Photoreduction of CO2 to CO in the presence of H2 over various basic metal oxide photocatalysts


Kentaro Teramura,, Kyoto University Pioneering Research Unit for Next Generation, Kyoto University, Nishikyo-ku, Katsura 1, Kyoto, 615-8510, Japan
Chemical fixation of carbon dioxide (CO2) in the presence of a heterogeneous photocatalyst is a promising method for converting it into other carbon sources such as carbon monoxide (CO), formaldehyde (HCHO), formic acid (HCOOH), methanol (CH3OH), and methane (CH4). We have reported that the photoreduction of CO2 to CO as the product over Rh/TiO2 and basic metal oxides such as ZrO2, MgO and Ga2O3 in the presence of H2 as the reductant. In addition, it has been found that CO is formed as a result of the photoreduction of CO2 in the presence of CH4 as a substitute for H2 over ZrO2 and MgO. In this study, we reported that various metal oxides exhibit the photocatalytic activity for the photoreduction of CO2 in the presence of H2.