钙钛矿催化剂上CH4和CVOCs催化氧化性能分析

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1、万方数据CATALYTICCOMBUSTIONOFCH4ANDCVOCSOVERPEROVSKJTECATALYSTSABSTRACTChlorinatedvolatileorganiccompounds(CVOCs)arehazardoustotheenvironmentandpublichealth．C／-hasallimportantcomponentofnaturalgas，andisthemostdifficultoxidationoforganicmatter,ifahighlyactivecatalystisprepared，w

2、illalsohavegoodcatalyticeffectonotherorganicwastegas．CatalyticcombustionisrecognizedasoneofthemostpromisingtechnologiesintheabatementofCVOCsandCH4．Themostcommonlyemployedcatalystsincludenoblemetalcatalystsandtransitionmetaloxides。AlthoughnoblemetalsareeffectiveforCVOCscombu

3、stion，thehighcostslimittheirpracticalapplications．Therefore，moreattentionhasbeenpaidtotranisitionmetaloxides，whicharestableandactiveinthereactionprocess．Amongthetransitionmetaloxides，Perovskite—typeoxides(AB03)havemanyadvantagessuchaslowcostandhightemperaturestability,which

4、makethemwidelyappliedincatalyticcombustion．ThemainroleofA·-sitecationisto'keepthecatalyststability,whiletheB．．sitecationusuallydeterminestheactivityofthecatalyst．Inthisthesis，variousPerovskite-typeoxideswerepreparedandtestedforcatalyticcombustionofCI-handCVOCs．Theinfluences

5、ofpreparationparametersandcation-substitutiononthecatalyststructureandtheircatalyticperformancewereinvestigated．Themaincontentsoftheworkareasfollows：1．AseriesofLaM03(M=Mn，Fe，cOcatalystswerepreparedbyasol—gelmethod，andtestedforCI-handCH2C12catalyticcombustion．Theresultsrevea

6、ledthatLaMn03catalystwereeffectiveforbothCI-14andCH2C12combustion．TheeffectofcalcinationonthecatalyticperformanceWasalsostudiedanditWasfoundthathightemperaturecalcination(700oC)Wasbeneficialtotheactivity．Inaddition，A1．substitutionWasfoundtObehelpfulintheenhancementoftheacti

7、vity．VariouscharacterizationresultsshowedthatthecatalyticperformanceWasmainlydeterminedbysurfaceareaandreducibilityofthecatalyst．2．AseriesofA1·substitutedA1xLal．xMn03(x=0-0．3)catalystswerepreparedusingasol—gelmethodandtestedfor1，2-dichloroethaneoxidationinordertoinvestigate

8、theIII万方数据ABSTRACTeffectsofA1·dopingandthermaltreatmentonthecatalyststructuresandc