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• W2022686140 abstract "Transient response experiments using isotopic tracers have been carried out to determine quantitatively the coverages of adsorbed CO and carbon on a RuSiO2 catalyst during Fischer-Tropsch synthesis. In situ infrared spectra reveal that the Ru surface is virtually saturated by chemisorbed CO. The rate of exchange of adsorbed and gas-phase CO is very rapid compared to the steady-state rate of CO hydrogenation. The integrated absorption coefficient for adsorbed CO is found to decrease from 9.0 × 107 to 4.5 × 107 cm/mol as θCO increases from 0 to 1.0. Two forms of carbon, Cα and Cβ, are also present on the catalyst surface under normal reaction conditions, neither of which is associated with oxygen or hydrogen. Cα is much more reactive than Cβ. The surface coverage of Cα rapidly comes to a steady-state value and the steady-state rate of methane formation is found to be a linear function of the Cα coverage. The coverage of Cβ is considerably larger than that of Cα and continues to grow over a period of up to 5 min under reaction conditions. Cβ is formed from Cα in the presence of adsorbed hydrogen and can be converted back to Cα. It is concluded that at least a part of the Cβ deposited resides on the support and that the rest is present on the surface of Ru, and may be responsible for the gradual loss of methanation activity with time. The dependencies of the coverages of Cα and Cβ on the partial pressures of the reactants have been determined and are found to be quite different from one another." @default.
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• W2022686140 date "1984-03-01" @default.
• W2022686140 modified "2023-10-15" @default.
• W2022686140 title "Application of transient response techniques for quantitative determination of adsorbed carbon monoxide and carbon present on the surface of a ruthenium catalyst during Fischer-Tropsch synthesis" @default.
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• W2022686140 doi "https://doi.org/10.1016/0021-9517(84)90357-9" @default.
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