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题名: Low-temperature oxidation of CO over Pd/CeO2-TiO2 catalysts with different pretreatments
作者: Zhu, HQ;  Qin, ZF;  Shan, WJ;  Shen, WJ;  Wang, JG
通讯作者: Jianguo Wang
关键词: CO oxidation ;  palladium ;  ceria ;  titania pretreatment ;  calcination ;  reduction ;  CeO2-TiO2
刊名: JOURNAL OF CATALYSIS
发表日期: 2005-07-01
DOI: 10.1016/j.jcat.2005.04.033
卷: 233, 期:1, 页:41-50
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 501
产权排名: 2;3
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: A comprehensive study of the low-temperature oxidation of CO was conducted over Pd/TiO2, Pd/CeO2, and Pd/CeO2-TiO2 pretreated by a series of calcination and reduction processes. The catalysts were characterized by N-2 adsorption, XRD, H-2 chemisorption, and diffuse-reflectance infrared Fourier transform spectroscopy. The results indicated that Pd/CeO2-TiO2 has the highest activity among these catalysts, whether in the calcined state or in the reduced state. The activity of all of the catalysts can be improved significantly by the pre-reduction, and it seems that the reduction at low temperature (LTR. 150 degrees C) is more effective than that at high temperature (HTR, 500 degrees C), especially for Pd/CeO2 and Pd/TiO2. The catalysts with various supports and pretreatments are also different in the reaction mechanisms for CO oxidation at low temperature. Over Pd/TiO2, the reaction may proceed through a surface reaction between the weakly adsorbed CO and oxygen (Langmuir-Hinshelwood). For Ce-containing catalysts, however, an alteration of reaction mechanism with temperature and the involvement of the oxygen activation at different sites were observed, and the light-off profiles of the calcined Pd/CeO2 and Pd/CeOi-TiO2 show a distortion before CO conversion achieves 100%. At low temperature, CO oxidation proceeds mainly via the reaction between the adsorbed CO on Pd-0 sites and the lattice oxygen of surface CeO2 at the Pd-Ce interface, whereas at high temperature it proceeds via the reaction between the adsorbed CO and oxygen. The high activity of Pd/CeO2-TiO2 for the low-temperature CO oxidation was probably due to the enhancements of both CO activation, caused by the facilitated reduction of Pd2+ to Pd-0, and oxygen activation, through the improvement of the surface oxygen supply and the oxygen vacancies formation. The reduction pretreatment enhances metal-support interactions and oxygen vacancy formation and hence improves the activity of CO oxidation. (c) 2005 Elsevier Inc. All rights reserved.
关键词[WOS]: TRANSFORM INFRARED-SPECTROSCOPY ;  SUPPORTED RHODIUM CATALYSTS ;  WATER-GAS-SHIFT ;  CARBON-MONOXIDE ;  3-WAY CATALYSTS ;  HYDROGEN CHEMISORPTION ;  ROOM-TEMPERATURE ;  CU CATALYSTS ;  CERIA ;  PD
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000230122100005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/92575
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, State Key Lab Coal Convers, Inst Coal Chem, Taiyuan 030001, Shanxi, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Zhu, HQ,Qin, ZF,Shan, WJ,et al. Low-temperature oxidation of CO over Pd/CeO2-TiO2 catalysts with different pretreatments[J]. JOURNAL OF CATALYSIS,2005,233(1):41-50.
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