Catalytic Performance in CO Hydrogenation Over SiO2-Supported Ru-M （M=Co, Fe,Mo,Ni,Rh,Mn and Cr） Bimetallic Cluster-derived Catalysts

The bimetallic Ru-M （M=Co,Fe,Ni,Mo, Rh,Cr, Mn） catalysts were prepared from SiO2-supported bimetallic carbonyl clusters, and it was found that the Ru-Co, Ru-Fe and Ru-Mo bimetallic carbonyl cluster-derived catalysts showed higher activity and selectivity for oxygenates such as C1-C5 alcohols in CO hydrogenation,in contrast to catalysts prepared from SiO2-supported homometallic Ru and Co carbonyl clusters. In situ FT-IR studies revealed that the bands at 1584 and 1555 cm-1 species were intermediates to produce methanol and higher oxygenates,and at higher temperatures the 1584 cm-1 species could react with alkyl to form 1555 cm-1 species. By the surface chemical reaction and the IR study of isotopic molecules,it was suggested that 1584 and 1555 cm-1 were assigned to surface formyl and acetyl species.