mcm-22分子筛的动态合成、表征、改性及烷基化催化应用

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1、北京服装学院硕士学位论文MCM-22分子筛的动态合成、表征、改性及烷基化催化应用姓名：张鑫申请学位级别：硕士专业：化学工程指导教师：傅吉全2001.12.1北京服装学院硕十学忙沦曼摘要本文研究了MCM一22分子筛的动怎合成条件，对其进行了表征。考察了改性后催化剂的酸性和结构变化，同时进行了苯与丙烯烷基化的活性评价和苯与乙烯烷基化反应的工艺实验和加速失活寿命实验。研究表明，采用工业原料六亚甲基皿胶为模板剂，在175℃(150℃)动态晶化3天(或7天)，可得到高结晶度的MCM一22分子筛。HMCM．22及改性催化剂

2、的活性均低于FX一02的活性，有总酸和强B酸酸量不足的原因，更主要是异丙苯在MCM．22孔道扩散时有较大的能垒效应。苯与乙烯的工艺实验和加速失活片命实验表明，改性后MCM．22分子筛的选择性和稳定性均优]jFX一02，具有极大的工业应用前景。关键词：MCM-22动态合成表征改性烷基化应用t／L／+。?L。，7北京服装学院硕士学忙i芑文SynthesisunderRotatingConditions，Characterization，ModificationandAlkylationApplicationofZe

3、oliteMCM一22ZhangXin(Chemical&Engineering、DirectedbyProfessorFuJiquanABSTRACTSynthesisofzeoliteMCM-22underrotatingconditionshasbeenstudied．CharacterizationresultsobtainedfromthedeterminationofXRD，SEM，IR．TG—DTAandporestructuretestshowthattheproductspossesssimi

4、larstructurepropertiesasreportedinotherpaper．Furthermoretheinfluencesofthemodificationwithphosphoricacid．boricacidandcationexchangeonacidity，crystalstructure，activityofcatalysthavealsobeenstudied．FinallY，theappropriatetechnologicalconditionsandtheaccelerated

5、—agingtestofbenzenewithethyleneoverzeoliteMCM一22havebeeninvestigated．TheresultsrevealthatzeoliteMCM·22Ⅵ。ithahighpercentagecrystallinitycanbeobtainedunderrotatingconditionsat448K(or423K)after3days(or7days)usingthetechnicalgradehexamethyleneimineandsilicagel(o

6、rprecipitatedsilica)asatemplateandsilicasourcerespectively．WhenzeoliteMCM-22hasmodifiedbyphosphoricacid，boricacidandcation，thecrystalstructureremainedunchanged，whereasthesuperficialacidicpropertieschanged．Ithasfoundthatthesuperficialacidandthestructureproper

7、tiesofcatalystexhibitstronginfluenceonthecatalyticactivityUnderthereaction，北京服装学院硕士学悔论艾conditionsoftemperature348K．pressure，0．1MPa，theactivityofzeoliteH·MCM一22andmodifiedcatalystsismuchlowerthanthatofthecatalystFX一02．Theresultcanbeexplainedthatthediffusionof

8、eumeneintheporesofMCM·22ishamperedbyahighenergybarrier．TheexperimentsoftechnologicalconditionsonalkylationofbenzenewithethyleneovermodifiedzeoliteMCM．22haveshowthattheconversionofethyleneismoret