Effect of copper oxide on the catalytic activity of iron-chromia catalyst for water gas shift reaction

Idakiev, V.; Mihajlova, D.; Kunev, B.; Andreev, A.

doi:10.1007/bf02066710

Cited by 41 publications

(33 citation statements)

References 3 publications

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“…Another is replacing chromium with non-toxic elements. Idakiev et al [13] doped copper to iron-chromium catalyst using coprecipitation. They reported that the catalyst was active at low temperatures less than 573 K by doping CuO.…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Potassium and Palladium over Iron-Based Catalyst for Low Temperature Water–Gas Shift Reaction

et al. 2010

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We investigated the effect of loading potassium over iron-based catalysts for water-gas shift (WGS) reaction at 573 K. The iron-based water-gas shift catalyst has been known as a redox-mechanism catalyst. Therefore, to promote the redox reaction over iron oxide, we impregnated a small amount of Pd on various iron oxides. Results revealed that coexisting potassium and palladium accelerated the WGS reaction over iron-oxide catalyst. We examined the optimum amount of potassium over Pd/iron catalyst, and we found that the optimum molar ratio was about 2 (K/Pd molar ratio). From the viewpoint of reducibility of the catalyst, the addition of small amount of Pd onto iron oxide promotes reduction from Fe 2 O 3 to Fe 3 O 4 . However, impregnation of potassium on iron oxide makes the catalyst structure robust. The promotion effect of Pd and potassium was not observed on SiO 2 support. We therefore concluded that the synergetic effect among Pd, K, and iron oxide, was important for the WGS reaction.

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Section: Introductionmentioning

confidence: 99%

Effect of Loading Potassium and Palladium over Iron-Based Catalyst for Low Temperature Water–Gas Shift Reaction

et al. 2010

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“…The role of chromium was also considered; it is believed to increase the surface area of the solids preventing sintering and thus increasing their life [1][2][3] . On the other hand, there are few works in the open literature about the copper and chromium-doped iron oxides, as HTS catalysts, despite their commercial importance 7,8 . Considering these aspects, this work describes a method of preparation to produce this catalyst in the active form, in order to avoid the reduction step before the HTS reaction; this procedure offers the possibility of increasing the life of the catalyst as well as the process efficiency due to the energy saved.…”

Section: Introductionmentioning

confidence: 99%

Chromium and Copper-Doped Magnetite Catalysts for the High Temperature Shift Reaction

Quadro¹,

Dias²,

Amorim³

et al. 1999

J. Braz. Chem. Soc.

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Foi obtida magnetita pura e dopada com cromo e cobre, visando produzir catalisadores, na fase ativa, destinados à conversão de monóxido a dióxido de carbono a altas temperaturas (reação de HTS). As amostras foram preparadas por aquecimento do hidroxoacetato de misto ferro (III), IHA, na faixa de 150-400 °C, e caracterizados por análise química, difração de raios-X, análise térmica (DSC e TG), espectroscopia no infravermelho, medidas de área específica, microscopia eletrônica de varredura e microssonda eletrônica de raios X. Observou-se que a presença do cobre favorece a formação da magnetita mas não afeta a cristalinidade dos sólidos, de modo significativo. Ambos os dopantes melhoram o desempenho dos catalisadores: o cromo atua como estabilizador, enquanto o cobre aumenta a atividade intrínseca. Entretanto, este último favorece a sinterização, levando à formação de sólidos com baixas áreas superficiais. O efeito sinérgico desses dopantes é aumentar a atividade catalítica e a área superficial dos sólidos.Copper and chromium-doped magnetite was prepared to be used as catalysts, in the active phase, in the high temperature shift (HTS) reaction. Samples were produced by heating a mixed hydrate ferric oxyhydroxide (IHA) in the range of 150-400 °C and characterized by means of chemical analysis, X-ray diffraction, thermal analysis (DSC and TG), infrared spectroscopy, surface area measurements, scanning electron microscopy and X-ray microanalysis. It was found that copper favors magnetite formation but does not affect significantly the crystallinity of the solids. Both chromium and copper improve the performance of the catalysts towards the HTS reaction: chromium acts as a stabilizer whereas copper increases the intrinsic activity. However, copper favors sinterization leading to solids with low surface areas. The increase in the catalytic activity and in the surface area of the solids reflects the synergy of these dopants.

