摘要
The bimetallic Ru-M (M=Co,Fe,Ni,Mo, Rh,Cr, Mn) catalysts were prepared from SiO_2-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 C_1-C_5 alcohols in CO hydrogenation,in contrast to catalysts prepared from SiO_2-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.
The bimetallic Ru-M （M=Co,Fe,Ni,Mo, Rh,Cr, Mn） catalysts were prepared from SiO<sub>2</sub>-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 C<sub>1</sub>-C<sub>5</sub> alcohols in CO hydrogenation,in contrast to catalysts prepared from SiO<sub>2</sub>-supported homometallic Ru and Co carbonyl clusters. In situ FT-IR studies revealed that the bands at 1584 and 1555 cm<sup>-1</sup> species were intermediates to produce methanol and higher oxygenates,and at higher temperatures the 1584 cm<sup>-1</sup> species could react with alkyl to form 1555 cm<sup>-1</sup> species. By the surface chemical reaction and the IR study of isotopic molecules,it was suggested that 1584 and 1555 cm<sup>-1</sup> were assigned to surface formyl and acetyl species.
基金
Project supported by the JSPS and NSF Japan-US Cooperative Science Program (1989-1990)
the National Natural Science Foundation of China.
