CO₂ photoreduction is an indispensable tool to generate carbon containing fuel. A series of noble metal modified TiO₂ were prepared using photodeposition method, and their photocatalytic activities were evaluated towards photocatalytic reduction of CO₂ under gas phase conditions using water vapor as electron donor and UV-A light as energy source. TiO₂ solely produce CO. The addition of noble metals to TiO₂ via photodeposition method significantly increased the photocatalytic reduction of CO₂ with change in product selectivity towards methane under identical conditions. Further combinations of two different noble metals were simultaneously deposited to develop bimetal/TiO₂. The bimetal/TiO₂ further enhances the methane yield with considerable amount of ethane. Ag_1%Pd_1%/TiO₂ has been proven as best catalyst among all catalyst and yields maximum methane.

CO _2光还原是产生含碳燃料的必不可少的工具。采用光沉积法制备了一系列贵金属改性的TiO ₂，并以水蒸气为电子给体，以UV-A光为能源，评价了它们在气相条件下对CO ₂光催化还原的光催化活性。TiO ₂仅产生CO。在相同条件下，通过光沉积法向TiO _2中添加贵金属会显着提高CO ₂的光催化还原度，同时改变产品对甲烷的选择性。同时沉积两种不同贵金属的进一步组合以形成双金属/ TiO₂。双金属/ TiO ₂与大量的乙烷一起进一步提高了甲烷的产率。已证明Ag _1％ Pd _1％ / TiO ₂是所有催化剂中最好的催化剂，并产生最大的甲烷。