期刊
JOURNAL OF CHEMICAL PHYSICS
卷 119, 期 20, 页码 10867-10878出版社
AMER INST PHYSICS
DOI: 10.1063/1.1620993
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The development of a methanol multilayer on Pd{110} at 124 K has been examined with reflection absorption infrared spectroscopy (RAIRS). The spectra indicate that a crystalline multilayer grows in which hydrogen-bonded chains of molecules are parallel to the substrate. A sandwich'' phase is identified and consists of several physisorbed layers in between the chemisorbed layer and the crystalline phase. Methanol desorption and decomposition on heating have been followed with simultaneous temperature-programmed RAIRS and TPD measurements. Desorption of chemisorbed methanol is observed at 214 K, whereas the decomposition reaction yielding adsorbed CO and H proceeds at similar to295 K on heating at 2 K s(-1). Spectral bands observed on adsorption at 180 K to low exposure, which precede the appearance of the CO signal, are tentatively attributed to chemisorbed methanol. No conclusive evidence for a methoxy intermediate in the decomposition reaction is found. (C) 2003 American Institute of Physics.
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