纳米锐钛矿TiO2及负载金催化剂的制备与催化性能

Preparation and Catalytic Performance of Nano-anatase Titania and Supported Gold Catalysts

通过简单的水解-沉淀法制备了纳米TiO2,考察了反应条件对其粒径和晶型的影响。结果表明制备小粒径锐钛矿TiO2的有利条件为:倒加法;Ti(OBu)4与C2H5OH、H2O与C2H5OH和Ti(OBu)4与H2O的体积比分别为1/3、1/4和1/1;pH=7和400℃焙烧。沉积-沉淀法制备的Au/TiO2催化剂催化CO氧化结果表明,催化剂的活性受焙烧温度影响很大,200℃焙烧的催化剂具有最好的催化活性。

Nano titania was synthesized by a simple approach, hydrolyzation-precipitation method. The effects of preparation conditions on particle size and crystalline structure of titania were studied. The optimum conditions to prepare nano-anatase titania with small particle size were converse addition method, V[Ti （OBu）4 ]/V（C2 H5 OH）= 1/3, V（Hz O）/V（C2 H5 OH） = 1/4, V[-Ti（OBu） 4 ]/V（H2O） = 1/1, pH= 7 and calcination of 400~C. The gold/titania （anatase） catalysts for low-temperature CO oxidation were prepared by the deposition-precipitation method. The activity was markedly affected by the calaination temperature and the catalyst calcined at 200℃ showed the best catalytic performance.