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- W2038226154 abstract "Surface temperature modulation has been employed to investigate the adsorption, desorption and oxidation of CO on the Pt(110)-(1 × 2) surface. Examination of the adsorption-desorption equilibrium allows a determination of the kinetic parameters describing the desorption reaction. In the limit of zero coverage, the activation energy of desorption is 36±1.5 kcal mol−1 with a first-order preexponential factor of 3 × 1014 s−1. As the coverage of CO increases, both parameters decrease in magnitude. The oxidation of CO has been studied with an emphasis on examining the kinetics of the elementary “bimolecular” surface reaction CO(a)+O(a) → CO2(g). By varying both the reactant partial pressure ratio and the steady-state temperature of the surface, the reaction rate parameters have been evaluated for a variety of combinations of adsorbate concentrations occurring at steady state. The magnitudes of both the activation energy and the preexponential factor of the reaction rate coefficient have been found to correlate well with the oxygen adatom concentration. In the low-coverage limit, the activation energy is 22±1 kcal mol−1, and the preexponential factor is 3 × 10−3 cm2 s−1. As the oxygen adatom concentration increases beyond a fractional coverage of approximately 0.15, the magnitudes of both parameters drop precipitously to values given, respectively, by 8±1 kcal mol−1 and 10−10 cm2 s−1. The decrease in the activation energy at high oxygen coverages is explained best by a decrease in the binding energies of the adsorbed reactants. The apparent decrease in the preexponential factor could well be due to the local configuration of the reactants that occurs at high oxygen coverages." @default.
- W2038226154 created "2016-06-24" @default.
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- W2038226154 date "1988-01-01" @default.
- W2038226154 modified "2023-09-23" @default.
- W2038226154 title "Analysis of gas-surface reactions by surface temperature modulation: Experimental applications to the adsorption and oxidation of carbon monoxide on the Pt(110)-(1 × 2) surface" @default.
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- W2038226154 doi "https://doi.org/10.1016/0039-6028(88)90603-6" @default.
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