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Citation: LI Feng-Yi, HU Jin-Zhao, SHI Qiu-Jie. Effects of Ni on the Activity of Pd-La-Ce Automotive Exhaust Catalysts[J]. Chinese Journal of Applied Chemistry, ;2003, 20(11): 1052-1056. shu

Effects of Ni on the Activity of Pd-La-Ce Automotive Exhaust Catalysts

1.
Institute of Applied Chemistry, Nanchang University, Nanchang 330047

Corresponding author: LI Feng-Yi,
Received Date: 29 December 2002
Available Online: 13 May 2003
Fund Project: 国家"八六三"项目(8637150030130) (8637150030130)

Ni/La-Ce-Al₂O₃, Pd/La-Ce-Al₂O₃, Pd/Ni/La-Ce-Al₂O₃ catalysts were prepared with cordierite (2MgO·2Al₂O₃·5SiO₂)as support by impregnation method. The influence of Ni on the catalytic activity of the catalysts(ω(Pd)=0.08%)for control of automotive exhausts was studied by TPR, CO-TPD, O₂-TPD, C₃H₆-TPD. The activity of the catalysts in reduction of NO and oxidation of C₃H₈ and CO was found to be increased in the order Pd/Ni/La-Ce-Al₂O₃ >Pd/La-Ce-Al₂O₃ >Ni/La-Ce-Al₂O₃. It is suggested that single Ni is low in activity, but being a promotor, it increase the activity of Pd/La-Ce-Al₂O₃. The decrease of the conversion temperature(T_100%)of NO, CO and C₃H₈ in mentioned reactions over this catalyst was <10℃, 10℃ and 50℃ respectively. Meanwhile, Ni also decreases the reduction temperature of oxygen species in catalyst and the desorption temperature of CO, but increases the desorption temperature of O₂.
- Ni,
- palladium,
- automotive emission,
- catalyst
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