Oxygen Adsorption and Low-Temperature CO Oxidation on a Nanoporous Au Catalyst: Reaction Mechanism and Foreign Metal Effects

被引:0
作者
L. C. Wang
Y. Zhong
D. Widmann
J. Weissmüller
R. J. Behm
机构
[1] Ulm University,Institute of Surface Chemistry and Catalysis
[2] Helmholtz Center Geesthacht,Institute of Materials Research
[3] TU Hamburg-Harburg,Institute of Materials Physics and Technology
[4] Idaho National Laboratory,Biological and Chemical Processing Department
来源
Topics in Catalysis | 2018年 / 61卷
关键词
Nanoporous Au (NPG) catalyst; CO oxidation; Kinetics; Oxygen storage capacity (OSC); Dynamic studies; Temporal analysis of products (TAP); AuCu alloy;
D O I
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中图分类号
学科分类号
摘要
To further our understanding of the role of trace impurities of the second metal in the catalytic performance of unsupported, nanoporous Au (NPG) catalysts, in particular for the activation of O2, we have prepared a NPG catalyst by electrochemical leaching of Cu from a AuCu alloy and investigated its behavior in the CO oxidation reaction. The structural and chemical properties of the as-prepared catalyst as well as that after reaction for 1000 min were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The nature of the surface oxygen species and the oxygen storage capacity were investigated and quantified by multi-pulse experiments in a temporal analysis of products (TAP) reactor. The catalytic behavior in the low-temperature CO oxidation reaction was evaluated both in a TAP reactor under dynamic vacuum conditions and in a conventional micro-reactor under atmospheric pressure. We discuss implications of these results and of similar data obtained previously on a Ag-containing NPG catalyst on the reaction mechanism and on the role of the second metal in the reaction and its impact on the reaction characteristics.
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页码:446 / 461
页数:15
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