甲苯甲醇烷基化制備對二甲苯催化劑的研究.pdf

1、南開大學碩士學位論文甲苯甲醇烷基化制備對二甲苯催化劑的研究姓名：孫青申請學位級別：碩士專業(yè)：物理化學指導教師：關乃佳20070501AbstractAbstractParaxylene(PX)，thebasicorganicmaterialinpetrifactionindustryhasextensiveapplicationinchemicalfibersyntheticresin，pesticide，plasticmedicine

2、andotherchemicalfieldsIntheprocessofproducingPXbyalkylationoftoluenewitllmethan01ZSM5hasbeenwidelyusedforitsspecialstructureandshapeselectivityHoweverinpreviousreportstwoormoreelementmodificationwithloweoncentrationhasra

3、relybeenstudiedcomparedwithmonoelementmodulationwithhighconcentrationInthispaperZSM5wasfirstmodifiedbytwoorthreeelementswithlowconcentrationandthenitWasstudiedasthecatalystofalkvlafiunoftoluenewithmethan01Basedontheexper

4、imentalresultsthetwoelementmodifiedcatalystB(2wt％)Ca(2wt％)ZSM一5hadthebestparaseleetivitywiththelestBacidsitesItisobviouslythattheredutionofBacidispropitioustoincreasethepara—selectivityB(2wt％)Mg(1wt％)ZSM5hadthebestreacti

5、onactivityandstabilitywiththelestLacidsitesItisobviouslythattheredufionofLacidispropitioustoincreasethereactionacridtyandstabilityAndthethreeelementsmodifiedZSM一5zeolites，B(2wt％)一Mg(1wt％)一Ca(2wt％)zSM一5andB(2w1％)Mg(1wt％)C

6、a(2wt％)ZSM5hadthebestreactionactivitystablityandparaxyleneselectivityAtthes鋤etimedifferentmodifiedorderalsohadeffectioninthecatalyticactivityZeolitewithhetroatomsinframeworkalsousedascatalystinthisreactionThispaperalsost

7、udiedtheinfluenceofreactionparametersontheperformanceofallmodifiedcatalystsItWasfoundthatallthecatalystshadthebestoverallcharacterunderthereactiontemperature500“C，theratiooftolueneandmethanol2：1andWHSV6h—Otherzeolitewere

8、testedtheactivitytothisreactionItwasfoundthattheparaselectivityonHMCM一22WaslowbecauseofitstooIargechannels，buttheyhadthemostfavoritestabilityfortheloweracidstrengthHowevertheconversionoftolueneonaluminophosphatebasedmole