一个新的满足未来排放标准的摩托车尾气净化催化剂  

A new monolithic Pt-Pd-Rh motorcycle exhaust catalyst to meet future emission standards

作　　者：王苏宁[1] 崔亚娟[2] 兰丽[2] 史忠华[2] 赵明[2] 龚茂初[2] 方瑞梅[1] 陈思洁[2] 陈耀强[1,2] 

机构地区：[1]四川大学化学工程学院,四川成都610064 [2]四川大学化学学院,教育部绿色化学与技术重点实验室,四川成都6100647

出　　处：《催化学报》2014年第9期1482-1491,共10页

基　　金：国家自然科学基金(20803049;21173153)~~

摘　　要：采用共沉淀法制备Ce O2-ZrO2-La2O3-Pr O2-Al2O3复合氧化物载体材料,以浸渍法制备了Pd-Rh,Pt-Rh和Pt-Pd-Rh型整体式催化剂.用N2吸附-脱附、程序升温还原、储氧量和X射线衍射对其进行了表征,并考察了老化前后催化剂的空燃比特性、空速特性和温度特性.结果表明,在三种催化剂中,Pt-Pd-Rh型催化剂表现出更优异的性能.在40000 h-1空速下,新鲜Pt-Pd-Rh型催化剂对C3H8,CO和NO的起燃温度T50分别为239,187和191o C,ΔT(T90-T50)分别为21,3和3o C.老化后,C3H8,CO和NO的T50分别为298,203和223o C,ΔT分别为22,5和13o C,且老化前后空燃比窗口较宽,适合于未来排放标准的摩托车尾气净化.A new composite oxide material as support, CeO2-ZrO2-La2O3-PrO2-Al2O3, was synthesized by a co-precipitation method. Pd-Rh, Pt-Rh, and Pt-Pd-Rh supported on monolithic carrier catalysts were obtained by an impregnation route. The textural, structural, and reductive properties of the cata-lysts were characterized by N2 adsorption-desorption, temperature-programmed reduction, oxygen storage capacity measurements, and X-ray diffraction. The air-fuel-ratio （A/F）, space velocity （SV）, and temperature characteristics of the fresh and aged catalysts were investigated on a systematic basis. The results showed that among the three catalysts, Pt-Pd-Rh displayed the best performance. For an SV of 40000 h-1 in the case of fresh Pt-Pd-Rh, the light-off temperatures （T50） for C3H8, CO, and NO were 239, 187, and 191 ℃, respectively, with correspondingΔT （T90-T50） values of 21, 3, and 3 ℃, respectively. After aging, the T50 for C3H8, CO, and NO were 298, 203, and 223 ℃, respec-tively, and theΔT values were 22, 5, and 13 ℃, respectively. Moreover, the window widths for the A/F in the case of fresh and aged Pt-Pd-Rh catalysts were wide. Overall, the excellent performance for the Pt-Pd-Rh catalyst makes it suitable as a motorcycle exhaust catalyst, which can meet future emission standards.

关 键 词：摩托车尾气净化 整体式催化剂 铂-钯-铑 空燃比特性 空速特性 温度特性 

分 类 号：TQ426.96[化学工程]