一个新的满足未来排放标准的摩托车尾气净化催化剂

doi:10.1016/S1872-2067(14)60092-9

催化学报 ›› 2014, Vol. 35 ›› Issue (9): 1482-1491.DOI: 10.1016/S1872-2067(14)60092-9

一个新的满足未来排放标准的摩托车尾气净化催化剂

王苏宁^a, 崔亚娟^b, 兰丽^b, 史忠华^b, 赵明^b, 龚茂初^b, 方瑞梅^a, 陈思洁^b, 陈耀强^a,b

a 四川大学化学工程学院, 四川成都610064;
b 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

收稿日期:2014-01-26 修回日期:2014-03-21 出版日期:2014-08-19 发布日期:2014-08-22
通讯作者: 陈耀强
基金资助:
国家自然科学基金（20803049，21173153）.

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

Suning Wang^a, Yajuan Cui^b, Li Lan^b, Zhonghua Shi^b, Ming Zhao^b, Maochu Gong^b, Ruimei Fang^a, Sijie Chen^b, Yaoqiang Chen^a,b

a College of Chemical Engineering, Sichuan University, Chengdu 610064, Sichuan, China;
b Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China

Received:2014-01-26 Revised:2014-03-21 Online:2014-08-19 Published:2014-08-22
Supported by:
This work was supported by the National Natural Science Foundation of China (20803049, 21173153).

摘要/Abstract

摘要：

采用共沉淀法制备CeO₂-ZrO₂-La₂O₃-PrO₂-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191 ℃，ΔT （T₉₀ - T₅₀）分别为21，3和3 ℃. 老化后，C₃H₈，CO和NO的T₅₀分别为298，203和223 ℃，ΔT分别为22，5和13 ℃，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.

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

Abstract:

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 catalysts 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 corresponding ΔT (T₉₀-T₅₀) values of 21, 3, and 3 ℃, respectively. After aging, the T₅₀ for C₃H₈, CO, and NO were 298, 203, and 223 ℃, respectively, and the ΔT 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.

Key words: Motorcycle exhaust purification, Monolithic catalyst, Pt-Pd-Rh, Air-to-fuel ratio characteristic, Space velocity characteristic, Temperature characteristic

王苏宁, 崔亚娟, 兰丽, 史忠华, 赵明, 龚茂初, 方瑞梅, 陈思洁, 陈耀强. 一个新的满足未来排放标准的摩托车尾气净化催化剂[J]. 催化学报, 2014, 35(9): 1482-1491.

Suning Wang, Yajuan Cui, Li Lan, Zhonghua Shi, Ming Zhao, Maochu Gong, Ruimei Fang, Sijie Chen, Yaoqiang Chen. A new monolithic Pt-Pd-Rh motorcycle exhaust catalyst to meet future emission standards[J]. Chinese Journal of Catalysis, 2014, 35(9): 1482-1491.

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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

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