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《Cr基催化劑上VOCs催化氧化性能分析》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
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
