水热法制备SnO_2纳米颗粒的CO氧化性能  

CO Oxidation Performance over SnO_2 Nanoparticles Prepared with Hydrothermal Method

作　　者：柴澍靖 李静[1] 白雪芹 李新刚[1] Chai Shujing Li Jing Bai Xueqin Li Xingang(School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, Chin)

机构地区：[1]天津大学化工学院天津市应用催化科学与工程重点实验室,天津300354

出　　处：《化学工业与工程》2017年第5期19-24,共6页Chemical Industry and Engineering

基　　金：国家自然科学基金(U1232118;21476159)

摘　　要：针对日益严重的CO污染问题,通过在制备过程中引入CTAB模板,采用水热法对SnO_2催化剂的形貌结构进行控制。同时采用X射线衍射(XRD)、透射电镜(TEM)、N_2吸附(BET)、热重分析(TGA)以及H_2程序升温还原(H_2-TPR)等技术对SnO_2催化剂的结构及氧化还原能力进行表征,并考察了其催化CO氧化活性。结果表明:水热法合成的SnO_2催化剂为纳米颗粒状,具有高比表面积、均一粒径、分布均匀等特点,表面Sn^(4+)浓度高于沉淀法制备的SnO_2催化剂,并且表现出了更加优异的CO氧化活性,表观活化能(Ea)从61.3下降到54.2 kJ·mol^(-1)。In order to solve the serious problem of CO pollution,nano SnO2 catalyst was prepared with hydrothermal method.CTAB was introduced as a surfactant in the process.The morphology structure and oxidation reduction abilities of SnO2 were investigated by X-ray diffraction （XRD）,transmission electron microscopy （TEM）,N2 adsorption （BET）,thermogravimetric analysis （TGA） and temperature programmed H2 reduction （H2-TPR）,and CO oxidation activities were measured,as well.Our results show that the as-prepared SnO2 nano-particles have higher specific surface area,uniform particle size and distribution,a higher surface Sn4＋ concentration than that of the conventional SnO2 catalyst prepared with precipitation method.Results show that the nano-SnO2 catalysts possess higher activity for CO oxidation,and its Ea decreased from 61.3 to 54.2 kJ＆#183;mo1-1,as compared with the SnO2catalyst prepared with precipitation method.

关 键 词：水热法 二氧化锡 纳米颗粒 CO氧化 

分 类 号：TQ134.32[化学工程—无机化工]