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“…Observou-se que, com os sólidos parcialmente substituídos, o valor da atividade aumentou com o teor de cobre. Isto pode ser atribuído à atividade catalítica do cobre na reação de WGSR, como observado em outros trabalhos [6,8,26]. A presença simultânea de níquel e cobre em quantidades equivalentes (Amostra LaNi 0,5 Cu 0,5 O 3 ) aumenta a atividade catalítica do sólido.…”

Section: Resultsunclassified

Síntese e caracterização de perovskitas do tipo LaNi1-xCu xO3 para a purificação de hidrogênio para PaCOS

Moura¹,

Silva²,

Rangel³

et al. 2010

Matéria (Rio J.)

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RESUMONeste trabalho, foram estudados sólidos do tipo LaNi1-xCuxO3 (x = 0,0; 0,3 e 0,5), com estrutura perovskita, visando a desenvolver catalisadores destinados à produção de hidrogênio de alta pureza na reforma interna de células a combustível de óxido sólido (SOFC). Observou-se que as condições experimentais usadas na preparação favoreceram a incorporação quantitativa dos cátions ao precursor e a formação dos sólidos com estrutura perovskita. Esses materiais mostraram diferentes propriedades redutoras e a presença do cobre favoreceu a estabilidade da estrutura perovskita. As propriedades catalíticas das amostras obtidas foram avaliadas na reação de deslocamento de monóxido de carbono com vapor d`água (WGSR, water gas shift reaction), uma etapa importante de purificação do hidrogênio, no processo de reforma de hidrocarbonetos. Os resultados mostraram que os catalisadores são promissores para esta reação, apresentando atividade muito superior à de um catalisador comercial de óxido de ferro contendo cromo e cobre; isto foi atribuído à tendência das amostras em favorecer o mecanismo adsortivo, provavelmente decorrente de uma alta mobilidade dos oxigênios da rede cristalina. O valor mais elevado de atividade catalítica foi apresentado pela Amostra LaNi0,5Cu0,5O3, considerada o catalisador de melhor desempenho.Palavras-chave: Perovskita, produção de hidrogênio, conversão de CO, níquel e cobre. ABSTRACTLaNi 1-x Cu x O 3 (x = 0.0, 0.3 and 0.5) type solids with perovskite structure were studied in this work aiming to develop catalysts for the production of high pure hydrogen in the internal reforming of solid oxide fuel cells (SOFC). It was observed that the experimental conditions used for preparing the samples favored the quantitative incorporation of cations in the precursor and the formation of solids with perovskite structure. These materials showed different reducing properties and the copper presence favored the stability of the perovskite structure. The catalytic properties of the samples were evaluated in water gas shift reaction (WGSR), an important step for purifying hydrogen in the process of hydrocarbons reforming. The results showed that the catalysts are promising for the reaction, showing much higher activities than a iron oxidebased commercial catalyst containing chromium and copper; This was assigned to the tendency of the samples in favoring the adsorptive mechanism, probably due to a high mobility of oxygen in the crystalline lattice. The highest value of catalytic activity was shown by the LaNi 0.5 Cu 0.5 O 3 sample, the catalyst with the best performance.

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Effect of copper oxide on the catalytic activity of iron-chromia catalyst for water gas shift reaction

Cited by 41 publications

References 3 publications

Effect of Loading Potassium and Palladium over Iron-Based Catalyst for Low Temperature Water–Gas Shift Reaction

Effect of Loading Potassium and Palladium over Iron-Based Catalyst for Low Temperature Water–Gas Shift Reaction

Chromium and Copper-Doped Magnetite Catalysts for the High Temperature Shift Reaction

Síntese e caracterização de perovskitas do tipo LaNi1-xCu xO3 para a purificação de hidrogênio para PaCOS

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