Pd/La0.8Ce0.2MnO3/ZSM-5的制备及其甲苯催化燃烧活性

王永强; 肖丽; 孙启猛; 赵朝成; 李石

Pd/La_0.8Ce_0.2MnO₃/ZSM-5的制备及其甲苯催化燃烧活性

中国石油大学(华东) 化学工程学院, 山东青岛 266555

基金项目: 国家自然科学基金（51202294）；中央高校基本科研业务费专项资金（24720142054A）；中国石油大学（华东）研究生自主创新项目（13CX06054A）。

详细信息

通讯作者:
王永强，Tel：13668868046，E-mail：wyqupc@163.com。

中图分类号: X131.1
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出版历程
- 收稿日期: 2014-02-10
- 修回日期: 2014-05-10
- 刊出日期: 2014-09-30

Preparation of the Pd/La_0.8Ce_0.2MnO₃/ZSM-5 catalyst and its performance in catalytic combustion of toluene

College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266555, China

摘要

摘要: 以贵金属改性的钙钛矿为活性组分，通过等体积浸渍法制备了Pd/La_0.8Ce_0.2MnO₃/ZSM-5催化剂，并采用XRD、BET、SEM和H₂-TPR等技术对催化剂进行了表征。在固定床反应器上，对Pd/La_0.8Ce_0.2MnO₃/ZSM-5催化剂上的甲苯为目标污染物的催化燃烧进行了研究，考察了焙烧温度、负载量及ZSM-5的性质对其催化活性的影响。结果表明，所得到Pd/La_0.8Ce_0.2MnO₃催化剂仍保持钙钛矿型结构，Pd均匀的分布在催化剂表面，有利于催化剂活性的提高。当ZSM-5硅铝原子比为25、La_0.8Ce_0.2MnO₃负载量为20%、焙烧温度为750℃时，La_0.8Ce_0.2MnO₃/ZSM-5上甲苯的起燃温度和完全转化温度分别为200和279℃；加入0.3%的Pd后，Pd/La_0.8Ce_0.2MnO₃/ZSM-5的催化活性明显提高，甲苯起燃温度下降了90℃，完全转化温度可低至230℃。
- 挥发性有机物 /
- 钙钛矿 /
- 钯 /
- 催化燃烧 /
- 甲苯 /
- 分子筛
Abstract: Pd/La_0.8Ce_0.2MnO₃/ZSM-5 catalysts were prepared by incipient wetness impregnation and characterized by nitrogen physical adsorption, X-ray diffraction (XRD), scanning electron microscope (SEM), and temperature-programmed reduction (H₂-TPR). The catalytic combustion of toluene as a target pollutant over the Pd/La_0.8Ce_0.2MnO₃/ZSM-5 catalysts was investigated in a fixed-bed reactor and the effect of calcination temperature, active component loading and ZSM-5 properties on the catalytic performance was investigated. The results indicated that the Pd/La_0.8Ce_0.2MnO₃/ZSM-5 preserves the perovskite structure and the active Pd component is evenly dispersed on the catalyst surface, which endures the catalyst with high activity in toluene combustion. Over the La_0.8Ce_0.2MnO₃/ZSM-5 catalyst with La_0.8Ce_0.2MnO₃ loading of 20%, ZSM-5 Si/Al atomic ratio of 25, and calcination temperature of 750℃, the ignition and complete combustion temperatures for toluene combustion are only 200 and 279℃, respectively. After being modified with 0.3% Pd, the activity of the Pd/La_0.8Ce_0.2MnO₃/ZSM-5 catalyst is even largely enhanced; over it, the ignition temperature for toluene combustion is decreased by 90℃ and complete combustion is achieved at 230℃.
- volatile organic compounds /
- perovskite /
- palladium /
- catalytic combustion /
- toluene /
- molecular sieve

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