铈锰氧化物对二氯甲烷催化氧化性能的研究  

Catalytic Oxidation of Dichloromethane over Ce_(1-x)Mn_xO_2 Catalysts

作　　者：曾春云[1] 马瑞红[1] 刘雪松[1] 罗孟飞[1] 鲁继青[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省部共建教育部重点实验室,浙江金华321004

出　　处：《中国稀土学报》2010年第3期306-310,共5页Journal of the Chinese Society of Rare Earths

基　　金：浙江省科技计划项目(2008C21020)资助

摘　　要：采用溶胶-凝胶法制备了系列Ce1-xMnxO2催化剂,运用BET,XRD,Raman,XPS和H2-TPR等方法对催化剂进行了表征。并考察了催化剂对CH2C l2催化氧化的性能。XRD结果表明,催化剂中Ce的加入可以有效抑制催化剂晶粒变大,且有部分Mn离子进入CeO2骨架中形成了固溶体;而XPS结果表明,催化剂中Mn物种以+3和+4价存在。H2-TPR结果表明,催化剂中Ce的加入降低了MnOx中晶格氧的还原温度。反应活性结果表明,Ce1-xMnxO2系列催化剂较纯CeO2,MnOx催化活性好,其本征活性顺序为Ce0.8Mn0.2O2>Ce0.6Mn0.4O2>Ce0.5Mn0.5O2>Ce0.4Mn0.6O2>Ce0.2Mn0.8O2>CeO2>MnOx。这可能是由于Ce的添加提高了催化剂中MnOx晶格氧的活泼程度,进而影响反应性能。A series of Ce1-xMnxO2 catalysts were prepared using a sol-gel method and characterized by BET,XRD,Raman,XPS and H2-TPR techniques.These catalysts were also tested for catalytic oxidation of CH2Cl2.The XRD results indicated that the addition of Ce in the catalyst could effectively suppress the growth of the catalyst crystallite,and the solid solution was formed due to the incorporation of Mn in the CeO2 lattice.The XPS results showed that the Mn species in the catalysts were in oxidation states of ＋3 and ＋4.The H2-TPR results indicated that the addition of Ce in the catalyst lowered the reduction temperature of the lattice oxygen in MnOx species.The Ce1-xMnxO2 catalysts showed higher intrinsic reactivity compared to the CeO2 and MnOx,following the order of Ce0.8Mn0.2O2Ce0.6Mn0.4O2Ce0.5Mn0.5O2Ce0.4Mn0.6O2Ce0.2Mn0.8O2CeO2 MnOx.The enhancement of reactivity was probably due to the easier reduction of the lattice oxygen of MnOx,as indicated by the H2-TPR results.

关 键 词：二氯甲烷 催化氧化 Ce1-xMnxO2 稀土 

分 类 号：O643.32[理学—物理化学]