Catalytic oxidation of CO on Pt(335) : a study of the active site

The catalytic reaction CO(a)+O(a)→CO2(g) has been studied on Pt(335) using infrared reflection absorption spectroscopy (IRAS) and temperature programmed reaction (TPR) methods. Both dissociative O2 adsorption and CO adsorption occur preferentially on the step sites. It has been found that chemisorbe...

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Bibliographic Details
Published in:The Journal of chemical physics 1993-07, Vol.99 (1), p.725-732
Main Authors: JIAZHAN XU, YATES, J. T
Format: Article
Language:English
Subjects:
ABSORPTION SPECTRA
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
Catalytic reactions
CHALCOGENIDES
CHEMICAL REACTIONS
Chemistry
CRYSTALS
ELEMENTS
Exact sciences and technology
General and physical chemistry
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
METALS
MONOCRYSTALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REFLECTION
SPECTRA
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TRANSITION ELEMENTS 400201 > Chemical & Physicochemical Properties
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Summary:The catalytic reaction CO(a)+O(a)→CO2(g) has been studied on Pt(335) using infrared reflection absorption spectroscopy (IRAS) and temperature programmed reaction (TPR) methods. Both dissociative O2 adsorption and CO adsorption occur preferentially on the step sites. It has been found that chemisorbed CO on the (111) terrace sites is more reactive than chemisorbed CO on the (100) step sites. In contrast, chemisorbed O on the step sites is more reactive at high CO coverages than chemisorbed O on the terrace sites. The results indicate that at high CO coverages the most reactive geometry involves step site O[O(S)] interacting with terrace sites CO [CO(T)]. This new information provides a conceptual basis for understanding the interplay between geometrical and energetic factors influencing the CO oxidation reaction.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.465745