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题名: On the propagation rate of the chemical waves observed during the course of CO oxidation on a Ag/Pt(110) composite surface
作者: Huang, WX;  Bao, XH
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2004-06-17
DOI: 10.1021/jp0495491
卷: 108, 期:24, 页:8390-8396
收录类别: SCI
文章类型: Article
项目归属: 502
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: We have analyzed the propagation rate of the chemical waves observed during the course of CO oxidation on a Ag/Pt(I 10) composite surface that were reported in our previous papers [Surf Interface Anal. 2001, 32, 179; J. Phys. Chem. B 2002, 106, 5645]. In all cases, the propagation rate v can be adequately fitted as v = v(0) + D-0/d, in which v(0) and D-0 are constants, and d is the distance between the reaction front of the chemical wave and the boundary from which the chemical wave originates. We propose that the surface species responsible for the formation of the chemical wave comes from two paths: the adsorption of molecules in the gas phase on the surface and the migration from the adjacent surface with different catalytic activity. v(0) corresponds to the contribution from the surface species due to the adsorption, and D-0/d to that of the surface species that migrates from the adjacent surface. The rate equation clearly suggests that the observed chemical wave results from the coupling between adjacent surfaces with different catalytic activities during the course of heterogeneous catalysis. These results, together with our previous reports, provide a good fundamental understanding of spillover, an important phenomenon in heterogeneous catalysis.
关键词[WOS]: ADJACENT CRYSTAL PLANES ;  HETEROGENEOUS CATALYSIS ;  KINETIC OSCILLATIONS ;  PATTERN-FORMATION ;  MICROSCOPY ;  BOUNDARIES ;  ADSORPTION ;  DIFFUSION ;  PT(100)
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000221965400043
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82089
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.Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Huang, WX,Bao, XH. On the propagation rate of the chemical waves observed during the course of CO oxidation on a Ag/Pt(110) composite surface[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2004,108(24):8390-8396.
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