期刊
JOURNAL OF CATALYSIS
卷 274, 期 1, 页码 1-10出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.05.022
关键词
CO oxidation; Pt catalyst; Pd catalyst; Kinetic measurements; Strong metal-support interaction (SMSI) effect; Oxygen vacancy; H-2-O-2 titration; Time-resolved CO titration
资金
- National Sciences Foundation of China [20773146]
A series of FeOx- and Al2O3-supported Pt, Pd catalysts (0.23-2.1%) were prepared in this study. Pt/FeOx exhibited high CO oxidation activity with turnover frequency of 151 x 10(-3) s(-1) (1% CO balanced with air, atmospheric pressure, 27 degrees C). A systematical study of FeOx- and Al2O3-supported Pt, Pd catalysts by means of X-ray photoelectron spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, temperature-programmed reduction, H-2-O-2 titration, and time-resolved CO titration is reported. From 7% to 39% of Fe3+ was reduced to Fe2+ over Fe(OH)(x)-supported Pd and Pt catalysts, accompanied by Pd, Pt hydrogenation and hydroxyl loss, and a large amount of oxygen vacancies were proposed to be produced. Results of H-2-O-2 titration and time-resolved CO titration showed that a large amount of oxygen adsorbed onto FeOx support in the presence of Pt, Pd. This made CO oxidations over Pt/FeOx, Pd/FeOx proceed over two adjacent but different active sites (Pt, Pd for CO and FeOx for oxygen) with low apparent activation energies (30-34 kJ/mol), which accounted for their high activity in low-temperature CO oxidation. (C) 2010 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据