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

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T50和T90分别为342和371℃....

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Bibliographic Details
Published in催化学报 Vol. 35; no. 7; pp. 1157 - 1165
Main Author 王云 尚鸿燕 徐海迪 龚茂初 陈耀强
Format Journal Article
LanguageChinese
Published 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%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 2014
四川大学化学工程学院，四川成都610064
Subjects
复合氧化物
天然气汽车
水抑制
稀燃
钯
铝
锆
锌
Natural gas fuelled vehicles
锆
复合氧化物
Aluminium
Palladium
Water inhibition
锌
稀燃
Zinc
Mixed oxide
钯
Zirconium
天然气汽车
Lean-burn
水抑制
铝
Online AccessGet full text
ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(14)60062-0|

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Summary: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T50和T90分别为342和371℃.
Bibliography:Zirconium;Aluminium;Zinc;Palladium;Mixed oxide;Lean-burn;Natural gas fuelled vehicles;Water inhibition
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 pro-grammed 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 significa
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(14)60062-0|