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题名: Methane combustion over supported palladium catalysts I. Reactivity and active phase
作者: Yang, SW;  Maroto-Valiente, A;  Benito-Gonzalez, M;  Rodriguez-Ramos, I;  Guerrero-Ruiz, A
关键词: palladium ;  alumina ;  zirconia ;  methane combustion ;  active phase ;  IR ;  CO adsorption ;  microcalorimetry
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2000-12-27
卷: 28, 期:3-4, 页:223-233
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The performance of Al(2)O(3), ZrO(2) and ZrO(2) stabilized with SiO(2) (ZrO(2)-s) supported palladium catalysts for the methane combustion was studied between 473 and 873 K. The nature of the surface species of palladium catalysts under reaction conditions were detected by FT-IR and microcalorimetry of CO adsorbed. The different behavior of palladium catalysts under reaction conditions is attributed to support effects associated to differences in thermal conductivity and oxygen mobility of supports. Prereduction of the catalysts enhances their activity. Under reaction conditions, the prereduced sample becomes partially oxidized by preferential adsorption/reaction of oxygen both on Pd ( 1 1 1) planes and on the sites that can multibondedly adsorb CO. The reconstruction of the metallic particles and the formation of PdO(x) (01) phase were directly observed by FT-IR and microcalorimetry of adsorbed CO. Combination of different characterization techniques with reaction results suggests that a mixed phase, Pd(0)/PdO(x), is the most active phase for methane combustion, and that a redox mechanism may occur on this phase. (C) 2000 Elsevier Science B.V. All rights reserved.
关键词[WOS]: COMPLETE OXIDATION ;  CARBON-MONOXIDE ;  LATTICE OXYGEN ;  ALPHA-ALUMINA ;  PD CATALYST ;  SURFACE ;  SILICA ;  STATE ;  CHEMISORPTION ;  CRYSTALLITES
语种: 英语
WOS记录号: WOS:000166227300008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138711
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.Univ Nacl Educ Distancia, Dept Quim Inorgan & Tecn, Fac Ciencias, Madrid 28040, Spain
2.CSIC, Inst Catalisis & Petr Quim, Madrid 28049, Spain
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Yang, SW,Maroto-Valiente, A,Benito-Gonzalez, M,et al. Methane combustion over supported palladium catalysts I. Reactivity and active phase[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2000,28(3-4):223-233.
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