欢迎来到天天文库
浏览记录
ID:39101513
大小:2.08 MB
页数:65页
时间:2019-06-24
《Cr基催化剂上VOCs催化氧化性能分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
此文档下载收益归作者所有