CO adsorption energy on planar Au/TiO2 model catalysts under catalytically relevant conditions

被引：39

作者：

Diemant, T. ^{[1
]}

Hartmann, H. ^{[1
]}

Bansmann, J. ^{[1
]}

Behm, R. J. ^{[1
]}

机构：

[1] Univ Ulm, Inst Catalysis & Surface Chem, D-89069 Ulm, Germany

来源：

JOURNAL OF CATALYSIS | 2007年 / 252卷 / 02期

关键词：

IR absorption-reflection spectroscopy; adsorption energy; coadsorption; model catalyst; gold; titanium oxide; carbon monoxide; oxygen;

D O I：

10.1016/j.jcat.2007.09.024

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 of CO on planar Au/TiO2 model catalysts was studied by polarization-modulation infrared reflection-absorption spectroscopy (PM-IRAS) under catalytically relevant pressure (10-50 mbar) and temperature (30-120 degrees C) conditions, both in pure CO and in CO/O-2 reaction gas mixtures. The adsorption energy of CO on the Au particles was determined by a quantitative analysis of the temperature dependence of the CO absorption intensity in adsorption isobars. The data reveal considerable effects of the An particle size when pure CO is used; the initial adsorption energy decreases from 74 kJ mol(-1) (2 nm mean Au particle diameter) to 62 kJ mol(-1) (4 nm). For CO/O-2 gas mixtures, the initial CO adsorption energy is, irrespective of the Au particle size, constant at 63 kJ mol(-1) (i.e., the CO adsorption energy is reduced for smaller An particles), but this effect vanishes for larger Au particles. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：171 / 177

页数：7

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