Catalytic production of methane from CO2 and H2 at low temperature: insight on the reaction mechanism
(2010) Catalysis Today — Vol. 157, p. 462-466 (2010)
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- (en) Experimental evidences show that it is possible to produce methane from an exclusively inorganic way using CO 2 and H 2 on a Rh/γ-Al 2 O 3 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 CO 2 on the catalyst. The second step is the dissociation of CO 2 into CO and O adsorbed on the surface. The third step is the reaction of dissociated species with H 2 . Adsorption, dissociation of CO 2 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 CO 2 oxidizes the catalyst and this oxidation deactivates the catalyst. The conversion of CO 2 also increases with temperature. Methane is the unique hydrocarbon molecule formed and obtained with almost 100% selectivity. No other hydrocarbonated products have been observed.
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Jacquemin, M., Beuls, A., & Ruiz, P. (2010). Catalytic production of methane from CO2 and H2 at low temperature: insight on the reaction mechanism. Catalysis Today, 157, 462-466. https://doi.org/10.1016/j.cattod.2010.06.016 (Original work published 2010)