Characterization of cobalt Fischer-Tropsch catalysts 2. Rare earth-promoted cobalt-silica gel catalysts prepared by wet impregnation

Hui Ming, Bruce Baker, Marek Jasieniak

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    Rare earth (RE) promoted cobalt-silica gel catalysts for Fischer-Tropsch (F-T) synthesis were investigated systematically by various analytical techniques. The addition of small amounts of praseodymium to cobalt-silica gel catalysts greatly enhances their activity and selectivity in the F-T synthesis. The optimal atomic ratio of Pr/Co for 6% cobalt-silica gel catalysts was found to be between 0.26 and 0.35. Spectroscopic and other experimental results show that impregnated praseodymium readily substitutes the surface silicon atoms to form negatively charged centres on the surface of the support. Due to the presence of praseodymium, the deposited cobalt species can partially react with the support. Consequently, significant amounts of surface cobalt silicates or hydrosilicates can be formed. Most of these species undergo reduction during activation and can be converted to a metallic cobalt phase that remains incorporated at the silica surface.

    Original languageEnglish
    Pages (from-to)216-225
    Number of pages10
    JournalApplied Catalysis A: General
    Volume381
    Issue number1-2
    DOIs
    Publication statusPublished - 15 Jun 2010

    Keywords

    • Catalyst characterization
    • Cobalt-silica gel catalyst
    • Promoter
    • Rare earth
    • Wet impregnation

    Fingerprint Dive into the research topics of 'Characterization of cobalt Fischer-Tropsch catalysts 2. Rare earth-promoted cobalt-silica gel catalysts prepared by wet impregnation'. Together they form a unique fingerprint.

  • Cite this