直接合成过氧化氢Pd/TiO_2催化剂的制备

Preparation of Pd/TiO_2 catalyst for direct synthesis of hydrogen peroxide

常温和常压下,氢氧直接合成过氧化氢过程中,采用浸渍沉淀法制备Pd/TiO_2催化剂。考察了pH、搅拌时间t_1、静置时间t_2及焙烧温度等制备条件对催化剂活性的影响。正交实验结果表明,影响催化剂活性的顺序为:pH>搅拌时间>焙烧温度>静置时间。在pH=8、t_1=0、t_2=0和(250～300)℃焙烧3 h的条件下,制备的催化剂活性最好。

Hydrogen peroxide was synthesized from H2 and 02 at room temperature and atmospheric pres- sure over Pd/TiO2 catalyst prepared by impregnation-precipitation. The effects of pH value, stirring time t1, static time t2 and calcination temperature on activity of the catalyst were investigated via orthogonal experiment with influential order as follows ： pH value 〉 stirring time t1 〉 calcination temperature 〉 static time t2. Catalyst with the optimum activity was prepared under the condition of pH = 8, t1 = 0, t2 = 0 and calcination at （250 -300） ℃ for 3 hours.