KINETICS OF CATALYTIC REACTIONS ON A UNIFORM SURFACE AND SINGLE SITES: SIMILARITY AND DIFFERENCE

Vladimir P. Zhdanov ()
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Vladimir P. Zhdanov: Competence Center for Catalysis, Chalmers University of Technology, S-41296 Göteborg, Sweden;

Surface Review and Letters (SRL), 2009, vol. 16, issue 05, 757-760

Abstract: To illustrate typical similarities and differences in the reaction kinetics occurring on a uniform surface and single sites (e.g. on single metal atoms incorporated into the inner walls of zeolite), we analyze a generic reaction scheme ofN2Odecomposition running in the presence of oxygen. In both cases, there are three reaction regimes, (i) controlled exclusively by theN2O-decomposition step, (ii) partly inhibited by oxygen, or (iii) limited by oxygen desorption. Regime (i) is kinetically similar (first order inN2O) in the two cases. The states of the catalytic sites are however different. Regime (ii) exhibits different reaction orders in oxygen (-0.5 for the surface and -1 for single sites). Regime (iii) is fully identical in both the cases.

Keywords: Kinetics; surface chemical reactions; reaction orders; low index single crystal surfaces; single catalytic sites; catalyticN2Odecomposition; 82.65.Tr; 68.43.Mn; 68.43.De; 82.20.Wt (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09013116

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