IR spectroscopy study of CO adsorption and of the interaction between CO and hydrogen on alumina-supported cobalt
- 1 January 1998
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 94 (19) , 3027-3031
- https://doi.org/10.1039/a804315i
Abstract
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 identified: CO adsorbed on cobalt ions of different oxidation state, CO on metallic cobalt and polycarbonyls. Three species were distinguished which 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 (Coδ+), hydrocarbonyl (Co H CO) and polycarbonyl [Co(CO)n]. The thermal stability and reactivity to hydrogen of the various species were studied and CO–Co0 was found to be the most stable.Keywords
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