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Citation: HU Wei, WANG Yun, SHANG Hong-Yan, XU Hai-Di, ZHONG Lin, CHEN Jian-Jun, NG Mao-Chu, CHEN Yao-Qiang. Effects of Zr Addition on the Performance of the Pd-Pt/Al₂O₃ Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification[J]. Acta Physico-Chimica Sinica, ;2015, 31(9): 1771-1779. doi: 10.3866/PKU.WHXB201507141 shu

Effects of Zr Addition on the Performance of the Pd-Pt/Al₂O₃ Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification

HU Wei ¹ ,
WANG Yun ¹ ,
SHANG Hong-Yan ¹ ,
XU Hai-Di ^2,3 ,
ZHONG Lin ^1, ,
CHEN Jian-Jun ² ,
NG Mao-Chu ² ,
CHEN Yao-Qiang ^1,2,3,

1.
1 College of Chemical Engineering, Sichuan University, Chengdu 610064, P. R. China;
2 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, P. R. China;
3 Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China

Received Date: 4 May 2015
Available Online: 14 July 2015
Fund Project: 国家自然科学基金(21173153) (21173153) 四川省环境保护厅项目(2011HB002) (2011HB002)四川省科技厅科技支撑项目(2012FZ0008)资助 (2012FZ0008)

The catalytic activity, hydrothermal aging resistance, and sulfur tolerance of a Pd-Pt-based methane oxidation catalyst were evaluated in a fixed fluidized bed reactor containing simulated lean-burn natural gas vehicle exhaust gases. Zirconium-doped Pd-Pt/Al₂O₃ (Pd-Pt/Zr_xAl_(1-x)O_(3+x)/2) was found to significantly improve the catalytic activity, hydrothermal aging resistance, and sulfur tolerance. Zr-modified alumina supports were prepared by co-precipitation with molar ratios of Zr to Al of 0 : 1, 0.25 : 0.75, 0.5 : 0.5, 0.75 : 0.25, and 1 : 0. The Pd-Pt bimetallic catalysts containing 1.5% (w, mass fraction) Pd and 0.3% (w) Pt supported on the above-modified composite supports were prepared by the co-impregnating method. The catalysts were characterized by N₂ adsorption/desorption, X-ray diffraction(XRD), H₂ temperatureprogrammed reduction (H₂-TPR), O₂ temperature-programmed desorption, and X-ray photoelectron spectroscopy (XPS). The results show that the crystallinity of the samples, dispersion of the active component, number of Pd²⁺ species, and electron density around Pd2+ species increase after addition of ZrO₂ to Al₂O₃ supports. Compared with the activity results of Pd-Pt/Al₂O₃ and Pd-Pt/ZrO₂ catalysts after different pretreatment conditions, the performance of the catalyst is greatly enhanced by adding ZrO₂ in the Al₂O₃ supports, and Pd-Pt/Zr_0.5Al_0.5O_1.75 shows the best catalytic activity, strongest hydrothermal aging resistance, and highest sulfur tolerance among the investigated catalysts.
- Aluminum,
- Zirconium,
- Different molar ratios,
- Support,
- Natural gas fuelled vehicle,
- Catalytic performance
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Effects of Zr Addition on the Performance of the Pd-Pt/Al₂O₃ Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification