In situ observation of methoxide hydrogenation on the Ni(111) surface期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

In situ observation of methoxide hydrogenation on the Ni(111) surface

Authors:	Ruiming Zhang Andrew J. Gellman

Affiliation:	(1) Department of Chemistry, University oj Illinois, 61801 Urbana, IL, USA;(2) Present address: Department of Chemical Engineering, Carnegie Mellon University, 15213 Pittsburgh, PA, USA

Abstract:	The surface chemistry of methoxide (CH₃O-) on the Ni(111) surface has been studied in the presence of hydrogen pressures up to 2 Torr. During heating in vacuum methoxide decomposes to H₂ and CO, which desorb at 380 and 445 K, respectively. The CH₃O-decomposition process is rate limited by CH bond breaking and exhibits a strong deuterium kinetic isotope effect in CD₃O-. In the presence of ambient hydrogen pressures of 0.02–2.0 Torr both CH₃O- and CD₃O-are hydrogenated directly to methanol at 310 K. Methoxide is hydrogenated by adsorbed hydrogen, which nearly saturates the surface at these pressures and temperatures.

Keywords:	Methoxide hydrogenation Ni(111) surface catalysis
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