Non-Faradaic electrochemical modification of catalytic activity - 12. Propylene oxidation on Pt

被引：35

作者：

Kaloyannis, A ^{[1
]}

Vayenas, CG ^{[1
]}

机构：

[1] Univ Patras, Dept Chem Engn, GR-26500 Patras, Greece

来源：

JOURNAL OF CATALYSIS | 1999年 / 182卷 / 01期

关键词：

D O I：

10.1006/jcat.1998.2311

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 rate of complete propylene oxidation on polycrystalline Pt films deposited on 8 mol% Y2O3-stabilized-ZrO2 (YSZ), an O2- conductor, can be reversibly enhanced by up to a factor of 6 by varying the potential of the Pt catalyst film. The reaction rate increase is typically 2000 times higher than the electrochemically controlled rate of oxygen removal from the Pt catalyst surface. Electrochemical supply of promoting oxide ions does not affect significantly the catalytic rate. The catalytic reaction activation energy varies linearly by a factor of 4 with varying catalyst potential, leading to the appearance of the compensation effect. The observed pronounced promotional phenomena are discussed in view of the reaction mechanism, previous electrochemical promotion studies, and recent TPD and XPS investigations. (C) 1999 Academic Press.

引用

页码：37 / 47

页数：11

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