CeO_2对PdO/θ-Al_2O_3催化剂CO氧化活性和热稳定性的影响  

Effect of CeO_2 on CO Oxidation and Stability over PdO /θ-Al_2O_3 Catalyst

作　　者：王树元[1] 舒盼盼 陈玲[1] 罗孟飞[1] 

机构地区：[1]浙江师范大学物理化学研究所,先进催化材料教育部重点实验室,浙江金华321004

出　　处：《中国稀土学报》2013年第6期653-658,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(21203167)

摘　　要：以θ-Al2O3为载体,采用浸渍法制备了PdO/θ-Al2O3和PdO/CeO2/θ-Al2O3催化剂,比较了催化剂的CO氧化活性和热稳定性。运用X射线粉末衍射(XRD),程序升温还原(H2-TPR),拉曼光谱(Raman),CO化学吸附和物理吸附(BET)等技术对催化剂进行了表征。结果表明,PdO/θ-Al2O3催化剂经过1000℃焙烧后CO氧化活性较低;而PdO/CeO2/θ-Al2O3催化剂经过1000℃焙烧后CO氧化活性反而高于500℃焙烧的活性。CeO2能有效提高PdO/CeO2/θ-Al2O3催化剂的热稳定性,在10 h的稳定性实验中无失活现象发生。PdO/CeO2/θ-Al2O3-1000催化剂具有最高的转换频率(TOF=3.36 s-1)。The CO oxidation performance and thermal stability of PdO/θ-Al2O3 and PdO/CeO2/θ-Al2O3 eat- alysts prepared using θ-Al2O3 as support by impregnating method were studied. The catalysts were further characterized by X-ray diffraction （XRD）, tempera- ture-programmed reduction （TPR）, Raman technique, CO chemisorption and Brunauer-Emmett-Teller （BET）. It was found that the PdO/θ-Al2O3 catalyst calcined at 1000 ℃ showed lower activity, whereas the PdO/CeO2/0-A1203 showed higher activity than the catalysts calcined at 500 ℃. CeO2 could improve the thermal stability of PdO/CeO2/θ-Al2O3 catalyst The PdO/CeO2/θ-Al2O3-1000 catalyst had the highest turnover frequency （ TOF = 3.36 s ^- 1 ） , and showed no inactivation after 10 h reaction

关 键 词：CEO2 θ-Al2O3 CO氧化 化学吸附 热稳定性 

分 类 号：O643.36[理学—物理化学]