简介：ThebacteriausedintheexperimentareThiobacillusFerrooxidansseparatedfromacidicminewaterinsulphidedeposits.Thechemoautotrophicbacteriacanactdirectlyonsulphidesandacceleratetheoxidationofsulphides.Theexperimentshowsthatthebacteria,asanimportantmicrobialfactorofgold’ssupergenousenrichmentwithintheoxidizedzonesofsulphidedeposits,arehelpfultodissolvegoldandsilverinferricsulphate.Inthebacterialoxidationprocess,theprecipitationofgoethiteisconcernedbothwiththeloweractivityofferricionsandwiththeexistenceofcarbonatesinsolution.Meanwhile,theacid-resistingandoxidizingabilityofthebacteriawillcertainlyleaduptoamicrobialwayoftreatingtheacidicminewater.

简介：Carbon-containingrefiactoriesareeasilyoxidizedathightenperature,thusmakingserviceliferapidlydrop.Theanti-oxidationmethods,suchasimpregnationandaddinganti-oxidatonagents,can'tmeettherequire-mentsofindustry'sdevelopmentandsomespecialcases,Byanalyzingthecharcteristicsofseveraloxidesandnon-oxidesrawmaerials,theoxidationresistantmechanismoftherefractoryanti-oxidationcoatings(RAOC),whichpossessthecharacteristcofself-healingathighttemperature,isdiscussed.

简介：Oxidationprocessoflanthanumhexaboride(LaB6)ceramicpowderwasinvestigated.TheLaB6powdersampleswereheatedcontinuallyfromroomtemperatureto1473Kataheatingrateof10K/minbydifferentialscanningcalorimetry.Theoxidationtestswereconductedatdifferentexposuretemperatures.ThephasesandmorphologiesofthesamplesbeforeandafterexposurewereanalyzedbyXRDandSEM.Itwaspointedoutthatbefore1273K,LaB6hashighoxidationresistantability,whichwasduetothattheoxidelayerhinderstheoxygendiffusionfromoutertothesurfaceofLaB6grains.Theoxidelayerwascomposedofthetransitionphases,whichwerecomposedofLa2O3andB2O3formedfromtheinitialoxidation;whentheoxidationtemperatureexceeded1273K,protectivelayerwasdestroyedduetothevaporizationofliquidB2O3.BasedontheresultsofX-raydiffractionanalysis,oxidationprocessofLaB6ceramicpowdercanbedescribedasfollows:Before1273K,lanthanumborate，La(BO2)3wasformedonthesurfaceofsamples,thenlanthanumoxide(La2O3)andboronoxide(B2O3)werepresentonthesurfaceofsamplesoxidizedwhenthetemperaturereachedto1473K.

简介：Theoxidationbehaviorofthreebiodieselsofdifferentorigins,viz.rapeseedoilderivedbiodiesel,soybeanoilderivedbiodieselandwasteoilbasedbiodiesel,weretestedonanoxidationtester.Thechemicalcompositionsofthebiodieselswerecharacterizedbygaschromatography.Thereafter,thestructuraltransformationoffattyacidmethylester(FAME)ofthebiodieselswasanalyzedbyaninfraredspectrometerandanultravioletabsorptionspectrometer.TheresultsdemonstratedthattheoxidationbehaviorofbiodieselsofdifferentoriginswascloselyrelatedtothecompositionanddistributionofFAMEs.HigherconcentrationofunsaturatedFAMEwithmulti-doublebondsexhibitedpooreroxidationresistance.Furthermore,cis-transisomerizationtransformationoccurredintheunsaturatedFAMEmoleculesandconjugateddouble-bondproducedduringtheoxidationprocessofbiodiesel.Greatercis-transvariationscorrespondedtodeeperoxidationdegree.ThehigherthecontentofunsaturatedFAMEwithmulti-doublebondsinabiodiesel,themoretheconjugateddoublebondswasformed.

