简介：Aseriesofthecoconutactivatedcarbons(CAC)basedabsorbentsmodifiedwithCuandCe(Cu/CAC,Cu/Ce/CAC)werepreparedbyimpregnationtechnologyforcarbondioxidecapture.TheadsocrptionequilibriumsofCO2onCu/CACandCu/Ce/CACweremeasured.TheresultsshowedthattheadsorptioncapacityofCO2ontotheactivatedcarbonmodifiedwithCu/Ceincreasedwiththedecreasingtemperatureinthesamepressure.TheadsorptioncapacityofCO2onCu/CACwashigherthanthatoftheblankCAC,andcomparedwiththeCu/CAC,theadsorptioncapacityofCO2ofCu/Ce/CACwiththemassratioofCu/Ce=30wasimprovedat298and303K.Inaddition,theadsorptionequilibriumdataforCO2atvarioustemperatureswasfittedtoLangmuir,FreundlichandD-Risothermmodels.ItwasfoundthattheD-RequationwasthebestmodelforfittingtheadsorptiondataonCu/Ce/CACatdifferenttemperatures.

简介：

简介：纳米大小的钇铝石榴石(钇铝柘榴石)粉末被与铵氢碳酸盐把一起沉淀方法用作综合一急躁。当碘在分别地，在答案的Y3+和Al3+的起始的集中在0.018和0.03mol/L被设置的条件和pH=8上在一起沉淀过程被介绍时，结果显示一位极其松开的钇铝柘榴石先锋被获得。因而，在在为2h的1173K的锻烧与30nm和更好的sinterability的一种平均谷物尺寸由monodispersed粒子组成以后，产生钇铝柘榴石搽粉。现在的结果显示修改一起沉淀方法，与是的碘添加剂，比常规一起沉淀方法优异，综合极其细小的钇铝柘榴石粉末。

简介：

简介：Y-ModifiedUSYwaspreparedbyionexchangeofUSYslurrywith0.01mol·L-1Y(NO3)3.Phosphotungsticacid(HPW)catalystsupportedonUSYandY-USYwaspreparedbyanimpregnationmethod.ThematerialswerecharacterizedbyNH3-TPD,XRD,andN2adsorption.Theactivityfortheremovalofthiophenewasexaminedinathree-neckedflask.ThesulfurcontentofmodelcompoundwastestedonWK-2Dmicrocoulometricdetector.TheeffectofyttriumandHPWcontent,reactiontemperatureandcatalysts,activationtemperatureontheactivityofcatalystswereinvestigated.ItwasshownthattheoxidationactivityofthiophenedecreasedwiththeincreaseofYcontentexceptforthecatalystofY5%.HPWcontenthadlimitinfluenceonactivityofcatalysts.Theoptimalreactiontemperatureandactivationtemperaturewere40and320℃,respectively.

简介：

简介：小镁合金最近吸引了可观的兴趣在汽车并且经由车辆的重量减小改进燃料效率和还原剂CO2排出物的航空航天工业。稀土元素(RE)元素增加能显著地通过削弱与强壮的机械anisotropy和紧张压缩收益不对称现象联系的结晶的质地改进镁合金的机械性质。当RE元素的增加在机械anisotropy阐明改变时，组成的关系的可得到的信息过去常描述重新包含的流动行为镁合金被限制。建立如此的一种组成的关系，单轴的压缩变丑测试首先以从1映牯搠楲的紧张率在渗出的Mg-10Gd-3Y-0.5Zr(GW103K)镁合金上被进行？

