采用超声辅助膜扩散还原法(UAMR)和等体积浸渍法(IMP)制备了Rh/γ-Al2O3和Rh-Au/γ-Al2O3催化剂,考察了它们的三效模型反应(CO+O2,C3H8+O2,CO+NO和C3H6+NO+O2)活性.H2-O2滴定和透射电镜结果表明,UAMR法制得的Rh/γ-Al2O3和Rh-Au/γ-Al2O3催化剂的金属分散度分别为45.3%和40.1%,金属粒子表面积分别为199.6和133.0m2/g,金属粒子平均粒径小于3 nm.对于三效模型反应,与IMP法制备的催化剂相比,UAMR法制备的Rh/γ-Al2O3和Rh-Au/γ-Al2O3具有更高的初始活性,其中后者的活性也高于或接近于IMP法制备的Rh/γ-Al2O3催化剂.催化剂经高温老化处理后,活性均有所下降.UAMR是一种新颖的负载型纳米催化剂的制备方法,具有潜在的应用前景.
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