Near-ambient X-ray photoemission spectroscopy and kinetic approach to the mechanism of carbon monoxide oxidation over lanthanum substituted cobaltites

被引：23

作者：

Hueso, J. L. ^{[1
,2
]}

Martinez-Martinez, D. ^{[1
]}

Caballero, A. ^{[1
,2
]}

Gonzalez-Elipe, A. R. ^{[1
,2
]}

Mun, B. S. ^{[3
]}

Salmeron, M. ^{[4
]}

机构：

[1] Univ Seville, CSIC, Inst Ciencia Mat Sevilla, Seville 41092, Spain

[2] Univ Seville, Dept Quim Inorgan, Seville 41071, Spain

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

CATALYSIS COMMUNICATIONS | 2009年 / 10卷 / 14期

关键词：

Near-ambient XPS; CO oxidation; Perovskites; CATALYTIC PROPERTIES; PEROVSKITE OXIDES; METHANE COMBUSTION; PLASMA CATALYSIS; CO OXIDATION; LACOO3; NO; LA1-XSRXCOO3; ADSORPTION; REDUCTION;

D O I：

10.1016/j.catcom.2009.06.022

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：

We have studied the oxidation of carbon monoxide over a lanthanum substituted perovskite (La0.5Sr0.5CoO3-d) Catalyst prepared by spray pyrolysis. Under the assumption of a first-order kinetics mechanism for CO, it has been found that the activation energy barrier of the reaction changes from similar to 80 to similar to 40 kJ mol(-1) at a threshold temperature of ca. 320 degrees C. In situ XPS near-ambient pressure (similar to 0.2 torr) shows that the gas phase oxygen concentration over the sample decreases sharply at ca. 300 degrees C. These two observations suggest that the oxidation of CO undergoes a change of mechanism at temperatures higher than 300 degrees C. (c) 2009 Elsevier B.V. All rights reserved.

引用

页码：1898 / 1902

页数：5

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