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This study investigated the impact of molar ratio of COto reductants HO and H, as well as Pd loading weight on COreduction performance with Pd/TiOas the photocatalyst. The Pd/TiOfilm photocatalyst is prepared by the sol-gel and dip-coating process to prepare TiOfilm and the pulse arc plasma method is used to dope Pd on TiOfilm. The prepared Pd/TiOfilm was characterized by SEM, EPMA, STEM, EDS, and EELS. This study also investigated the performance of COreduction under the illumination condition of Xe lamp with or without ultraviolet (UV) light. As a result, it is revealed that when the molar ratio of CO/H/HO is set at 1:0.5:0.5, the best COreduction performance has been obtained under the illumination condition of Xe lamp with and without UV light. In addition, it is found that the optimum Pd loading weight is 3.90 wt%. The maximum molar quantities of CO and CHproduced per unit weight of photocatalyst are 30.3 μmol/g and 22.1 μmol/g, respectively, for the molar ratio of CO/H/HO = 1:0.5:0.5 under the condition of Xe lamp illumination with UV light. With UV light, Cand C, as well as CO and CHare also produced by the Pd/TiOfilm photocatalyst prepared in this study. View Full-Text