High-resolution x-ray photoelectron spectroscopy study of the ethanol oxidation reaction on Pd(110)
High-resolution x-ray photoelectron spectroscopy study of the ethanol oxidation reaction on Pd(110)
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DOI：
10.1063/1.478777
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发表时间：
1999-05-01
影响因子：
4.4
通讯作者：
Bowker, M
中科院分区：
文献类型：
--
作者：
Holroyd, RP;Bennett, RA;Bowker, M
采用高分辨率x射线光电子能谱（XPS）和程序升温XPS研究了乙醇在Pd（110）上的吸附、分解和氧化。先前用分子束和热解吸光谱研究的乙醇在清洁表面分解（分解为甲烷、氢和一氧化碳；分解为甲烷、氢、碳和氧的吸附原子）的途径被本研究证实。除了产生水和在380 K以上的温度下作为氧化产物产生二氧化碳外，在清洁表面上观察到的主要或次要分解途径并没有明显改变。它还导致乙酸的形成，这是在程序升温解吸过程中首次发现的二氧化碳和氢的同步解吸，并通过XPS得到证实。在TPXPS过程中，两个c1s峰同时出现，一个属于醋酸酯中的甲基碳，另一个属于羧酸碳。XPS中这些峰的消失发生在与程序升温解吸相似的温度下（400k）。(C) 1999年美国物理研究所。[s0021 - 9606(99) 70217 - 5]。
The adsorption, decomposition, and oxidation of ethanol on Pd(110) has been studied using high-resolution x-ray photoelectron spectroscopy (XPS) and temperature-programmed XPS. The decomposition pathways of ethanol on the clean surface (to methane, hydrogen and carbon monoxide; and to methane, hydrogen, and carbon and oxygen adatoms) previously studied using molecular beam and thermal desorption spectroscopy were confirmed by this study. The presence of an overlayer of oxygen did not significantly alter the major or minor decomposition pathways observed on the clean surface, except for the production of water and, at temperatures above 380 K, carbon dioxide as oxidation products. It also resulted in the formation of acetate, which was first seen during temperature-programmed desorption as coincident carbon dioxide and hydrogen desorption, and was confirmed by XPS. Two C 1s peaks, one assigned to the methyl carbon in acetate and the other to the carboxylate carbon, developed simultaneously during TPXPS. The disappearance of these peaks in XPS occurred at a similar temperature (400 K) to that seen during temperature-programmed desorption. (C) 1999 American Institute of Physics. [S0021-9606(99)70217-5].