模板剂合成锰八面体分子筛及其催化燃烧二甲醚的性能研究  

Preparation of OMS-2 modulated by ionic liquid and its application in catalytic combustion of dimethyl ether

作　　者：孙明[1] 余林[1] 余倩[1] 余坚[1] 郝志峰[1] 李朝圣[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《功能材料》2008年第10期1746-1749,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20203012);广东省科技计划资助项目(2005B10201053);广东省自然科学基金团队资助项目(4205301);广东省高等学校自然科学研究重点资助项目(06Z011);广州市科技计划资助项目(2006J1-C0501);广东工业大学新进科研基金资助项目(XJ200604)

摘　　要：以离子液体[bmin]NO3调控的溶胶凝胶法合成了氧化锰八面体分子筛(OMS-2),并采用TG-DSC、XRD、低温N2吸附、TEM、FT-IR、UV-vis、O2-TPD以及H2-TPR等方法对固体材料的结构进行了表征,考察了制备材料的二甲醚催化燃烧反应的催化性能。结果表明,合成的OMS-2材料属于cryp-tomelane一维隧道结构,由于离子液体同时作为模板导向剂和还原剂,因而使得OMS-2的外形以一维纳米线为主。O2-TPD和H2-TPR实验表明,OMS-2材料具有丰富的氧物种,低温下易还原,因而在二甲醚催化燃烧中表现出了良好的催化性能。二甲醚催化燃烧的起燃温度T10%为180℃,而完全燃烧温度T90%为190℃,反应产物仅有CO2和H2O。Manganese oxide octahedrat molecular sieves （OMS-2） were synthesized by sol-gel method with KM- nO4 and maleic as raw materials and ionic liquid, namely [bmim]NO3, as template. The structure of the catalyst was characterized by XRD, N2 adsorption, TEM,FT-IR,UV-vis,O2-TPD and H2-TPR techniques. Its catalytic activity in dimethyl ether（DME） combustion was also evaluated. The results showed that the prepared catalyst has the typical cryptomelane structure with a one dimensional channel. The ionic liquid works as a structure-directing agent and reducing agent, which leads to the transformation of the OMS-2 structure from nano-particle to nanorod. The catalyst showed excellent activity for DME catalytic combustion with a ignition temperature （T10%） 180℃ and a complete combustion temperature （T90%） 190℃. This excellent performance is owed to the abundant facile lattice oxygen, and the easy of reduction, which were proved by O2-TPD and H2- TPR characterization.

关 键 词：氧化锰 八面体分子筛 模板剂 二甲醚 催化燃烧 

分 类 号：O643[理学—物理化学]