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1、Mn基催化劑上VoCs催化氧化性能研究4、以O(shè)MS.2為前驅(qū)體,采用浸漬法制備了系列AI/OMS.2催化劑,并考察了其對(duì)CH2C12的催化氧化性能和熱穩(wěn)定性,活性結(jié)果表明隨著燦負(fù)載量的增加催化劑對(duì)CH2C12的氧化的活性先增加后降低。H2.TPR結(jié)果表明1.0AI/OMS.2催化劑的還原峰向低溫方向偏移,表明了該催化劑具有更好的氧化還原性能。當(dāng)Al的負(fù)載量超過(guò)1%后活’性進(jìn)一步降低,其原因還待進(jìn)一步探究。此外AI/OMS.2催化劑具有較好的反應(yīng)穩(wěn)定性。關(guān)鍵詞:錳基催化劑;二氯甲烷;催化氧化;OMS.2分子篩Ⅱdl
2、●■f一卜}j§IflI‘_l{^Jt‘;t}t-●lIlt擎i■●、,’,●STUDYOFCATAIⅣTICCOMBUSTIONOFVOCsOVERⅣ川GANESE.BASEDCATAIYSTSABSTRACTCatalyticcombustionisaneffectivetechniquefortheeliminationofvolatileorganiccompounds(VOCs)duetoitslowenergyconsumptionandhighefficiency.Also,catalyticcom
3、bustionhasbeenpaidmuchattentionforitssimpleequipmentrequirement,safeoperationandmoreimportantlywithoutassociatedpollutionsuchasnitrogenoxides(NOx)productionduringtheprocess.HiglllyactivecatalystisthekeytOcatalyticcombustion.FortheeliminationofVOCsincludingchl
4、orinatedvolatileorganiccompounds(CVOCs),noblemetalcatalystsandCr-basedcatalystsareusuallyemployed.NoblemetalcatalystssuchasPdandAuhavebeenprovedtobeveryeffective;however,thehighcostsofthecatalystslimittheirapplications.FortheCr-bascdcatalysts,theyshouldbecare
5、fullytreatedbecauseoftheirtoxicity.butthehavepracticallimitationsforthehighprice.Somechromium-basedcatalystshavetoxicSOwehadbetternottousethemfi'eely.Someothernon-noblemetalcatalystswerealsoreported,buttheyoftenhavelowactivities.Therefore,theaimofthisthesisis
6、todevelopeconomiccatalystswithhighefficiencyThemainscontentsofthethesisareasfollows:1.AseriesofCel.xMnx02catalystswerepreparedusingasol—gelmethodandtestedforcatalyticoxidationofCH2C12.TheresultsindicatedthatthesecatalystswerehighlyactiveintheoxidationofCH2C12
7、,withacompleteoxidationtemperatureof480oC.TheXRDresultssuggestedthatsolidsolutionwasformedduetotheincorporationofMnintheCc02lattice.TheXPSresultsindicatedthattheMnspeciesinthecatalystswereinoxidationstatesof+3and+4.TheH2.TPRshowedthattheadditionofCeinthecatal
8、ystremarkablyloweredthereductiontemperatureofthelatticeoxygeninMnOx.TheintrinsicreactivitycalculatedbasedontheMncontentinthecatalystfollowedtheorderofCCO.8Mn0.202>Cco.6Mn0.402>Cco.5Mno.50