Controlled deposition of Co2(CO)8 on silica in a fluidized bed reactor: IR, chemisorption and decomposition studies

Sari Suvanto, Tapani A. Pakkanen, Leif Backman

    Research output: Contribution to journalArticleScientificpeer-review

    26 Citations (Scopus)

    Abstract

    Dicobalt octacarbonyl, Co2(CO)8, was deposited on silica support pretreated at 300°C, 500°C and 600°C, by vapour-phase adsorption at low temperature in a fluidized bed reactor. Adsorption of cobalt carbonyl on the silica surface and decarbonylation during heat treatment were followed by diffuse reflectance IR spectroscopy. The Co2(CO)8 rearranged to Co4(CO)12 and the surface was completely decarbonylated via subcarbonyl species. The decarbonylation of cobalt carbonyl on silica was also studied by temperature programmed reduction. Energy dispersive X-ray fluorescence was used to determine the cobalt content on the silica surface. Pretreatment temperature did not affect the saturation level of the cobalt carbonyl but influenced the hydrogen uptake of the non-decarbonylated samples in hydrogen chemisorption studies. Therefore, in gas phase preparation method the pretreatment temperature of the silica support could prove to be useful in the preparation of catalyst systems. A higher amount of cobalt on the support could be achieved through repetition of the deposition–decarbonylation sequence.
    Original languageEnglish
    Pages (from-to)25-36
    JournalApplied Catalysis A: General
    Volume177
    DOIs
    Publication statusPublished - 1999
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Dicobalt octacarbonyl
    • fluidized bed reactor
    • FTIR
    • silica
    • TPR

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