Mn基催化剂上VOCs催化氧化性能分析

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1、Mn基催化剂上VoCs催化氧化性能研究4、以OMS．2为前驱体，采用浸渍法制备了系列AI／OMS．2催化剂，并考察了其对CH2C12的催化氧化性能和热稳定性，活性结果表明随着灿负载量的增加催化剂对CH2C12的氧化的活性先增加后降低。H2．TPR结果表明1．0AI／OMS．2催化剂的还原峰向低温方向偏移，表明了该催化剂具有更好的氧化还原性能。当Al的负载量超过1％后活’性进一步降低，其原因还待进一步探究。此外AI／OMS．2催化剂具有较好的反应稳定性。关键词：锰基催化剂；二氯甲烷；催化氧化；OMS．2分子筛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