【摘要】 本文报道了TiO₂及其各种担载过渡金属的M/TiO₂粉末催化剂对稀乙醇水溶液（3—5％）的光催化氧化同时放H₂的活化,提出一种新的可能的机理,讨论了催化剂表面性质、乙醇浓度和反应温度对光催化氧化的影响,比较了空气气氛和Ar气氛两种体系的光催化效率,得到反应产物氢醛比接近理论计量比的结果。更多还原

【Abstract】 In this paper, activity of photocatalytic oxidation to acetaldehyde with concurrent hydrogen evolution from diluted aqueous solution of ethanol on suspended supported pho-tocatalysts M/TiO2 (M = Pd, Pt, Cu, Fe and W) prepared by hydrolysis of TiCl, with the corresponding transition metal was reported. A new probable reaction mechanism different from the literatures for photocatalysts Pd/TiO2 and Pt/TiO2 was proposed. The effect of surface area, pretreatment by H2 at high temperature, concentration of ethanol and reaction temperature on photocatalytic oxidation has been discussed. A detailed comparison of the results between closed (in Ar atmosphere) and open (contact with air) system was made. The ratio of hydrogen to acetaldehyde near the theoretical value was obtained.更多还原