简介：Differentrareearth(RE=La,Ce,Pr,Nd,Sm,Y)andCumodifiednickelcatalystsforhydrogenproductionfrommethanedecompositionweresynthesizedbyasol-gelprocessandmethod.ThecatalystswerecharacterizedoranalyzedthroughBrumauer-Emmett-Teller(BET),X-raydiffraction(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM)techniques.Andthehydrogenproductionperformancewasalsoevaluatedbyafixed-bedandmicro-reactiontechniquewithCH4→C+H2asaprobereaction.Theresultsshowedthatrareearthmodificationhadplayedagreatrolefornickelcatalysts,forexample,smallernickelparticles,goodthermalstability,highactivity,etc.Lawasthebestadditiveamongrareearthmodification.TheSEMofrareearthmodifiedcatalystsshowedorderedflower-likestructureandrareearthmodificationmadethenickelparticlesmovetothesurfaceofcatalysts.Inaddition,theSEMofnano-carbonswasalsochangedbyrareearthmodificationwithlong,narrownano-carbonfibersortubesobtained.Solidcarbonformationwaspreventedbyrareearthmodification.

简介：AseriesofMn-basedcatalysts,MnOx,MnOx-CeO2,Pd-Mn-Ce,MnOx/ACwereprepared.AndtheirperformancesforNOlow-temperatureSCRwereinvestigatedinthisstudy.TheNOconversionisabout90%at100℃onMnOx-CeO2andalmostallNOcanbeconvertedat120℃.SimilarresultsarealsoobservedinthetestsonMnOx-CeO2/AC.Theexcellentlow-temperaturecatalyticactivityofmodifiedMn-basedcatalysts,whichmaybemainlyduetotheoxygenstoragefunctionofCeO2,canimprovetheoxygenflowonthecatalystssurface.ThentheoxidationofNOtoNO2isaccelerated,whichisthekeystepofNOSCR.

简介：Theresincompositematerials(RCM)werepreparedbythemethodofdopingresinwithtourmalinepowdersmodifiedwithlanthanumelement.Itwascharacterizedbyscanningelectronmicroscope(SEM),IRradiationdetermination,X-raydiffraction(XRD),andfouriertransforminfraredspectroscope(FTIR).TheresultsshowedthattheRCMcouldradiatehigherintensityoffarinfrared.Themolecularmovementwasstrengthenedandtheinter-molecularcontactswereeasilyreducedwhenthedieseloilwasdealtwiththeRCM.TheeffectsoftheRCMontheoilconsumptionandairpollutantemissionsofoil-burningboilerwereinvestigated.Theoil-savingrateoftheRBS·VH-1.5boilerdealtwiththeRCMwas2.76%,andthereducingratesofCOandNOintheexhaustgaswere32.9%and15.8%,respectively.

简介：Aseriesofcoal-basedactivecarbon(AC)catalystsloadedbyFe-Cu,Fe-Cu-CeandFe-Cu-Lawerepreparedbythesol-gelmethodforcarbondisulfide(CS2)hydrolysisandtheirperformancesforCS2hydrolysisinafixed-bedreactorwereinvestigatedinthiswork.TheresultsshowedthatthekindofrareearthoxideanditscontenthadobviouseffectonhydrolysisremovalofCS2.Theeffectsoftemperature,spacevelocity,CS2concentrationandO2concentrationwerealsodiscussedrespectively.Furthermore,thesuitableoperatingconditionswereobtained.Itwasfoundthatthepoisoningofhydrolysisactivesitescouldresultintheformationofsulfuricacidonthecatalystsurface.

简介：

简介：Sm0.2Ce0.8O1.9(SDC)electrolytewaspreparedbyamodifiedsolidstatemethodatrelativelylowsinteringtemperatureswithoutanysinteringpromoters.ThephasecompositionandmicrostructureoftheelectrolyteswereinvestigatedbyX-raydiffraction(XRD)andfieldemissionscanningelectronmicroscopy(FESEM)technologies.ArelativedensityofSDCelectrolytesinteredat1300oCreached97.3%andthemeanSDCgrainsizewasabout770nm.Theirionicconductivityandthermalexpansioncoefficientwerealsomeasuredbyelectrochemicalworkstationanddilatometer.Theelectrolyteattainedahighconductivityof5×10–2S/cmat800oCwithanactivationenergyof1.03eVandaproperthermalexpansioncoefficientof12.6×10–6K–1.

