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

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,,

1.
a College of Chemical Engineering, Sichuan University, Chengdu 610064, Sichuan, China;

Corresponding author: Yaoqiang Chen,
Received Date: 26 January 2014
Available Online: 21 March 2014
Fund Project:

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