The activity of carbonyl cluster derived Co-Ru/SiO2 and Co-Ru/SiO2 catalysts in CO hydrogenation

Jari Kiviaho (Corresponding Author), Matti Reinikainen, Marita Niemelä, Kirsi Kataja, Sirpa Jääskeläinen

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We studied systematically the use of tetranuclear cobalt, cobalt-ruthenium, cobalt-rhodium and rhodium carbonyl clusters as catalyst precursors. The catalytic activities and the product distributions of the hydrogenation of carbon monoxide over Co4-nRunSiO2 and Co4-nRunSiO2  catalysts (where n = O-4) and Co4-nRunSiO2  and Co4-nRunSiO2  catalysts derived from the transition-metal carbonyl clusters were compared. Activities were highest for the catalysts derived from homometallic clusters, and lowest for catalysts with 1:1 ratio of Co/Ru or Co/Rh. Interestingly enough, the highly active homometallic cobalt catalyst was the most resistant to deactivation. On Co4-nRunSiO2  catalysts the deactivation was stronger on bimetallic sites and on the Co4-nRunSiO2  catalysts the deactivation was closely related to the presence of ruthenium. The selectivities for oxygenated compounds were clearly promoted by the bimetallic sites of Co-Rh catalysts. This result is very plausible since the probability to find dual active sites responsible for the formation of oxygenates is greater in bimetallic than in homometallic catalysts.
Original languageEnglish
Pages (from-to)187-195
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Issue number3
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

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