Development of Photocatalysts for CO2 Reduction and Selective CO Oxidation and Monitoring of the Mechanism by Selective Spectroscopy

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As one of the options to reduce carbon dioxide, photoreduction of CO_2 to fuels using natural light contributes to the problems of both global warming and energy shortage. In this study, it was found that methanol and carbon monoxide (CO) were synthesized from CO_2 and H_2 when synthetic clays (layered double hydroxides) consisting of Zn, Cu, and Ga were irradiated by UV-visible light. It was suggested that CO_2 and surface hydroxy reacted to form hydrogen carbonate (HC) and that the HC reacted with electrons generated by irradiation of clay layers to form CO and methanol.