Chem.J.ChineseUniversities,2023,44(2),2022053220220532(1/8)CHEMICALJOURNALOFCHINESEUNIVERSITIES高等学校化学学报研究论文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宋佳欣1,2,崔静1,范晓强1,孔莲1,肖霞1,解则安1,赵震1,2(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)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-VisDRS)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.关键词钒基催化剂;高分散活性位;乙烷;选择氧化;乙烯和乙醛中图分类号O643.3文献标志码Adoi:10.7503/cjcu20220532PreparationofMesoporousSilicaSupportedHighlyDispersedVanadiumCatalystandTheirCatalyticPerformanceforSelectiveOxidationofEthaneSONGJiaxin1,2,CUIJing1,FANXiaoqiang1*,KONGLian1,XIAOXia1,XIEZean1,ZHAOZhen1,2*(1.InstituteofCatalysisforEnergyandEnvironment,CollegeofChemistryandChemicalEngineering,ShenyangNormalUniversity,Shenyang110034,China;2.StateKeyLaboratoryofHeavyOilProcessing,ChinaUniversityofPetroleum,Beijing102249,China)AbstractAseriesofmesoporoussilicasupportedvanadiumcatalystswaspreparedbyincipient-wetnessimpregna⁃tionmethodusingporoussilicawithhighspecificsurfaceareaassupport.Andthecatalyticperformancesweretestedfortheselectiveoxidationofethane.ThecatalystswerecharacterizedbyX-raydiffraction(XRD),ultraviolet-visiblediffusereflectancespectrum(UV-VisDRS)andH2-temperatureprogrammedreduction(H2-TPR).Theeffectsofvanadiumloadingsonthestructureofthecatalystwereinvestigated.ItwasfoundthatthevanadiumspeciesonthesurfaceofthecatalystschangedfromhighlydispersedoligomericVOxtohighlypolymerizedVOxwiththeincreaseofvanadiumloading.Thehighlydispersedvanadiumspeciescanimprovetheselectivityofethenea...