Ag-TiO_2纳米催化剂的合成、表征及环氧化催化性能

The Synthesize,Character and Epoxidation of Nanometer Ag-TiO_2 Catalyst

用溶胶 凝胶 表面活性剂法合成了Ag TiO2 纳米催化剂 ,并用FTIR、XRD、TEM、比表面测定对其进行了表征。纳米催化剂的一次粒径为 5 9纳米 ,二次粒径为 12 1纳米。实验表明 ,它对苯乙烯的H2 O2 环氧化的催化性能较好 。

The catalyst of nanometer Ag s upported on nanomter TiO_2 particles was synthesized by irradiating TiO_2collo id containing AgNO_3 solution.Its properties were characterized by IR,TEM,XRD,S BET methods.The size of catalyst particles was 12 1nm,composed by 95% TiO_2 an d 5% Ag.The experimental results showed that the catalyst of nanometer Ag suppor ted on nanomter TiO_2 improved obviously the activity and selectivity in the ep oxidation of styrene.