Co掺杂对Ce/MCM-41和Ce/SBA-15催化剂催化氧化甲苯性能的影响  

Effect of Co doping on the performance of Ce/MCM-41 and Ce/SBA-15 in toluene oxidation

作　　者：赵波 冯新建 黄国波[1] 葛昌华[1] 王勇[1] Zhao Bo;Feng Xinjian;Huan Guobo;Ge Changhua;Wang Yong(Taizhou University,Taizhou 318000,Zhejiang,China;Zhejiang xingyu auto parts Co.Ltd.,Taizhou 318000,Zhejiang,China)

机构地区：[1]台州学院,浙江台州318000 [2]浙江兴宇汽车零部件有限公司,浙江台州318000

出　　处：《工业催化》2018年第2期48-55,共8页Industrial Catalysis

基　　金：国家自然科学基金资助项目(21671146);台州市科学技术局资助项目(162gy48);湖州市南太湖精英计划创新团队资助项目;浙江达峰汽车技术有限公司资助项目

摘　　要：以分子筛为载体,采用等体积浸渍法制备Ce/SBA-15、Ce/MCM-41、Ce Co/SBA-15和Ce Co/MCM-41催化剂。用N2吸附-脱附、X射线衍射、扫描电子显微镜、H2程序升温还原、X射线光电子能谱和傅立叶变换红外光谱等对载体和催化剂进行表征,并考察催化剂催化氧化甲苯的活性。结果表明,与载体相比,随着Ce和Co的浸渍,催化剂的比表面积和孔容下降,但仍然保持了载体的有序介孔结构。引入的Ce和Co没有进入分子筛骨架,而是以立方相固溶体形式存在于分子筛表面和孔道中。催化剂催化氧化甲苯活性顺序依次为:Ce Co/SBA-15>Ce Co/MCM-41>Ce/MCM-41>Ce/SBA-15。共浸渍Ce和Co的催化剂活性明显优于只浸渍Ce的催化剂,活性与其还原性能直接相关,Ce Co/SBA-15催化剂具有最低的还原温度和最好的供氧能力,从而表现出最优的催化性能。Ce/SBA-15,Ce/MCM-41,CeCo/SBA-15,Ce/MCM-41 were prepared by incipient wetness impregnation and tested in toluene oxidation.Supports andcatalysts were characterized by N 2 adsorption desorption,X-ray diffraction,scan electron microscopy,hydrogen temperature-programmed reduction,X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy.Compared with support,surface area and pore volume of the catalysts decreased with the impregnation of Ce and Co,the mesoporous structure of support still maintained simultaneously.The introduced Ce and Co did not enter the framework of the zeolite,but existed in the form of cubic solid solution on the surface and pore of the molecular sieve.The results showed that the catalysts impregnated by Ce and Co had better activity than catalysts impregnated by Ce only.The order of catalytic activity for tolueneoxidation was CeCo/SBA-1>CeCo/MCM-41>Ce/MCM-41>Ce/SBA-15.Reduction nature affects significantly toluene oxidation performance of different catalysts.CeCo/SBA-15 had the best catalytic activitybecause of the lowest reduction temperature andthe best oxygen supply capacity.

关 键 词：催化化学 MCM-41 SBA-15 掺杂 甲苯 催化氧化 

分 类 号：O643.36[理学—物理化学] TQ426.99[理学—化学]