The modification of CO adlayers on [formula omitted] catalysts by preadsorbed oxygen: An infrared and pulse microreactor study

Changes in the structure of CO adlayers as the result of co-adsorbed oxygen on Pt SiO 2 catalysts have been studied using transmission infrared spectroscopy and pulsed microreactor studies. Preadsorbed oxygen was observed to cause a blue shift in the absorption frequency of adsorbed CO. The extent o...

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Bibliographic Details
Published inJournal of catalysis Vol. 81; no. 2; pp. 347 - 357
Main Authors Sárkány, János, Bartók, Mihály, Gonzalez, Richard D.
Format Journal Article
LanguageEnglish
Published Elsevier Inc 1983
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Summary:Changes in the structure of CO adlayers as the result of co-adsorbed oxygen on Pt SiO 2 catalysts have been studied using transmission infrared spectroscopy and pulsed microreactor studies. Preadsorbed oxygen was observed to cause a blue shift in the absorption frequency of adsorbed CO. The extent of the blue shift was observed to increase with the severity of the O 2 treatment. The origin of this blue shift is explained by invoking an increase in the extent of COCO dipole coupling. Both the infrared and microreactor studies strongly suggest that the increase in dipolar coupling occurs as the result of a compressed CO adlayer in which CO is segregated into isolated patches.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(83)90173-2