担载钒氧化物催化剂对丙烷选择氧化性能.pdf

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1、物理化学学~E(WuliHuaxueXuebao1NovemberActa．一Chim．Sin．2011，27(11)，2659-26642659[Article]www．whxb．pku．edu．cn担载钒氧化物催化剂对丙烷选择氧化性能刘坚赵震王宏宣段爱军姜桂元(中国石油大学重质油国家重点实验室，北京102249)摘要：用等体积浸渍法制备了SBA-15担载的钒基氧化物催化剂，使用X射线衍射(XRD)分析、氮气吸附、紫外激光拉曼、傅里叶变换红外(FTIR)光谱和紫外-可见漫反射(UV-VisDRS)光谱对催化剂的结

2、构进行了表征，并评价了催化剂对丙烷选择氧化的活性与选择性．实验结果表明SBA-15载体对丙烷选择氧化的活性优于常规的SiO载体．SBA一15担载的低载量催化剂是高分散的催化剂体系，在低钒载量(n(V)ln(Si)<2．5％)时，催化剂具有规则的六方介孔结构．低钒载量(n(V)ln(Si)2．5％)时，聚合六配位的钒氧化物和微晶钒氧化物是丙烷脱氢或深度氧化的活性物种．关键词：丙烷选择氧化：催化剂：SBA一15介

3、孔分子筛：担载钒氧化物：表征中图分类号：O641SelectiveOxidationPerformanceofPropaneoverSupportedVanadiumOxideCatalystsLIUJianZHAOZhenWANGHong-XuanDUANAi-JunJIANGGui—Yuan(StateKeyLaboratoryofHeavyOil,ChinaUniversityofPetroleum．Be~iing102249,PR．China)Abstract：AseriesofSBA．15supposed

4、vanadiumoxidecatalystswithdiferentactivecomponentswerepreparedbythemethodofincipient-wetimpregnation．ThestructuresofthecatalystswerecharacterizedbyN2adsorption，X-raydi仟raction(XRD)，ultraviolet(uv)一Raman，Fouriertransforminfrared(FTIR)，andultraviolet．visblediflu

5、sereflectancespectroscopy(UV_VjsDRS)techniques，andtheircatalyticperformancesfortheselectiveoxidationofpropanewereinvestigated．TheresultsshowedthatSBA-15wasabefersuppodinthecatalystsystemthanSiO2fortheselectiveoxidationofpropanetoaldehydes．TheSBA一15supposedlowl

6、oadingcatalystisahighlydispersedcatalystsystemandtheSBA一15suppodedvanadiumoxidesampleswithlowloading(n(V)ln(Si)<2．5％)haveorderedhexagonalmesostructures．FortheV0Ix／SBA-15catalysts．isolatedvanadylspecieswithtetrahedralCO0rdinationaretheactivesitesforaldehydeform

7、ationatverylowIoadingsofvanadium(n(V)ln(Si)

8、rds：Selectiveoxidationofpropane；Catalyst；SBA-15mesoporousmolecularsieveSuppoRedvanadiumoxide；CharacterizationReceived：June7，201l；Revised：August8，20l1：PublishedonWeb：August31．2011．’