Mechanisms of methanol decomposition on Pd {111}
作者： M. Rebholz , N. Kruse
DOI: 10.1063/1.461348
关键词: Thermal desorption 、 Carbon monoxide 、 Chemistry 、 Hydrogen 、 Analytical chemistry 、 Static secondary-ion mass spectrometry 、 Adsorption 、 Methanol 、 Desorption 、 Thermal desorption spectroscopy
摘要: The decomposition of methanol (CH3OD) on a Pd{111} single crystal surface has been investigated by combined static secondary ion mass spectrometry (SSIMS), x‐ray photoelectron spectroscopy (XPS), and temperature programmed desorption (TPD). SSIM spectra contain number ions, including CH+x(x=0–3), PdCH+3, PdO+ (or PdOD+ ), PdOCH+3 PdnCO+(n=1–3). These ions indicate the presence methyl, oxygen (hydroxyl), methoxy, carbon monoxide in adsorbed layer. absolute relative intensities have found to depend gas pressure temperature. latter varied linear time program (TPSSIMS) order monitor changes composition reaction route leading CO hydrogen involves methoxy formation decomposition. Thus O–H C–H bond breaking occur successive steps. Steady concentrations, maintained adsorption thermal (after recombination with hydrogen), build up d...
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