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Photocatalytic Reduction of Co2 With H2o on tiO2 and Cu/TiO2 Catalysts

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Photoinduced reduction of CO2 by H2O to produce CH4 and CH3OH has been investigated on well-characterized standard TiO2 catalysts and on a Cu2+ loaded TiO2 catalyst. The efficiency of this photoreaction depends strongly on the kind of catalyst and the ratio of H2O to CO2. Anatase TiO2, which has a large band gap and numerous surface OH groups, shows high efficiency for photocatalytic CH4 formation. Photogenerated Ti3+ ions, H and CH3 radicals are observed as reactive intermediates, by ESR at 77 K. Cu-loading of the small, powdered TiO2 catalyst (Cu/TiO2) brings about additional formation of CH3OH. XPS studies suggest that Cu+ plays a significant role in CH3OH formation.

Affiliations: 1: Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture, Gakuen-cho, Sakai, Osaka 593, Japan; 2: Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, Nagasaki 852, Japan; 3: Laboratory of Analytical Technology, Osaka Prefectural Industrial Technology Research Institute, Higashi-Osaka, Osaka 577, Japan; 4: Ion Engineering Research Institute Corporation, Tsuda, Hirakata, Osaka 573-01, Japan; 5: Fujikin Incorporated, Nanko-Higashi Suminoeku, Osaka 559, Japan; 6: Dipartimento di Ingegneria Chimica dei Processi e dei Materiali, Universita' di Palermo, Italy; 7: Department of Chemistry, The University of Texas at Austin, Texas 78712, U.S.A


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