介孔二氧化硅负载高分散钒催化剂的制备及乙烷选择氧化性能  

Preparation of Mesoporous Silica Supported Highly Dispersed Vanadium Catalyst and Their Catalytic Performance for Selective Oxidation of Ethane

作　　者：宋佳欣 崔静 范晓强 孔莲 肖霞 解则安 赵震 SONG Jiaxin;CUI Jing;FAN Xiaoqiang;KONG Lian;XIAO Xia;XIE Zean;ZHAO Zhen(Institute of Catalysis for Energy and Environment,College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China)

机构地区：[1]沈阳师范大学化学化工学院,能源与环境催化研究所,沈阳110034 [2]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《高等学校化学学报》2023年第2期79-86,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:91845201,22172101,92145301);辽宁省教育厅科学研究经费项目(批准号:LQN202009);沈阳师范大学优秀人才基金和沈阳师范大学重大项目孵化工程项目(批准号:ZD201901)资助。

摘　　要：以高比表面积的介孔二氧化硅为载体,采用等体积浸渍法制备了一系列介孔二氧化硅负载钒催化剂,并探究了其乙烷选择氧化反应性能.利用X射线衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)和氢气程序升温还原(H2-TPR)等方法对催化剂的物化性质进行了表征,研究了钒负载量对催化剂结构特征的影响.结果表明,随着钒负载量的增加,钒物种在催化剂表面的存在形式由高分散低聚的VOx转变为高聚的VOx,其中高分散钒物种有利于提高目标产物乙烯和乙醛的选择性.A series of mesoporous silica supported vanadium catalysts was prepared by incipient-wetness impregna⁃tion method using porous silica with high specific surface area as support.And the catalytic performances were tested for the selective oxidation of ethane.The catalysts were characterized by X-ray diffraction(XRD),ultraviolet-visible diffuse reflectance spectrum(UV-Vis DRS)and H2-temperature programmed reduction(H2-TPR).The effects of vanadium loadings on the structure of the catalyst were investigated.It was found that the vanadium species on the surface of the catalysts changed from highly dispersed oligomeric VOx to highly polymerized VOx with the increase of vanadium loading.The highly dispersed vanadium species can improve the selectivity of ethene and acetaldehyde.

关 键 词：钒基催化剂 高分散活性位 乙烷 选择氧化 乙烯和乙醛 

分 类 号：O643.3[理学—物理化学]