简介：Inordertofurtherreducethesulfurcontentingasoline,anewdesulfurizationprocesswasproposedbyusingcatalyticoxidationandextractionrealizedinanelectrochemicalfluidizedreactor.Thefluidizedlayerofloadedcatalystparticlesconsistedofleaddioxide(PbO2)supportedonactivatedcarbonparticles(PbO2/C)andtheelectrolytewasaqueousNaOHsolution.ThePbO2/Cparticleanodescouldremarkablyacceleratetheelectrochemicalreactionrateandpromotetheelectrochemicalcatalysisofsulfurcompounds.Thesulfurcompoundswereatfirstoxidizedtosulfonesorsulfoxides,whichwerethenremovedafterextraction.Theexperimentalresultsindicatedthattheoptimaldesulfurizationconditionswereasfollows:Thecellvoltagewas3.2V,theconcentrationofhydroxylionsinelectrolytewas0.12mol/L,andthefeedratewas300mL/min.Undertheseconditionstheconcentrationofsulfuringasolinewasreducedfrom310ppmto70ppm.Basedontheseexperimentalresults,amechanismofindirectelectrochemicallycatalyticoxidationwasproposed.

简介：Anincubationexperimentwascarriedoutinlaboratorytostudytheeffectoftemperature,moisture,phosphorus,organicmatter,croppingandpreviouselementalsulfurapplicationonelementalsulfuroxidationinfourselectedsoils,fluvo-aquicsoil,blacksoil,yellow-brownsoilandredsoil,Inallthesoilstested,sulfuroxidationratewasinfluencedbytemperatureandthetemperaturecoefficient(Q10)valuesattherangefrom10to30℃were4.41,,6.19and3.71forthefoursoils,respectively.Therateofsulfuroxidationwasparabolicallyrelatedtosoilwatercontent.Theoptimummoisturecontentforthemaximumoxiationratewasdifferentamongsoils,Phosphorusincreasedtheoxidationrateofelementalsulfurby57.7%,33.1%,21.7%and26.4%fortheabovefoursoils,respectively,comparedwiththecontrol(nophosphorusapplied).Organicmaterialofcornstrawwhichwasgoundandpassedthrougha0.5-mmsievealsoincreasedthoxidationrateofelementalsulfurinthefoursoilsby59.8%,7.8%,39.2%and540.4%,respectively.Elementalsulfurwhichwasappliedpreviouslytosoilssignificantlyenhancedtheoxidationofelementalsulfursubsequentlyaddedandincreasedsulfur-oxidizingpopulationssuchasautotrophicelementalsulfuroxidizerswithpHoptimum6.8,autotrophicthiosufateoxidizerswithpHoptimum6.8,heterotrophicthiosulfateoxidizersandheterotrophicsulfateproducers.Croppinghadlittleeffectonelementalsulfur-oxidizingpotentialityofsoils.

简介：Thispaperstudiestheretardationprocessforphotosensitizedoxidationof9,10-diphenylanthracene（9,10-DPA）inducedbyhypocrellinA（HA）asasensitizerinthepresenceofpraseodymiumion(Pr3+).ExperimentalresultshowsthatthepromptfluorescenceofHAcanbequenchedbyPr3+inmethanol.Measurementoffluorescencelifetimerevealsthatitremainsconstantwithincreasingcon-centrationofPr3+,thusastaticquenchingcharacterisindicated.ThethermallyinduceddelayedfluorescenceofHAcanalsobequenchedeffectivelybythePr3+-HAcomplex.Thedelayedfluorescencelifetimeisre-ducedfrom1744±50nsto700±50nsand500±50nsinthepresenceofoxygenandPr3+respectively,thusthequenchingofdelayedfluorescenceisofdynamiccharacter.Ascomparedwiththedoublereciprocalrela-tionshipofconcentrationbetweentheoxidationproductderivedfromsingletoxygenandthereactant,itshowsthatthePr3+-HAcomplexcanquenchnotonlytheexcitedtripletofHAbutalsothesingletoxygenandthereforethephotosensitizedoxidationof9,10-DPAisretardedefficiently.

