, por impregnação seca, e utilizar os mesmos em associação com a zeólita comercial ZSM-5, na reação de oxidesidratação do glicerol em um reator com dois leitos. Caracterizaram-se os materiais por Difração de Raios X, Fisiossorção de N2 e Espectroscopia UV-Vis. As reações foram realizadas com fluxo de ar sintético, solução aquosa 30% de glicerol, razão molar glicerol/O2 = 1:1, 300°C, pressão atmosférica, e relação mássica ZSM-5 e catalisador oxidativo: 0,0 a 1,0 g e 0,0 a 1,0 g. Foi possível identificar as fases γ-Al2O3, δ-Al2O3, MoO3 e V2O5 para os catalisadores mássicos além da V2MoO8 para o misto. Os testes catalíticos revelaram que a diminuição do WHSV para a ZSM-5 resultou em uma menor desativação. O sistema ZSM-5 seguida do óxido misto, proporcionou um aumento e proximidade das conversões de glicerol e O2, todavia a rápida desativação do primeiro leito, aliada a baixa dispersão dos óxidos de vanádio na alumina, resultou em rendimentos quase nulos para ácido acrílico e acético.

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Mechanism of carbon monoxide oxidation on supported copper catalysts modified with cerium and platinum

Lộc¹,

Tri²,

Cuong³

et al. 2015

Kinet Catal

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Synthesis, characterisation, and CO oxidation activity of M/Al2O3 meso phase catalysts (M=Ce, V, Cu)

Cited by 3 publications

References 19 publications

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

OXIDESIDRATAÇÃO DO GLICEROL EM FASE GASOSA UTILIZANDO A ZEÓLITA ZSM-5 E ÓXIDOS DE V E Mo SUPORTADOS EM ALUMINA

Mechanism of carbon monoxide oxidation on supported copper catalysts modified with cerium and platinum

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