简介:二高度光的铕(III)和铽(III)的准备有succinimide(SI)和N-hydroxysuccinimide(NHSI)的建筑群被报导,它进一步通过元素的化学分析,热分析,英尺红外,粉末X光检查衍射,SEM和荧光光谱学被调查。通过这些分析收集的数据揭示了Eu(III)的形成,有上面的Tb(III)建筑群对ligand在金属提及ligands(M:L)1:3的臼齿的比率。光中心从photoluminescent系列调查被保留的关于通过lanthanide的协作地点的有效促进感受性的有趣的结论。当时,强壮的光排放在Eu(III)-SI和Tb(III)-NHSI建筑群的情况下被观察-SI建筑群展出了的相应Eu(III)-NHSI和Tb(III)没有相片光性质。最新获得的光lanthanide建筑群可能具有为在光电子的各种各样的应用的特别兴趣。
简介:Pd@Zr/CeO2core-shellcatalystpreparedbyhydrothermalmethodwasappliedinCOoxidationreaction,exhibitinghighCOoxidationactivityatlowtemperature.XRD(X-raydiffraction)analysisdemonstratedthattheremarkableenhancementofcatalyticperformancewasfoundtodependonthepresenceofmoreoxygenvacanciesinthecore-shellstructure,whichcontributedhighercontentofandreadyreleaseofactiveoxygenspeciesatlowtemperature,confirmedbyH2-TPR(temperatureprogramedreduction)results.Interestingly,introducingasmallamountofzirconium(0.5wt.%)exhibitedasignificantimprovementofcatalyticactivitybecausetheintroductionofZrfurtherimprovedtheamountofcrystaldefectsandpromotedthemigrationofoxygenspecies.
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.
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简介:Fe/Cu/Cemodifiedcoal-basedactivatedcarbon(AC)waspreparedbythesol-gelmethod,andtheeffectofFe/Cu/CeoncatalyticpropertiesofFe/AC,Fe-Cu/ACandFe-Cu-Ce/ACwasinvestigatedinthehydrolysisofcarbonylsulfide(COS)at50°C.Theirsurfacepropertieswereevaluatedbymeansofnitrogenadsorptionandwerecharacterizedbyusingscanningelectronmicroscopy(SEM),X-raydiffracto-metry(XRD)andX-rayphotoelectronspectroscopy(XPS).ThecatalyticactivitiesresultsshowedthatadditionofCuandCe...
简介:我们在甲烷(POM)的部分氧化上调查了填满的格子氧的锻烧温度,反应温度,和不同数量的效果到把perovskite类型LaFeO3氧化物用作氧施主而不是气体的氧的合成气体,它被大音阶的第五音胶化方法准备,并且氧化物被XRD,TG/DTA,和赌注描绘。结果显示粒子尺寸增加了,锻烧温度增加,当赌注和CH4变换衰退了,锻烧温度当气体的氧不在时作为氧施主用LaFeO3氧化物增加时。在象上面那样的高水平仍然是的公司选择92%,并且当锻烧温度增加了,稍微增加了。到甲烷空气的LaFeO3氧化物的暴露提高了氧迁居在有由于格子氧和氧化说的Fe离子的减小的损失联机的时间的体积同时。高反应温度对从向为有高公司选择的合成气体生产的表面的体积的氧种类的迁居有利。为由顺序的氧化还原作用反应的POM的产品分发和进化被填满的格子氧的数量与气体的氧决定。最佳的过程应该衰退甲烷的全部的氧化,和增加甲烷的部分氧化的选择。
简介:AnovelTb(III)ternarycomplexTb(p-BBA)_3MAAwassynthesizedwith4-benzoylbenzoicacid(p-BBA)andmethacrylicacid(MAA)asligands.ThecomplexwascharacterizedbyIR,UV-visible,thermogravimetricanalysisandfluorescencespectroscopy.Monitoredat544nm,thecomplexdisplayedwideandstrongexcitationbandat300–400nm,whichmatchedwellwiththe365nm-emittingUVchip.Thecomplexexhibitedexcellentgreenemissionat544nm(~5D_4→~7F_5transitionofTb~(3+))underanexcitationat365nm.Besides,thecomplexshowedhighthermalstability.Itsintramolecularenergytransferprocesswasfurtherdiscussed.Furthermore,thecomplexalsohadhigherfluorescencelifetime(1.38ms)andhigherquantumyield(0.372).Finally,electroluminescentpropertiesindicatedthatwhenusedtofabricateLEDwith365nmUVchip(powerefficiencyis18.6lm/W),thecomplexremaineditsfavorableopticalperformance.TheseresultsimpliedthatTb(p-BBA)_3MAAcouldbeusedasagreenphosphorforNUV-basedwhiteLED.
