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.
|Number of pages||8|
|Journal||Journal of the Chemical Society, Faraday Transactions|
|Publication status||Published - 1991|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry