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

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.465745· OSTI ID:6487318

Xu, J; Yates, Jr, J T ^[1]

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1. Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)

The catalytic reaction CO([ital a])+O([ital a])[r arrow]CO[sub 2]([ital g]) has been studied on Pt(335) using infrared reflection absorption spectroscopy (IRAS) and temperature programmed reaction (TPR) methods. Both dissociative O[sub 2] adsorption and CO adsorption occur preferentially on the step sites. It has been found that chemisorbed CO on the (111) [ital terrace] [ital sites] is more reactive than chemisorbed CO on the (100) step sites. In contrast, chemisorbed O on the [ital step] [ital 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([ital S])] interacting with terrace sites CO [CO([ital T])]. This new information provides a conceptual basis for understanding the interplay between geometrical and energetic factors influencing the CO oxidation reaction.

• OSTI ID: 6487318
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 99:1; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTALS
ELEMENTS
INFRARED SPECTRA
METALS
MONOCRYSTALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REFLECTION
SPECTRA
TRANSITION ELEMENTS