Journal
CATALYSIS TODAY
Volume 157, Issue 1-4, Pages 462-466Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2010.06.016
Keywords
CO2; Methanation; Dissociation; DRIFT spectroscopy
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Experimental evidences show that it is possible to produce methane from an exclusively inorganic way using CO2 and H-2 on a Rh/gamma-Al2O3 catalyst at low temperature and atmospheric pressure New insights on the mechanism of methanation are given The first step of the mechanism in the methanation reaction could be the chemisorption of CO2 on the catalyst The second step is the dissociation of CO2 into CO and O adsorbed on the surface The third step is the reaction of dissociated species with H-2 Adsorption dissociation of CO2 and the reaction of dissociated species with H-2 are evidenced by in situ DRIFT experiments The reaction could occur between the adsorbed species However a reaction between adsorbed species and gaseous hydrogen cannot be excluded XPS shows that the CO2 oxidizes the catalyst and this oxidation deactivates the catalyst The conversion of CO2 also increases with temperature Methane is the unique hydrocarbon molecule formed and obtained with almost 100% selectivity No other hydrocarbonated products have been observed (C) 2010 Elsevier B V All rights reserved
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