Infrared study of CO adsorption on Pt-Rh/SiO2 catalysts

James A. Anderson, Frigyes Solymosi

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18 Citations (Scopus)


Infrared spectra are reported of CO adsorbed on Pt/SiO2, Rh/SiO2 and Pt-Rh/SiO2 in the temperature ranges 93-300 and 303-573 K. CO adsorption as a function of time was studied for high-temperature reduced samples (973 K). The influence of platinum was to decrease the rate at which the rhodium gem-dicarbonyl species was formed and to increase the rate at which metal clusters were reformed. Coupling effects between Pt-CO and Rh-CO at low temperatures indicate that crystallites exist containing well mixed surface layers of platinum and rhodium atoms. The effect of platinum on rhodium particle morphology is discussed.

Original languageEnglish
Pages (from-to)3435-3442
Number of pages8
JournalJournal of the Chemical Society, Faraday Transactions
Issue number20
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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