G. Kadinov et al., IR SPECTROSCOPY STUDY OF CO ADSORPTION AND OF THE INTERACTION BETWEENCO AND HYDROGEN ON ALUMINA-SUPPORTED COBALT, Journal of the Chemical Society. Faraday transactions (Print), 94(19), 1998, pp. 3027-3031
Citations number
35
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
IR spectroscopy was used to study CO adsorption on two samples of 5%Co
/Al2O3. By variation of sample pretreatment, CO pressure, contact time
and mode of hydrogen coadsorption, several surface species were ident
ified: CO adsorbed on cobalt ions of different oxidation state, CO on
metallic cobalt and polycarbonyls. Three species were distinguished wh
ich gave rise to bands in the 2050-2060 cm-1 region and could coexist
on the catalyst, depending on the experimental conditions: CO linearly
adsorbed on Co atoms with partial positive charge (Co delta+), hydroc
arbonyl (Co drop HCO) and polycarbonyl [Co(CO)n]. The thermal stabilit
y and reactivity to hydrogen of the various species were studied and C
O-Co0 was found to be the most stable.