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ID:39111304
大小:2.07 MB
页数:59页
时间:2019-06-25
《USY分子筛上的二异丙苯烷基转移反应》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、ABSTRACTTHETRANSALKYLATIONoFDllSOPROPYLBENZENoNTHEUSYZEoLITEInthisdissertation,thethermodynamicpropertiesofthereactionsystemalestudiedbasedontheknowledgeofthermodynamics.AseriesofUSYzeolitecatalystswererespectivelymodifiedbyNi13,MgandNH3一Mg.TheUSYsamplesbeforeandaftermodificationwerecharacterizedbyX
2、RD,BET,NH3-TPD,andNMR.ThecatalyticperformanceoftheUSYsampleswasinvestigatedontheiso-thermofixedreactor.TheresultsshowedthatNH3modificationcanmaintaintheUSYzeoliteframeworkstructure,atthesametime,effectivelyimprovethedistortionenvironmentofthefour-coordinatedframeworkaluminuminwhichthecrystallinityof
3、thecatalystWasincreased.AndwiththegrowthofNI-13modificationtime,USYzeolitemesoporousvolumewasincreased,poresizedistributionwaswidened.Furthermore,thesamplewithNH3modifiedfor6hsignificantlyincreasedtheacidityofzeoliteandtheconversionofdiisopropylbenzeneincreasedby10%,theselectivityofisopropylbenzenew
4、asincreasedfrom80.12%to86.14%.Byincipientimpregnationmethod,USYzeolitewasmodifiedbyM92+.ThequantityofMgloadedOilthezeoliteisO.15%,O.5%,1%oftheM92+.Thecatalystevaluationresultsshowthattheoptimalmodifiedconcentrationof111北京化工大学硕士学位论文magnesiumionisO.15。/o--O.5%.NH3andM92+modification,thecatalystevaluat
5、ionresultsshowedthattheconversionofdiisopropylbenznewasincreasedto86.89%,andthelifetimeofthecatalystinthestudytime(72hours)showedactivation.Usingsingle—factortest,inawiderangeofoperatingtemperature(140"(2-200"C),benzeneanddiisopropylbenzenemolarratio(5:1~11:1),thechangeoftheconversionandselectivityo
6、fthetransalky’lationreactionwasinvestigated.Theresultsshowthat:asthetemperatureincreased,theconversionofdiisopropylbenzeneandthecontentofn-propylbenzeneincreased,buttheselectivityofisopropylbenzenedecreased.Improvingthemolarratioofbenzene/diisopropylbenzeneisconducivetoenhancetheconversionandselecti
7、vity,butwhenthemolarratioismorethan9,theeffectofmolarratioontheconversionandselectivitysignificantlydecreased.Whenthelawmaterialcontainstriisopropylbenzene,theconversionofdiisopropylbenzenedecreased,a
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