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- W2080668411 abstract "The effect of addition of manganese and potassium promoters onto iron catalysts for hydrogenation of carbon dioxide was investigated. Catalyst characterizations were performed using BET surface area measurement, carbon monoxide chemisorption, temperature-programmed reduction and Mössbauer spectroscopy. It was noted that metallic iron catalysts were carburized to θ-Fe3C and χ-Fe5C2 as well as oxidized to Fe3O4 during the course of reaction. The promotional effect of manganese was reflected in stabilization of catalytic behavior owing to a higher resistance to bulk oxidation. However, the distribution of hydrocarbon products did not change significantly in the presence of manganese promoter. With further addition of potassium promoter, the bulk phase was more likely to transform to carbides, and the selectivity toward olefins and long-chain hydrocarbons was remarkably enhanced. On a étudié l'effet de l'ajout de promoteurs au manganèse et potassium sur des catalyseurs de fer pour l'hydrogénation du gaz carbonique. La caractérisation des catalyseurs a été réalisée par une mesure BET de la zone de surface, la chimisorption de l'oxyde de carbone, une réduction à température programmée et la spectroscopie Mössbauer. On a remarqué que les catalyseurs de fer métallique sont cémentés en θ-Fe3C et χ-Fe5C2 et qu'ils sont oxydés en Fe3O4 lors de la réaction. L'effet promotionnel du manganèse se reflète dans la stabilisation du comportement catalytique en raison d'une plus haute résistance à l'oxydation en masse. Cependant, la distribution des hydrocarbures ne change pas de façon significative en présence du promoteur au manganèse. Avec un nouvel ajout de promoteur de potassium, la phase principale est plus susceptible de se transformer en carbures, et la sélectivité vers les oléfines et les hydrocarbures de chai'nes longues est remarquablement améliorée." @default.
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- W2080668411 date "2009-03-27" @default.
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- W2080668411 title "Hydrogenation of carbon dioxide on iron catalysts doubly promoted with manganese and potassium" @default.
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- W2080668411 doi "https://doi.org/10.1002/cjce.5450700314" @default.
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