Abstract
Photoreduction of gaseous carbon dioxide to carbon monoxide with hydrogen over Rh-loading TiO 2 was investigated. As the reaction proceeded even in the dark but was enhanced under irradiation, the reaction should be considered as “photo-enhanced reaction”. When Rh in Rh/TiO 2 was strongly reduced to be in a fully metallic state, the activity was lowered and the main product changed from CO to CH 4. A similar effect was obtained by changing the loading amount of Rh: when the loading amount of Rh was raised, the activity was lowered and the main product shifted from CO to CH 4. The results of an X-ray absorption spectroscopic analysis showed that the ratio of Rh in a metallic state to that in an oxidized stale increased along with the increase of the amount of Rh loading on Rh/TiO 2. The photocatalytic activity was higher as Rh was richer in the component of metallic and oxidized state.
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