EXISTENCE OF A "HOT" ATOM MECHANISM FOR THE DISSOCIATION OFO2ON Pt(111) AND THE PHASE DIAGRAM OF CATALYTIC OXIDATION OFCO

K. M. Khan and K. Iqbal
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K. M. Khan: Nuclear Physics Division, Pakistan Institute of Nuclear Science and Technology, (PINSTECH), P.O. Nilore, Islamabad, Pakistan
K. Iqbal: Nuclear Physics Division, Pakistan Institute of Nuclear Science and Technology, (PINSTECH), P.O. Nilore, Islamabad, Pakistan

Surface Review and Letters (SRL), 2004, vol. 11, issue 01, 117-121

Abstract: The catalytic oxidation ofCOhas already been studied over a square surface through Monte-Carlo simulation via a model based on the Langmuir–Hinshelwood mechanism, in which dissociated adsorption of theO2molecule is considered on a pair of vacancies in the nearest neighborhood. The results of this study are well known. Here, we have studied this reaction on the basis of an experimentally observed hot atom mechanism on the Pt (111) surface. According to this mechanism the probability of adsorption of theO2molecule on a pair of vacancies in the nearest neighborhood is negligibly small. It is shown that if the two oxygen atoms are adsorbed at two lattice constants apart, then the model yields a steady reactive window where the continuous transition disappears. The production ofCO2starts the momentCOpartial pressure departs from zero, which is seen in the experimental situation.

Date: 2004
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DOI: 10.1142/S0218625X04005846

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