Cr基催化剂上VOCs催化氧化性能分析

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1、Cr基催化剂上VOCs催化氧化性能研究甲苯的催化性能和表征结果，发现CrOx．Zr02对CH2C12和乙酸乙酯的氧化性能高于对甲苯的氧化性能，而Pd／Zr02对甲苯表现出较好的氧化性能；双组份Pd／CrO。一Zr02催化剂对三种反应物都表现出较高的催化性能。BET测试和NH3．TPD表征结果显示，Pd和Cr的添加增大了催化剂的比表面积，提高了催化剂的表面酸性。这可能是Pd／CrOx．Zr02表现较高催化效果的原因。此外，Pd／CrO。一Zr02具有较好的反应稳定性。关键词：铬基催化剂；甲烷氧化；二氯甲烷；乙酸乙酯；甲苯；催化燃烧0J．『

2、j_‘一●◆STUDYOFCATALYTICCOMBUSTIONOFVOCsOVERCHR0蚤mUM．BASEDCATALYSTSABSTRACTAmongtechnologiesforeliminationofvolatileorganiccompounds(VOCs)emissions，catalyticcombustionhasbeenpaidmuchattentionbecauseofitslowenergyconsumption，lli曲efficiencyandsimpleequipment．Moreover,thereis

3、noassociatedpollutionsuchasnitrogenoxides(NOx)production，asitisoperatedatlowtemperature．Acatalystwithhighactivityisthekeytocatalyticcombustion．Amongthecatalystsforchlorinatedvolatileorganiccompounds(CVOCs)catalyticcombustion,mostreportsfocusonthechromium．basedcatalysts．H

4、owever,theCr-basedcatalystsusuallyneedhi曲operationtemperatureandhaveshortservicelife，SOcatalystswithhi曲activityandthermalstabilityarethereforedesirable．Thechromium—basedcatalystsaremoreactiveforCVOCsabatementthanforhydrocarbon．Sincetheindustrialexhaustgasesusuallycontain

5、variouskindsofVOCs，suchasCVOCs，aromatic，ester,etal，amuki—functionalcatalystwasdevelopedwiththechromium—basedcatalystsupportedPd，whichiseffectiveforCVOCs，oxygenatedandaromaticcompounds．Thedetailedcontentsofthisthesisareasfollows：1．AseriesofCrOx／Zr02catalystswerepreparedby

6、adeposition·precipitationmethod，andtestedforCH4catalyticoxidation．TheXRDresultsindicatedthatthechromiumspecieswereinformof0203，whilethesupportZr02wasmonoclinic，andthecrystallitesizesofCr203andZr02increasedwimincreasingcalcinationtemperature．ThecooperationofCr203andZr02re

7、sultedinanincreaseofthesurfaceareaofCr00盈02catalysts．ItWasalsofoundthatenhancedactivityWasobtainedonthecatalyst诵thM曲Crcontent，butfurtherincreasingCrcontentresultedinasuppressedactivity．Thiswasduetotheincreasingamountofactivesites、航thincreasingCrcontent。buthigherCrcontent

8、ledtolargercrystalliteofCr203．2．CrOx／A1203sampleswerecharacterizedusingXRDandRamantechniques．Itwasfound