用于甲苯催化燃烧的Pd/Ce_(0.8)Zr_(0.2)O_2/基底整体催化剂  

Pd/Ce_(0.8)Zr_(0.2)O_2/Substrate Monolithic Catalyst for Toluene Catalytic Combustion

作　　者：张庆豹[1] 赵雷洪[1] 滕波涛[1] 谢云龙[1] 岳雷[1] 

机构地区：[1]浙江师范大学物理化学研究所浙江省固体表面反应化学重点实验室,浙江金华321004

出　　处：《催化学报》2008年第4期373-378,共6页

基　　金：浙江省自然科学基金(项目203147).

摘　　要：采用浸渍法制备了Pd/Ce0.8Zr0.2O2/基底整体催化剂,应用热重-差示扫描量热、扫描电镜、X射线衍射、氮吸附、拉曼光谱和程序升温还原等技术手段对催化剂进行了表征,考察了不同温度焙烧的整体催化剂的甲苯催化燃烧性能.结果表明,一层均匀紧密的Ce0.8Zr0.2O2涂层很好地分散在基底表面上,该涂层具有良好的抗振荡性和较高的粘结强度.400℃焙烧的Pd/Ce0.8Zr0.2O2/基底整体催化剂的催化活性最高,甲苯转化率达97%以上的最低反应温度为210℃.此外,Pd/Ce0.8Zr0.2O2/基底整体催化剂具有良好的热稳定性,这可能是因为CeO2-ZrO2固溶体的形成和高温下PdO的稳定存在.A novel Ce0.8Zr0.2O2 washcoat has been prepared by an impregnation method and used as a host for the active Pd component to prepare a Pd/Ce0.8Zr0.2O2/substrate monolithic catalyst for toluene catalytic combustion. Thermogravimetry and differential scanning calorimetry, scanning electron microscopy, X-ray powder diffraction, N2 adsorption, Raman spectroscopy, and CO temperature-programmed reduction have been used to characterize the catalyst. The washcoat is uniform and shows strong adhesion to the substrate according to an ultrasonic test. A toluene conversion of 97 % is obtained at a temperature as low as 210 ℃ over the Pd/Ce0.8Zr0.2O2/substrate monolithic catalyst calcined at 400 ℃ . The formation of CeO2-ZrO2 solid solution and the presence of the stable PdO phase at high temperatures are primarily responsible for the good thermal stability of the monolithic catalyst.

关 键 词：整体催化剂 甲苯 催化燃烧 涂层 钯 氧化铈 氧化锆 

分 类 号：O643.3[理学—物理化学]