H2O2為氧源CaO催化苯乙烯環(huán)氧化反應(yīng)的研究.pdf

1、遼寧師范大學(xué)碩士學(xué)位論文H2O2為氧源CaO催化苯乙烯環(huán)氧化反應(yīng)的研究姓名：谷慶明申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：物理化學(xué)指導(dǎo)教師：孫琪201205H202為氧源CaO催化苯乙烯環(huán)氧化反應(yīng)的研究EpoxidationofStyrenewithHydrogenPeroxideoverCaOCatalystsAbstractEpoxyethylbenzeneisallimportantindustrialchemicalsthathavebeenu

2、sedaschemicalintermediatesCatalyticepoxidationofstyreneaffordsallinterestingtechnologyfortheirproductionWithregardstothis，thereactionofepoxidationofstyrenetoepoxyethylbenzenehasbecomeamorepopularresearchtopicinthecatalyt

3、icThepaperreportstheeffectofCaOontheepoxidationofstyreneInthispaper，AseriesofCaOsampleshavebeenpreparedbycalcinationofcommerciallyavailableandsynthesisofcalciumsaltprecursorssuchascalciumacetate，carbonate，hydroxide，oxala

4、teandthesehavebeenfoundtobeeffectivefortheepoxidationofstyreneusinghydrogenperoxideasalloxidantinthepresenceofacetonitrileTodeterminetheinfluenceofthephysicochemicalpropertiesandsurfacebasicityonthecatalyticactivitythepr

5、eparedCaOsampleshavebeencharacterizedusingthermogravimetry(TG)，Xraydiffraction(XRD)，scanningelectronmicroscopy(SEM)，N2adsorptionandtemperatureprogrammeddesorption(TPD)ofC02Theresultsindicatethattheamountsofverystrongbasi

6、csitesandhigherbasicitystrengthontheCaOsamplearethekeyfactorsfortheexcellentperformanceofthecatalystsIncontrastthesurfacearea，porosityandthesurfacestructureofCaOsampleshavearelativelyminoreffectoncatalyticactivityTheCaOs

7、ampleobtainedbydecompositionofCa(OH)2preparedbyprecipitatingcalciumnitratewithsodiumhydroxideinethyleneglycolsolution，whichshowsthehighestamountofverystrongbasicsitesandthestrengthofbasicsites，catalyzestheepoxidationofst

8、yrenewithhigherratesUsingappropriateconditionsconversioninexcessof99％with975％selectivitytoepoxyethylbenzenecouldbeobtainedPreparationconditionsofcatalysthaddifferenteffectsontheepoxidationofstyreneTheresultsindicatethatt

9、heoptimizedreactionconditionwerecalcinationtemperature800℃acetonitrileassolvent，styrene／acetonitrile=1：20molarratio，catalyst／styrene=14％qualityratio，styrene／H20z=1：6molarratio，60oC，and10hAndtherecoveredcatalystsafterhigh

10、temperatureactivationstillshowedgoodcatalyticactivityunderthesalTleconditionsWiththeincreaseofffequencyofuse，thecatalystactivitygraduallydecreasedOthersolidbases，suchasLa203、KN03／7一A1203、K2C03／7一A1203havelowcatalyticcati