简介：Methaneoxidationbypaddysoilsinaclosedsystemcouldbesimulatedbytheequationx=k1xo/(k1+k2x0)exp(k2t)-k2x0wherex0andxaretheCH4concentrationsattimezeroandt,respectively;k1andk2areconstantsrelatedtotheconstantoffirst-order-kinetics.AccordingtotheequationthechangeofsoilabilitytooxidizeCH4couldbeestimatedbytheequationAc=k2/k1(x0-x)x0k2/k1-1.TheresultsshowedthatthesoilabilitytooxidizeCH4varied,dependingontheinitialCH4concentration.HighinitialCH4concentrationstimulatedsoilabilitytoconsumeCH4,whilelowconcentrationdepressedtheablility.Thischaracteristicofpaddysoilseemedtobeofconsiderablesignificancetoself-adjustingCH4emissionfromfloodedricefieldsifthereexistoxicmicrositesinthesoil.

简介：Vanadiumalloyisoneofthemostimportantcandidatestructuralmaterialsforafusionreactor.Itsmainadvantagesoverothercandidatesareitslowactivityfeatureandfeasiblepropertiesathightemperature.However,vanadiumiseasilyoxidizedathightemperaturetoformanon-protectivesurfacefilmofV2O5.Oxygenconcentrationwouldthusgethighandthepropertiesgetworseinnotonlythelossoftheductilitybutalsotheenhancedhydrogenembrittlementbytheoxidation.

简介：Thecatalyticwetairoxidation（CWAO）ofHacidandphenolwasinvestigatedinthepresenceofCuorFedopedCeO2solidsolutions,whichwereobtainedbysol-gelmethod.TheexperimentresultsshowedthattheincorporationofCuorFeintothefluoritelatticeofCeO2stronglyenhancedtheoxidationactivityofthecatalyst.At90℃and0.1MPa,Hacidconversionwas70%fortheCe0.9Fe0.1O2-δand60%fortheCe0.9Cu0.1O2-δcatalyst.Forphenolremoval,theconversionwas70%fortheCe0.9Cu0.1O2-δcatalyst,whilefortheCe0.9Fe0.1O2-δtheconversionwas30%.TheresultsindicatedthatCe0.9Cu0.1O2-δwassuitableforthetreatmentoforganicwastewaterswhileCe0.9Fe0.1O2-δwassuitablefortheremovalofHacid.The70%phenolremovalratewithCe0.9Cu0.1O2-δcatalystwasmarkedlyincreasedto90%withCe0.8Cu0.2O2-δcatalyst.However,thephenolremovalreducedfrom30%to15%withFecontentincreasingfrom10%to20%.FortheHacid,theincreaseofthecontentofCuorFetendedtoobviouslyincreasetheoriginalreactionratewhiletheCODremovalchangedlittle.

简介：NexttoCO2,methane(CH4)isthesecondimportantcontributortoglobalwarmingintheatmosphereandglobalatmosphericCH4budgetdependsonbothCH4sourcesandsinks.UnsaturatedsoilisknownasauniquesinkforatmosphericCH4interrestrialecosystem.ManycomparisonstudiesprovedthatforestsoilhadthebiggestcapacityofoxidizingatmosphericCH4invariousunsaturatedsoils.However,uptonow,thereisnotanoverallreviewintheaspectofatmosphericCH4oxidation(consumption)inforestsoil.ThispaperanalyzedadvancesofstudiesonthemechanismofatmosphericCH4oxidation,andrelatednaturalfactors(Soilphysicalandchemicalcharacters,temperatureandmoisture,ambientmaingreenhousegasesconcentrations,treespecies,andforestfire)andanthropogenicfactors(forestclear-cuttingandthinning,fertilization,exogenousaluminumsaltsandatmosphericdeposition,addingbiocides,andswitchofforestlanduse)inforestsoils.ItwasbelievedthatCH4consumptionratebyforestsoilwaslimitedbydiffusionandsensitivetochangesinwaterstatusandtemperatureofsoil.CH4oxidationwasalsoparticularlysensitivetosoilC/N,AmbientCO2,CH4andN2Oconcentrations,treespeciesandforestfire.Inmostcases,anthropogenicdisturbanceswilldecreaseatmosphericCH4oxidation,thusresultingintheelevatingofatmosphericCH4.Finally,theauthorpointedoutthatourknowledgeofatmosphericCH4oxidation(consumption)inforestsoilwasinsufficient.InordertoevaluatethecontributionofforestsoilstoatmosphericCH4oxidationandtheroleofforestplayedintheprocessofglobalenvironmentalchange,andtoforecastthetrendsofglobalwarmingexactly,moreresearchersneedtostudiesfurtheronCH4oxidationinvariousforestsoilsofdifferentareas.

