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Citation: Yun Wang, Hongyan Shang, Haidi Xu, Maochu Gong, Yaoqiang Chen. Effects of ZnO content on the performance of Pd/Zr0.5Al0.5O1.75 catalysts used in lean-burn natural gas vehicles[J]. Chinese Journal of Catalysis, ;2014, 35(7): 1157-1165. doi: 10.1016/S1872-2067(14)60062-0 shu

Effects of ZnO content on the performance of Pd/Zr0.5Al0.5O1.75 catalysts used in lean-burn natural gas vehicles

  • 1.

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

  • Corresponding author: Yaoqiang Chen, 
  • Received Date: 14 December 2013
    Available Online: 21 February 2014

    Fund Project:

  • Mixed oxides obtained by adding varying amounts of ZnO into Zr0.5Al0.5O1.75 were used as supports to prepare 1.5% Pd catalysts. The catalyst activity and H2O tolerances of the catalysts were evaluated in a gas mixture simulating the exhaust of lean-burn natural gas-fueled vehicles. The catalysts were further characterized by N2 adsorption-desorption, X-ray diffraction, H2 temperature programmed reduction and X-ray photoelectron spectroscopy. The catalytic activity was greatly influenced by ZnO contents in Zr0.5Al0.5O1.75 support. The catalyst containing 15% ZnO exhibited a light-off temperature and complete conversion temperature for CH4 in the absence of H2O of 278 and 314℃, respectively; while these same values in the presence of H2O were 342 and 371℃, respectively. These results indicate that this combination of materials offers excellent catalytic activity at low temperature and also exhibits significant H2O tolerance.
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