Reaction of CH3OH on Pd/ZnO(0001) and PdZn/ZnO(0001) model catalysts

被引：35

作者：

Bera, Parthasarathi ^{[1
]}

Vohs, John M. ^{[1
]}

机构：

[1] Univ Penn, Dept Chem & Biomol Engn, Philadelphia, PA 19104 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 19期

关键词：

D O I：

10.1021/jp068501f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption and reaction of CH3OH on Pd and PdZn films and particles supported on the (0001) surface of a ZnO single crystal were studied using temperature-programmed desorption (TPD). At 300 K, vapor-deposited Pd films followed a two-dimensional island growth mode and preferentially blocked the active sites for dissociative adsorption of methanol on the ZnO(0001) surface. Upon heating, the Pd films agglomerated into particles and reacted with the ZnO substrate to form a PdZn alloy. Methanol was found to undergo complete dehydrogenation on the supported Pd and PdZn films and particles producing CO and H-2. Consistent with previous studies, alloying of Pd with Zn decreased the strength of the interaction of CO with the metal surface, as evidenced by a decrease in the CO desorption temperature. A low-temperature pathway for the oxidation of CO to CO2 on Pd/ZnO(0001) and PdZn/ZnO(0001), in which oxygen was supplied by the ZnO(0001) support, was also identified.

引用

页码：7049 / 7057

页数：9

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