Photocatalytic reduction of high pressure carbon dioxide using TiO2 powders with a positive hole scavenger

The photocatalytic reduction of high pressure CO2 using Ti02 powders with a positive hole scavenger has been reported. The Ti02 powders suspended in iso-propyl alcohol solution were irradiated with a Xe lamp. The main reduction product from CO2 by photocatalytic reduction was methane. Iso-propyl alcohol acted as the positive hole scavenger. Under the optimum experimental conditions, 1.3 μmol・ (g-Ti)-1 of methane was obtained by the photochemical reduction of high pressure CO2, corresponding to 0.43 μmol ・ (g-Ti)-1 h-1 of the formation rate. The C02-reduction system developed may become of practical interest for the efficient C02-conversion and fixation system, storage of solar energy and the production of raw materials for the photochemical industry