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1、Cr基催化劑上VOCs催化氧化性能研究甲苯的催化性能和表征結(jié)果,發(fā)現(xiàn)CrOx.Zr02對CH2C12和乙酸乙酯的氧化性能高于對甲苯的氧化性能,而Pd/Zr02對甲苯表現(xiàn)出較好的氧化性能;雙組份Pd/CrO。一Zr02催化劑對三種反應(yīng)物都表現(xiàn)出較高的催化性能。BET測試和NH3.TPD表征結(jié)果顯示,Pd和Cr的添加增大了催化劑的比表面積,提高了催化劑的表面酸性。這可能是Pd/CrOx.Zr02表現(xiàn)較高催化效果的原因。此外,Pd/CrO。一Zr02具有較好的反應(yīng)穩(wěn)定性。關(guān)鍵詞:鉻基催化劑;甲烷氧化;二氯甲烷;乙酸乙酯;甲苯;催化燃燒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誦thM曲Crcontent,butfurtherincreasingCrcontentresultedinasuppressedactivity.Thiswasduetotheincreasingamountofactivesites、航thincreasingCrcontent。buthigherCrcontent
8、ledtolargercrystalliteofCr203.2.CrOx/A1203sampleswerecharacterizedusingXRDandRamantechniques.Itwasfound