The effect of supports on the activity and selectivity of CoNi alloy catalysts for CO hydrogenation

Tatsumi Ishihara, Nobuhiko Horiuchi, Koichi Eguchi, Hiromichi Arai

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    The CO hydrogenation activity of 50Co50Ni alloy catalysts strongly depended on the oxide support. Electron-donating oxides such as MgO, PbO, and ZnO lowered the overall activity of the 50Co50Ni metal. The CO conversion as well as the chain growth probability was high over 50Co50Ni/TiO2 and 50Co50Ni/MnO2. The infrared spectra of adsorbed NO indicated that the electron density of the 50Co50Ni metal was low when it was supported on electron-accepting oxide. The results of desorption measurements suggest that metal-support interaction has a great influence on the surface concentration of hydrogen and carbon monoxide, and adsorption of carbon monoxide and hydrogen is weakened by increasing the electronegativity of the oxide support. Since the rate of H2D2 exchange correlated well with the CO hydrogenation rate, activation of hydrogen is of primary importance in this catalyst system. The low electron density of the alloy supported on the electron-accepting oxides such as TiO2 and SiO2 weakens CO adsorption, resulting in an increase in surface coverage of hydrogen. Thus sufficient coverage of hydrogen leads to a high CO hydrogenation rate.

    Original languageEnglish
    Pages (from-to)202-211
    Number of pages10
    JournalJournal of Catalysis
    Volume130
    Issue number1
    DOIs
    Publication statusPublished - Jul 1991

    All Science Journal Classification (ASJC) codes

    • Catalysis
    • Physical and Theoretical Chemistry

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