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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 292023.0, Fritz-Haber-Institut / Physical Chemistry
On the propagation rate of the chemical waves observed during the course of CO oxidation on a Ag/Pd(110) composite surface
Authors:Huang, Weixin; Bao, Xinhe
Date of Publication (YYYY-MM-DD):2004-06-17
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Issue / Number:24
Start Page:8390
End Page:8396
Copyright:© 2004 The American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:Adjacent Crystal Planes; Heterogeneous Catalysis; Kinetic Oscillations; Pattern-Formation; Microscopy; Boundaries; Adsorption; Diffusion; Pt(100)
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Huang WX (reprint author) Bao XH, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Identifiers:URL: [Abstract]
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