Effect of loading potassium and palladium over iron-based catalyst for low temperature water-gas shift reaction

Yasushi Sekine, Takahiro Chihara, Ryo Watanabe, Yuji Sakamoto, Masahiko Matsukata, Eiichi Kikuchi

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    Abstract

    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 Fe2O3 to Fe3O4. However, impregnation of potassium on iron oxide makes the catalyst structure robust. The promotion effect of Pd and potassium was not observed on SiO2 support. We therefore concluded that the synergetic effect among Pd, K, and iron oxide, was important for the WGS reaction.

    Original languageEnglish
    Pages (from-to)184-188
    Number of pages5
    JournalCatalysis Letters
    Volume140
    Issue number3-4
    DOIs
    Publication statusPublished - 2010 Dec

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    Keywords

    • Effect of potassium
    • Iron-based catalyst
    • Water gas shift reaction

    ASJC Scopus subject areas

    • Catalysis
    • Chemistry(all)

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