用共浸渍法制得了Pt-Rh-Pd/CeO2-La2O3/Al2O3催化剂,采用X射线衍射(XRD)对催化剂进行表征,使用配气测试系统对催化剂的活性进行评价。正交试验结果表明,对CO的氧化,恒择最佳催化剂的配比为Pt-Rh-Pd 0.1%,CeO25%,La2O34%,对NO的还原,其最佳配比为Pt-Rh-Pd 0.1%, CeO24%,La2O34%。稀土氧化物(La2O3、CeO2)作为助剂,能改善Pt-Rh-Pd/CeO2-La2O3/Al2O3催化剂的催化性能,但不能起主要作用。
The Pt-Rh-Pd/CeO2-La2O3/Al2O3 catalysts were prepared with method of co-impregnation, and characterized by X-ray diffraction (XRD). Its catalytic activities were evaluated bygas mixing test system. The results of orthogonal experimentsshowed that the best catalyst formula is Pt-Rh-Pd 0.1%, CeO25%, La2O34% to the oxidation of carbon monoxide, while to the reduction of NO, the best catalyst formula is Pt-Rh-Pd 0.1%, CeO24%, La2O34%. Rare earth oxides (La2O3, CeO2) as co-catalyst, only can improve catalytic ability of Pt-Rh-Pd/CeO2-La2O3/Al2O3, but do not play critical roles.
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