Photoreduction of carbon dioxide by hydrogen over magnesium oxide

Citation
Y. Kohno et al., Photoreduction of carbon dioxide by hydrogen over magnesium oxide, PHYS CHEM P, 3(6), 2001, pp. 1108-1113
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN journal
1463-9076 → ACNP
Volume
3
Issue
6
Year of publication
2001
Pages
1108 - 1113
Database
ISI
SICI code
1463-9076(2001)3:6<1108:POCDBH>2.0.ZU;2-L
Abstract
Magnesium oxide was found to show activity for the reduction of carbon diox ide to carbon monoxide under photoirradiation using hydrogen as a reductant . Fourier transform infrared spectroscopy was applied to a study of the rea ction mechanism by detection and identification of the surface species aris ing during the photoreaction. The formation of surface formate ion was obse rved during the photoreaction. Since CO was produced from the surface forma te in the presence of CO2 under irradiation, the surface formate was a reac tion intermediate which acted as a reductant and converted another CO2 mole cule to CO. The correlation of the reaction activity with the amount of int roduced CO2 indicated that adsorbed carbonate was reduced by H-2 to the sur face formate, and that the surface formate also reduced the adsorbed carbon ate to CO. The IR spectra showed the difference in the adsorption form of C O2 between the adsorbed carbonate reduced by H-2 to the surface formate and that reduced by the surface formate to CO.