简介:四lanthanide协作建筑群,也就是[行(2,3-DClBA)3(5,5-dmebipy)(H2O)]2(Ln=Sm(1),Eu(2),Dy(3),惊讶(4));2,3-DClBA=2,3-dichlorobenzoate;5,5-dmebipy=5,5-dmethylbipyridine)被元素的分析,红外线的光谱学和单个水晶X光检查衍射综合并且描绘。调查结果显示建筑群3是一个dinuclear分子,并且中心Dy3+是八坐标的。每个dinuclear单位能被H债券和卤素卤素相互作用连接。建筑群2的光性质建议了Eu3+离子的典型强烈排出物。热分析证明建筑群在三分解了步:协作水然后第一被失去中立ligand5,5dmebipy被失去,最后,2,3-DClBAligand被失去。
简介:RE-dopedNi-basedcatalystswerepreparedbysol-gelmethod.ThesecatalystswereappliedtothereactionofCO2reformingCH4tosyngas.ThestudiesrevealthatRE-doped(RE=La,Ce,Sm,Yb)Ni-basedcatalystsshowhighercatalyticactivitythanundopedNi-basedcatalyst,andwiththeincreasingofRE-dopedquantity,thecatalyticactivityofcatalystsexhibitsregularchanges.WhenRE-dopedquantityis0.2%(molarratio),thecatalystsshowthebestcatalyticactivity.
简介:TwonovelwashcoatsCe0.8Zr0.15La0.05OδandCe0.8Zr0.2O2waspreparedbyanimpregnationmethod,whichactedasahostfortheactivePdcomponenttopreparePd/Ce0.8Zr0.15La0.05Oδ/substrateandPd/Ce0.8Zr0.2O2/substratemonolithiccatalystsfortoluenecombustion.ThewashcoatswascharacterizedbyX-raydiffraction(XRD),Ramanspectroscopy,Brunauner-Emmett-Teller(BET),andH2-temperature-programmedreduction(H2-TPR).Theresultindicatedthatboththewashcoatshadstrongvibration-shockresistanceaccordingtoultrasonictest.DopingLa3+intoCeO2-ZrO2solidsolutioncouldgeneratemoreoxygenvacancies,andcouldinhibitthesinterofCeO2-ZrO2solidsolutionwhencalcinedathightemperatures(800,900and1000°C).ThewashcoatCe0.8Zr0.15La0.05Oδhadmuchbetterredoxproperties.ThereductivetemperatureofCe4+speciesshiftedtolowtemperatureby60°Cwhenthewashcoatscalcinedathightemperatures(800,900and1000°C).ThePd/Ce0.8Zr0.15La0.05Oδ/substratemonolithiccatalystcalcinationat500°Chadthebestcatalyticactivityandthe95%tolueneconversionatatemperatureaslowas190°C.Whencalcinedatlowtemperature(500and700°C),thecatalyticactivityhaslittleimprovement,however,whencalcinedathightemperature,thecatalyticactivityofPd/Ce0.8Zr0.15La0.05Oδ/substratemonolithiccatalystshadsignificantimprovement.Ascatalystwashcoat,theCe0.8Zr0.15La0.05OδhadbetterthermalstabilitythanthewashcoatCe0.8Zr0.2O2,thedevelopedPd/Ce0.8Zr0.15La0.05Oδ/substratemonolithiccatalystinthisworkwaspromisingforeliminatingVolatileorganiccompounds.
简介:缩放Nano的氧化钇粒子基于含水的钇硝酸盐和乙二醇经由非水的sol-gelprocess被综合。到雏晶上的钇离子和锻烧温度的乙二醇的臼齿的比率的效果产品缩放我们再学习。为铵perehlorate(AP)的同样准备的氧化钇的催化表演分解被微分扫描调查热量测定(DSC)。结果显示有在平均雏晶尺寸的不到20nm的缩放nano的立方的氧化钇粒子能在70degC在2h倒流以后被获得,在90degC弄干,形成xerogel,并且由为2hxerogel退火列在后面,并且到AP的缩放nano的氧化钇的增加在温度合并AP的二座小发热的山峰,这310~变化350degC并且400-470degC进AP和增加的一座强壮的发热的山峰从515的明显的分解热到超过1110Jcentre点g~(-1)。发热的山峰减少和明显的分解AP加热的AP分解的温度随数量的增加增加缩放ofnano的氧化钇,也是清楚的。到AP的5%缩放nano的氧化钇的增加减少的事实到由114.6degC的减小的337.7degC的AP发热的山峰的温度,并且从515~1240J中心点g~增加明显的分解热(-1),揭示那缩放nano的氧化钇hows为AP的强壮的催化性质热分解。