A Comparison of the Reactivity of Pd Supported on ZnO(10(1)over-bar0) and ZnO(0001)

被引：29

作者：

Hyman, Matthew P. ^{[1
]}

Lebarbier, Vannesa M. ^{[2
]}

Wang, Yong ^{[2
]}

Datye, Abhaya K. ^{[3
]}

Vohs, John A. ^{[1
]}

机构：

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

[2] Pacific NW Natl Lab, Richland, WA 99354 USA

[3] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 17期

关键词：

SINGLE-CRYSTAL SURFACES; MODEL CATALYSTS; CO ADSORPTION; METHANOL DECOMPOSITION; THERMAL-DESORPTION; PARTICLE-SIZE; FORMIC-ACID; ZNO; HYDROGEN; PD(111);

D O I：

10.1021/jp809934f

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 dependence of ZnO surface structure on Pd/ZnO-catalyzed methanol decomposition was investigated by using model catalysts consisting of Pd films and particles on ZnO(10 (1) over bar0) and ZnO(0001) single crystals. XPS Studies showed that vapor-deposited Pd grows two dimensionally at 300 K and agglomerates into particles upon heating. Temperature-programmed desorption (TPD) experiments showed that CO adsorption was weaker on Pd/ZnO(0001) relative to Pd/ZnO(1010) and that PdZn alloy formation was more facile on the ZnO(0001) compared to ZnO(10 (1) over bar0). Large differences in the amount of CO produced during methanol TPD on the Pd/ZnO(0001) and Pd/ZnO(10 (1) over bar0) samples were also observed and attributed to the presence of highly active sites at the Pd-ZnO(0001) interface. Comparisons to high surface area Pd/ZnO catalysts indicate that similar structural effects may also influence their reactivity.

引用

页码：7251 / 7259

页数：9

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