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OALib Journal期刊
ISSN: 2333-9721
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pd/la0.8ce0.2mno3/zsm-5的制备及其甲苯催化燃烧活性
, PP. 1146-1152
Keywords: 挥发性有机物,钙钛矿,钯,催化燃烧,甲苯,分子筛
Abstract:
？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/la0.8ce0.2mno3/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/la0.8ce0.2mno3/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/la0.8ce0.2mno3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、la0.8ce0.2mno3负载量为20%、焙烧温度为750℃时，la0.8ce0.2mno3/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/la0.8ce0.2mno3/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℃。
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