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°C；在含H2O时，该催化剂的T50和T90分别为342和371°C.
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 evaluat-ed 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 pro-grammed reduction and X-ray photoelectron spectroscopy. The catalytic activity was greatly influ-enced 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 °C, respectively; while these same values in the presence of H2O were 342 and 371 °C, re-spectively. 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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