La的掺杂方式对CeO_2-MnO_x催化氧化氯苯性能的影响  

Influence of different La doping methods on performance of CeO_2-MnO_x catalysts for chlorobenzene oxidation

作　　者：李培[1] 李经纬[1] 刘善堂[1] 

机构地区：[1]武汉工程大学化工与制药学院绿色化工过程教育部重点实验室,湖北武汉430074

出　　处：《工业催化》2013年第3期23-26,共4页Industrial Catalysis

基　　金：国家自然科学基金(20873097;21071113)资助项目;湖北省自然科学基金(2011CDA049)资助项目;湖北省科技厅国际合作项目(2012IHA00201)

摘　　要：采用共沉淀法制备CeO2-MnOx和La2O3-CeO2-MnOx催化剂,再用沉积-沉淀法制备La2O3/CeO2-MnOx催化剂,并对催化剂的氯苯催化氧化反应活性进行检测。结果表明,La的加入可以显著提高催化剂催化氧化氯苯的活性。XRD和TPR表征结果表明,La的加入抑制CeO2晶粒尺寸的长大,增强CeO2的晶格应变,并促进Mn进入CeO2的晶相,形成较好的MnCeOx固溶体。催化剂的热稳定性评价结果表明,La的加入有效提高CeO2-MnOx催化剂的热稳定性。CeO2-MnOx and La203-CeOa-MnOx catalysts were prepared by the co-precipitation method,and LaEO3/CeO2-MnOx catalyst was prepared by the deposition-precipitation method. Their catalytic activity for chlorobenzene oxidation were investigated. The results showed that doping La in CeO2-MnOx could im- prove its catalytic activity of the catalyst for chlorobenzene oxidation. The results of XRD and TPR analysis indicated that the presence of La in CeO2-MnOx not only restrained the growth of CeO2 crystalline grains and enhanced the microstrain of CeO2 crystal lattice, but promoted Mn ions incorporation in CeO2 lattice and formed a homogeneous MnCeOx solid solution as well. The results of thermal stability evaluation of the catalyst illustrated that doping La in CeO2-MnOx catalyst could effectively improve its thermal stability.

关 键 词：催化化学 LA CeO2-MnOx 氯苯 催化氧化 热稳定性 

分 类 号：O643.36[理学—物理化学] TQ426.6[理学—化学]