简介：InordertoimprovethecorrosionandmechanicalpropertiesofAM50magnesiumalloy,1wt.%GdwasusedtomodifytheAM50magnesiumalloy.Themicrostructure,corrosionandmechanicalpropertieswereevaluatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),energydispersivespectroscopy(EDS),electrochemicalandmechanicalstretchmethods.Theresultsindicatedthatβ-Mg17Al12phasedecreasedandAl2Gd3andAl0.4GdMn1.6phaseexistedafterGdaddition.BecauseoftheGdaddition,thegrainofAM50magnesiumalloywasrefinedsignificantly,whichimprovedthetensilestrengthofAM50magnesiumalloy.Thedecreasingofβphaseimprovedthecorrosionresistanceofthemagnesiumalloy.ThefracturemechanismoftheGdmodifiedAM50magnesiumalloywasquasi-cleavagefracture.Thecorrosionresidualstrength(CRS)ofAM50magnesiumalloywasimprovedafter1wt.%Gdaddition.

简介：MonophasicCe~(3+)andPr~(3+)co-dopedyttriumaluminumgarnet(YAG:Ce~(3+),Pr~(3+))nanoparticleswithgooddispersityanduniformgrainsizesintherangeof50–80nmwerepreparedbyatwo-steproute,whichconsistedofamodifiedco-precipitationpreparationofmixedmetalhydroxidehydrateintermediatesatlowtemperatureofabout40oCandasubsequentcalcinationconversionofthesynthesizedintermediatestocrystallinenanoparticleproductsatabout1000oC.Theinfluencesofboththelanthanideion(Ce~(3+)andPr~(3+))dopingconcentrationanddifferentdoping(Ce~(3+)/Pr~(3+))ratioonthephotoluminescenceintensityweresystematicallyinvestigated.Thesynthesized(Ce_(0.6)Pr_(0.4))_(0.04)Y_(2.96)Al_5O_(12)nanoparticleswerenearsphericalnanoclusterswithgooddispersityanduniformsizesintherangeof50–80nmforabout85%oftheparticles.Thestrongestphotoluminescenceintensitywasobservedforthe(Ce_(0.6)Pr_(0.4))_(0.04)Y_(2.96)Al_5O_(12)nanoparticleproducts.

简介：Selectivecatalyticoxidation(SCO)ofammoniawascarriedoutoverCu-MncompoundscatalystsmodifiedwithtrivalentrareearthoxideCe2O3andLa2O3respectively.TiO2wasusedassupportanddifferentratioofO2weretestedinordertofindanappropriateO2concentration(vol.%),andtheresultsshowedthat1%O2(vol.%)waspropitioustoSCOofammonia.TheeffectsofthetworareearthoxidesmodifiedcatalystsCe2O3-Cu-Mn/TiO2andLa2O3-Cu-Mn/TiO2onthecatalyticactivityandselectivityofammoniaoxidationwereinvestigatedunderthereactionconditionof500ppmammonia,1%O2(vol.%),atthetemperaturefrom125to250oC.TheresultsrevealedthebeneficialroleofCe2O3andLa2O3incatalyticactivityatlowtemperatureandleanoxygenconcentration,whilethemodificationwithCe2O3andLa2O3ledtothenegativeinfluenceonN2selectivity.ForthecatalystsmodifiedwithCeshowedlowerNOandN2OselectivitythanthecatalystsmodifiedwithLa,thentheeffectsofdifferentCeloadingsoncatalyticactivityandselectivitywerealsoconsidered,incombinationwithcatalystspreparationmethods,whichincludeincipientwetimpregnation,sol-gelmethodandco-precipitation.Resultsrevealedthatthecatalystspreparedbysol-gelmethodobtainedpreferablecatalyticactivitycomparedwiththeothers,reaching99%ammoniaat200oC,whereas96%NOwasdetected.Italsoindicatedthatdifferentcatalystpreparationmethodsignificantlydeterminedproductiondistribution.