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• W2056623269 abstract "The catalytic performance in CO hydrogenation over Ru, RuCo, and Co carbonyl cluster-derived catalysts has been investigated, and it was found that the activity and selectivity for oxygenated products on a series of RuCo/SiO2 catalysts are much higher than those on Ru3/SiO2 and Co4/SiO2 catalysts. The mechanism of oxygenated formation on these RuCo/SiO2 catalysts has been investigated by in situ infrared, mass, and X-ray photoelectron spectroscopies. The IR spectra of reaction of CO + H2 with RuCO/SiO2 catalysts show a band appearing at 1584 cm−1 which has a good relationship to the activity and selectivity for oxygenates in CO hydrogenation. The adsorption of CO on reduced RuCo/SiO2 catalysts prepared from RuCo bimetallic carbonyl clusters exhibits a band at 1680 cm−1 shifting to 1640 cm−1 with 13CO, which is assigned to the C- and O-ended CO chemisorbed on RuCo/SiO2 catalysts. The chemical trapping of 1584 cm−1 adspecies shows that the 1584 cm−1 species reacts with H2 to produce CH4 and CH3OH, and the addition of D2 to 1584 cm−1 species results in the formation of CHD3 and CHD2OD. With the increase of reaction time and temperature, we find the bands at 1555 and 1440–1470 cm−1, while the 1584 cm−1 band gradually decreases on RuCo/SiO2 catalysts. XPS spectra demonstrate that the Ru and Co sites on the surface of RuCo/SiO2 catalysts are in the chemical state of Ru0 and Co2+, respectively, and it is suggested that the bimetallic Ru0-Co2+ sites are very active centers for the formation of oxygenates in CO hydrogenation. Considering the product distribution at various reaction temperatures, it is suggested that the 1584 and 1555 cm−1 species possibly assigned to formyl and acyl are precursors to methanol and higher C2-oxygenates, respectively, and the 1584 cm−1 species can be converted into 1555 cm−1 species by reaction with an alkyl group." @default.
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• W2056623269 date "1992-11-01" @default.
• W2056623269 modified "2023-10-18" @default.
• W2056623269 title "Mechanism of formation oxygenated compounds from CO + H2 reaction over SiO2-supported Ru$z.sbnd;Co bimetallic carbonyl cluster-derived catalysts" @default.
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• W2056623269 doi "https://doi.org/10.1016/0021-9517(92)90018-d" @default.
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