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• W1994642198 abstract "Time-resolved Fourier transform infrared spectroscopy (TR-FTIR) was used to simultaneously examine the mechanism and kinetics of methoxy decomposition on Ni(100) under varying conditions. The use of TR-FTIR to obtain kinetic parameters was first validated by comparison to temperature-programmed desorption using annealed CO adlayers. Assuming a first-order reaction with a constant pre-exponential factor of 5.2 × 1012 s−1, we find the activation energy for methoxy decomposition to CO and hydrogen to increase as the reaction proceeds according to 16.9 + 10θCO ± 0.3 kcal/mol, where θCO is the coverage of CO product in monolayers, for initial methoxy coverages between 0.18 and 0.056 ML. The addition of 0.10 ± 0.02 ML of CO increases the energy for CH bond activation to 19.2 ± 0.4 kcal/mol. Coadsorbed sulfur was found to inhibit both methoxy formation and decomposition. The addition of 0.14 ± 0.02 ML of sulfur raises the activation energy for methoxy decomposition by 1 ± 0.4 kcal/mol, an effect similar in magnitude to coadsorbed CO. The preadsorption of 0.4 ML of hydrogen reduces the amount of methoxy formed from a methanol multilayer but does not raise the activation energy for methoxy decomposition. These results are compared to methoxy decomposition studies on Ni(111) and Ni(110)." @default.
• W1994642198 created "2016-06-24" @default.
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• W1994642198 date "1995-07-01" @default.
• W1994642198 modified "2023-09-27" @default.
• W1994642198 title "The determination of the decomposition mechanism and kinetics of methoxy on clean Ni(100) and the effects of coadsorbed hydrogen, CO, and sulfur by time-resolved Fourier transform infrared spectroscopy" @default.
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• W1994642198 doi "https://doi.org/10.1016/0039-6028(95)00360-6" @default.
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