The catalyst of environmental catalysis 英语论文

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1、ThecatalystofenvironmentalcatalysisMolecularchemisorptionatmanganeseoxide/liquidinterfaceshasattractedincreasedinterestduetoitsimportanceinthedevelopmentofheterogeneouscatalysts,microbialfuelcellsandselectiveadsorption.Recently,inexpensivemanganeseoxidebasedcatalystsinsteadofnoblemeta

2、lcatalystshavebeeninvestigatedinthecatalyticwetoxidation(CWO)ofphenolicwastewater.However,theadsorptionoforganiccompoundsonmanganeseoxidesurfaces,whichplaysanimportantroleinelectrontransferandoxygenreduction,hasnotfullybeenexplored.Phenolhasattractedmoreattentioninwastewatertreatmentb

3、ecauseofitstoxicityandwideoccurrenceinwastewater.Severalconversionprocesses,currentlyunderdevelopmentfortheproductionofsyntheticfuelfromcoal,dischargesubstantialamountsofphenol(0.2-0.5g/L).Moreover,phenolistakenasamodelcompoundforthestudyofadsorptionandoxidationbecausephenolisaninterm

4、ediateproductintheoxidationofhigher-molecular-weightaromaticcompoundsandphenolalsoconvertstoaseriesofintermediatesonoxidation.Cryptomelane-typemanganeseoxideisanoctahedralmolecularsieve(OMS)composedof2x2edge-sharedMn06octahedralchains,whicharecornersharedtoformonedimensionaltunnels.Po

5、tassiumionsandwaterarelocatedinthetunnels(designatedK-OMS-2).Mixed-valentmanganeseions(Mn2+andMn3+)aresituatedintheoctahedralsitesofcryptomelane.Transitionmetalionscanbeincorporatedintotheframeworkortunnelsites.SizesandchargesofMdeterminewhichsitesareoccupied.Thesyntheticcounterpartof

6、metaliondopedcryptomelaneisknownasoctahedralmolecularsieveM-K-OMS-2(Mdopedmetalions).Inrecentyears,someworkhasbeenpublishedonthesynthesesofcryptomelane-typemanganeseoxidesandtheirapplicationsintheoxidationofbenzene,carbonmonoxide,andotherhydrocarbons.K-OMS-2wasfoundtopossessexcellenth

7、ydrophobicityandstrongaffinityforvolatileorganiccompoundsintheoxidationofbenzene.Littlehasbeenreportedondopingeffectsontheadsorptionofsubstratesoroncatalyticproperties.Thisresearchfocusesonstructure-propertyrelationshipsfordopedcryptomelane.Thesedopedporouscryptomelanematerialshavehig

8、hsurf