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• W2068573990 abstract "CO hydrogenation was studied on four (1, 3, 10 and 15 wt%) CoAl2O3 catalysts using the technique of temperature-programmed surface reaction (TPSR). Two distinct methane peaks (Peaks A and B) are observed for 3, 10 and 15% CoAl2O3 during TPSR of chemisorbed CO at room temperature, indicating the presence of two different reaction states or mechanisms for CO hydrogenation (A and B). No methane peak is observed for 1% CoAl2O3 unless it is reduced at 1023 K. The more active A state, the relative population of which increases with increasing metal loading and increasing extent of reduction, probably corresponds to hydrogenation of atomic carbon on 3D cobalt crystallites while the less active B state is assigned to decomposition on metal crystallites of a methoxy or formate species originally formed on the support from spilled-over hydrogen and carbon monoxide. TPSR spectra of hydrogen with carbon deposited by CO dissociation at 523 K show that the quantity of active α-carbon increases with increasing metal loading and correlates with the relative population of A sites. A linear correlation between logarithm of the steady-state methane turnover frequency and the relative population of A sites suggests that large variations in the steady-state CO hydrogenation rate with dispersion and metal loading observed for these catalysts may be explained in terms of variations in the distribution of reaction states for CO hydrogenation, i.e., a larger fraction of Reaction A at higher metal loadings and higher extents of reduction." @default.
• W2068573990 created "2016-06-24" @default.
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• W2068573990 date "1989-11-01" @default.
• W2068573990 modified "2023-09-27" @default.
• W2068573990 title "Multiple reaction states in CO hydrogenation on alumina-supported cobalt catalysts" @default.
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• W2068573990 doi "https://doi.org/10.1016/0021-9517(89)90264-9" @default.
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