简介：Sprayingtestwereconductedtwicebeforesteelslabswereputintothefurnaceandtheeffectsoftheoxidationresistancecoatingwereinvestigatedandverified.Bycomparingthechangeofslabweight,rollingforceoftheroughingmill&finishingmill,thicknessofoxidefilmonthesurfaceslabsbyanXL-30SEMandacidpicklingspeedofslabswithandwithoutcoating,itwasfoundthattheoxidizationwasteinthefurnacedecreasedby40percentwiththeuseofthecoatingandthecorrespondingyieldcapacitycouldincreaseby0.2percentatleast.Besides,thethicknessofoxidescalefilmonhotrolledproductswasreducedby1.44micrometersandtheacidpicklingtimewasshortenedby6swiththecoatingtechnology,whilethetotalrollingforceofRM&FMdidnotchanged.Furthermore,theapplicationprospectofthistechnologywasalsodiscussedinthispaper.

简介： <正> TheDalianInstituteofChemicalPhysicsofCAShasmadegreatstridesinselectiveoxidationstudiesafterhavingperformedsuccessfulcommercialtestingofthenovelcatalystforoxidationofparaxyleneinthe100kt/ascale.

简介：血浆nitrocarburizing和血浆氧化处理被执行改进wear和SKD61钢的腐蚀抵抗。血浆nitrocarburizing在生产epsilon-Fe2_3的氮，氢和甲烷空气在540°C为12h被进行(N，C)血浆nitrocarburising生产的phase.The混合物层主要由电子阶段组成，与gamma'-Fe4的一个小比例(N，C)复合的层和扩散层的phase.The厚度是大约10亩m和大约200/^m，respectively.Plasma柱子氧化为1h.The在500°C的经常的温度与各种各样的氧/氢比率在nitrocarburized样品上被执行在在复合的层上的厚度的1-2亩m的很薄的磁铁矿(Fe3O4)层被获得。阳极极化测试表明那个血浆nitrocarburizing过程贡献了SKD61钢的腐蚀抵抗的重要改进。然而，nitrocarburized混合物层的腐蚀特征被氧化处理败坏。

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简介：IntheprocessofinvestigationondomesticPTAprojecttheResearchInstituteofSINOPECYangziPetrochemicalCompanyundertakestoperform“AnalysisandprocessoptimizationofAmocohigh-temperatureoxidationtechnology”,“DevelopmentandcommercializationstudyonnovelcatalystforsynthesisofPTA”,“StudyonPTAoxidationreaction”,and

简介：Nanofibrous碳的材料(NFC)作为有许多应用的材料的一个新班，能催化H2S的选择氧化到硫。在在H2S氧化的NFC结构和它的活动和选择之间的关联是坚定的。如果有更多的订的结构的NFC被综合，在碳的原来的催化剂的部分被增加在催化剂积累的碳减少，选择能被改进，这被表明。

简介：离子的液体的一种新类型支持了硒试剂被综合并且发现了面对30%H2O2是在到醛和酉同类的白酒的氧化的优秀催化剂。离子的液体的可预言的溶解度从反应混合允许氧化产品的容易的分离。而且，当溶剂，和离子的支持液体的硒试剂能被再循环并且在催化性能与小减少在四次使用了，氧化反应能用离子的液体被执行。

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