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W2094202373 abstract "The rate, r, of CO hydrogenation into methane over NiSiO2 catalysts is shown to vary in a complex way with temperature and pressure. The true activation energy, E0, calculated from the Temkin relation (apparent activation energy against the order to CO and extrapolation to zero order), corresponds to that of the hydrogenation of carbon deposited on the surface from the CO dissociation reaction. It is deduced that the active intermediate is the surface carbon, and the rate-determining step the hydrogenation of this intermediate. Kinetic data are qualitatively accounted for assuming the following equation r = ke−E0RTPH2(1 − θCO)WθCO is the surface coverage in nondissociated inactive adsorbed CO molecules which are considered as the most abundant species present on the surface. The parameter W is probably very large (W = 13 on the basis of data of CO + H2 over NiCuSiO2). In this equation, the term (1 − θCO)W represents the probability of having W adjacent Ni atoms free from inactive adsorbed CO. This ensemble should be considered as the active site and is covered with one active monocarbon adspecies." @default.
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W2094202373 date "1983-11-01" @default.
W2094202373 modified "2023-09-25" @default.
W2094202373 title "The kinetics and mechanism of carbon monoxide methanation over silica-supported nickel catalysts" @default.
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W2094202373 doi "https://doi.org/10.1016/0021-9517(83)90084-2" @default.
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