A New Type of Photocatalysis Initiated by Photoexcitation of Adsorbed Carbon Dioxide on ZrO2 |
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| Authors: | Satohiro Yoshida and Yoshiumi Kohno |
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| Institution: | (1) Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Yoshida Hon-machi, Sakyo-ku, Kyoto, 606-8501, Japan |
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| Abstract: | ZrO2 has been found to be an effective photocatalyst for reduction of CO2 by hydrogen or methane at room temperature. The effective photon energy is less than the band gap energy of ZrO2 (5.0 eV), indicating that photoexcitation of bulk ZrO2 is not involved. The reaction is initiated by photoexcitation of surface carbonates derived from adsorption of CO2 to convert it to a CO2
– radical, which in turn reacts with hydrogen or methane to form surface formate. The formate is stable at temperatures below 573 K, but works as a reductant of CO2 under photoirradiation. A new type of reaction mechanism is proposed. |
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| Keywords: | photoreduction of CO2 ZrO2 CO2 anion radical surface formate |
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