IR spectroscopy was used to study CO adsorption on two samples of By variation of sample 5%Co/Al 2 O 3 . pretreatment, CO pressure, contact time and mode of hydrogen coadsorption, several surface species were identiÐed : CO adsorbed on cobalt ions of di †erent oxidation state, CO on metallic cobalt and polycarbonyls. Three species were distinguished which gave rise to bands in the 2050È2060 cm~1 region and could coexist on the catalyst, depending on the experimental conditions : CO linearly adsorbed on Co atoms with partial positive charge (Cod`), hydrocarbonyl and polycarbonyl The thermal stability and (Co † OE H CO) [Co(CO) n]. reactivity to hydrogen of the various species were studied and COwCo0 was found to be the most stable.
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