含Cr介孔分子篩的研究.pdf

1、復(fù)旦大學(xué)碩士學(xué)位論文含Cr介孔分子篩的研究姓名：樂洪詠申請學(xué)位級別：碩士專業(yè)：物理化學(xué)指導(dǎo)教師：高滋2000.6.1■●■AbstractOwingtotheirintriguingpropertiesextensiveresearchhasbeenfocusedonthesynthesis、characterizationandapplicationsofmesoporousmolecularsievesaswellasontheir

2、modificationssincethefirstfamilyofthem，namelyM41S，wasannouncedtObesynthesizedin1992byagroupofscientistsinMobilCompany，InthisworkwefirstsuccessfullyincorporatedchromiumwithdifferentcontentsintomesoporousmolecularsieveHMS，

3、characterizedtheresultingCrHMScatalystsandstudiedtheircatalyticbehaviorintwoliquidselectiveoxidationreactionswheretheleachingofchromiumwasmeasuredaswellInanotherpartofourworkchromiumwasimpregnatedonanewtypeofmesoporousmo

4、lecularsieveknownasSBA一15toobtainchromiumsupportedcatalysts，designatedasCr／SBA一15，withtheirstructuralpropertiescharacterizedandtheircatalyticactivityinthedehydrogenationofethylbenzeneevaluatedAcomparisonbetweenCr／SBA一15a

5、ndCr／HMSwasmadeThemainconclusionsaredrawnbelow：1CrHMS、Cr／SBA一15andCr／HMSallsufferedadecreaseintheirspecificsurfaceareas，porevolumesandstructuralorderinaccordancewiththeincreaseinchromiumcontentButCr／SBA一15retainedthesepr

6、opertiesbetterthanCr／HMSChromiumwashighlydispersedwhenitscontentwaslowerthan589％forCr—HMSand9％forC“SBA15andCr／HMS2CrHMSexhibitedmoderateactivityinthehydroxylationofbenzenebutexcellentperformanceintheoxidationofcyclohexan

7、eThevariationoftheconversionsofbenzeneandcyclohexaneasafunctionofchromiumcontentbothdisplayedavolcanocurve，whereasaninvertedvolcanocurvewasobservedwhenthedissolutionofchromiuminthereactionswasconcernedDetaileddiscussioni

8、savailableinthecontext3CffSBA一15andCr／HMSbothrevealedhighactivityinthedehydrogenationofethylbenzeneHowever，withonly3％ofchromiumloadedonSBA15，aconversionofethylbenzeneover80％wasobtmned，whichCOuldn’tbeachievedinthecaseofCr