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.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期373-378,共6页
基金
浙江省自然科学基金(项目203147).
关键词
整体催化剂
甲苯
催化燃烧
涂层
钯
氧化铈
氧化锆
monolithic catalyst
toluene
catalytic combustion
washcoat
palladium
ceria
zirconia
