贵金属负载光催化剂在丙炔光催化水解反应中的研究(Ⅲ)

A Study of Loaded Photocatalysts with Precious Metal on the Photocatalytic Hydrolysis Reaction of Propyne(Ⅲ)

利用三种不同负载方法制备了含有不同贵金属的 Ti O2 光催化剂 ,通过测试其 XPS和光催化活性和选择性发现 ,Ti O2 光催化剂在丙炔和水的光催化水解反应中 ,由于贵金属的存在 ,有利于促进发生加氢反应 ,导致丙烯的生成量增加 .Pt,Ru,Rh,Pd和 Ag负载在 Ti O2 上 ,在紫外线照射下 ( λ>2 70 nm) ,Pd负载的 Ti O2 光催化剂表现出最高的光催化活性 .光催化活性和负载贵金属所处的氧化状态有密切的关系 ,贵金属完全被还原到 0价是提高光催化活性的必要条件 .

Three different loaded methods were used to prepare photocatalysts with different precious metals. Their photocatalytic reactivities and selectivities were measured by XPS spectra. It was found from the experimental results that the precious metals existing on TiO 2 photocatalysts could promote of hydrogenation reaction in photocatalytic hydrolysis of propyne, and made the yield of propene product increasing. Among the titanium oxides loaded with Pt, Ru, Rh, Pd and Ag, the photocatalyst loaded with Pd had the highest photocatalytic reactivities under UV light(λ>270 nm) irradiation. The photocatalytic reactivities are closely related to the oxidation state of precious metals and it is necessary to make the valence of precious metals be reduced to 0 valence for increasing photcatalytic reactivities.