Characterization of Pt catalysts supported by three forms of TiO2 and their catalytic activities for hydrogenation

Three forms of TiO2, commercial TiO2 powder, hydrogen titanate nanotubes obtained by hydrothermal treatment, and the thermally stable TiO2 nanotubes prepared by treating hydrogen titanate nanotubes with a sol containing titanium, were used as supports, and Pt nanoparticles were deposited on the supports via the photodeposition method. The catalytic performances of as-prepared and calcined Pt/TiO2 catalysts for the hydrogenation reaction of cyclohexene were evaluated. The results showed that the effects of the support and calcination temperature on the catalytic performances of Pt/TiO2 catalysts were obvious and significant. The thermally stable nanotubular TiO2-supported Pt catalyst exhibited better catalytic performance than the other TiO2-supported Pt catalysts. In addition, it was discovered that the calcination can enhance the catalytic activity of Pt/TiO2 for hydrogenation greatly.

使用了三种形式的二氧化钛作为载体，分别是商业二氧化钛粉末、通过水热处理获得的钛酸氢纳米管，以及用含钛溶胶处理钛酸氢纳米管制备的热稳定二氧化钛纳米管，并通过光沉积法将铂纳米粒子沉积在载体上。对所制备的以及煅烧后的Pt/TiO₂催化剂在环己烯加氢反应中的催化性能进行了评估。结果表明，载体和煅烧温度对Pt/TiO₂催化剂催化性能的影响是明显且显著的。热稳定的纳米管状二氧化钛负载的铂催化剂比其他二氧化钛负载的铂催化剂表现出更好的催化性能。此外，还发现煅烧可以极大地提高Pt/TiO₂对加氢反应的催化活性。