Preferential CO oxidation in a H2-rich gas by Au/CeO2 catalysts Nanoscale CeO2 shape effect and mechanism aspect

被引：57

作者：

Yi, Guangquan ^{[1
]}

Yang, Hongwei ^{[1
]}

Li, Bodong ^{[1
]}

Lin, Haiqiang ^{[1
]}

Tanaka, Ken-ichi ^{[2
]}

Yuan, Youzhu ^{[1
]}

机构：

[1] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Natl Engn Lab Green Chem Prod Alcohols Ethers Est, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China

[2] Saitama Inst Technol, Adv Sci Res Lab, Fukaya, Saitama 3690293, Japan

来源：

CATALYSIS TODAY | 2010年 / 157卷 / 1-4期

关键词：

Gold; CeO2; CO preferential oxidation; Shape effect; Hydrogen Isotope effect; Mechanism; SUPPORTED GOLD NANOPARTICLES; CARBON-MONOXIDE; SELECTIVE OXIDATION; ROOM-TEMPERATURE; CERIA CATALYSTS; EXCESS HYDROGEN; STREAM; SHIFT; H-2; AU/ALPHA-FE2O3;

D O I：

10.1016/j.cattod.2010.01.049

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The Au/CeO2 catalysts with nanoscale CeO2 shapes of rods cubes and polyhedra were evaluated for the CO preferential oxidation (CO-PROX) in a hydrogen-rich gas showing a strong effect of CeO2 morphology followed by this order rods > polyhedra > cubes The results of pulse experiment and kinetic study indicated that the oxidation of CO could be enhanced by H-2 and H2O moisture behaving a hydrogen isotope effect by H-2/D-2 The catalyst Au/CeO2-rods exhibited the lowest apparent activation energy for the CO oxidation either with or without hydrogen in comparison with the Au/CeO2-polyhedra and Au/CeO2-cubes It was proposed that hydrogen reacted with adsorbed oxygen to yield highly oxidizing surface H-containing intermediates that could readily converted CO to CO2 at lower temperatures The generation of such key intermediates might be involved into the rate-determining step (C) 2010 Elsevier B V All rights reserved

引用

页码：83 / 88

页数：6

共 38 条

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