催化学报 ›› 2014, Vol. 35 ›› Issue (7): 1157-1165.DOI: 10.1016/S1872-2067(14)60062-0

• 论文 • 上一篇    下一篇

ZnO添加量对Pd/Zr0.5Al0.5O1.75催化剂净化稀燃天然气汽车尾气性能的影响

王云a,b, 尚鸿燕a,b, 徐海迪b, 龚茂初b, 陈耀强a,b   

  1. a. 四川大学化学工程学院, 四川成都610064;
    b. 四川大学化学学院绿色化学与技术教育部重点实验室, 四川成都610064
  • 收稿日期:2013-12-14 修回日期:2014-02-21 出版日期:2014-06-28 发布日期:2014-06-28
  • 通讯作者: 陈耀强
  • 基金资助:

    国家自然科学基金(21173153).

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

Yun Wanga,b, Hongyan Shanga,b, Haidi Xub, Maochu Gongb, Yaoqiang Chena,b   

  1. a. College of Chemical Engineering, Sichuan University, Chengdu 610064, Sichuan, China;
    b. Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2013-12-14 Revised:2014-02-21 Online:2014-06-28 Published:2014-06-28
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21173153).

摘要:

以掺杂不同含量ZnO的Zr0.5Al0.5O1.75为载体,制备了系列1.5%Pd催化剂.在模拟稀燃天然气汽车尾气条件下,测试了催化剂的活性和抗水性,并用N2吸附-脱附、X射线衍射、H2程序升温还原和X射线光电子能谱等手段对催化剂进行了系统表征.研究结果表明,ZnO的添加及添加量对催化剂的活性和抗H2O性有明显影响,其中以ZnO添加量为15%时制备的复合氧化物为载体的催化剂活性最佳.当模拟尾气中不含H2O时,该催化剂对甲烷的起燃温度(T50)和完全转化温度(T90)分别为278和314℃;在含H2O时,该催化剂的T50T90分别为342和371℃.

关键词: 锆, 铝, 锌, 钯, 复合氧化物, 稀燃, 天然气汽车, 水抑制

Abstract:

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.

Key words: Zirconium, Aluminium, Zinc, Palladium, Mixed oxide, Lean-burn, Natural gas fuelled vehicles, Water inhibition