简介:拥有做位置的不同Ce的Pd和PdPt催化剂的物理化学的性质被TEM,XRD,N2吸附解吸附作用,XPS和英尺红外的技术调查。为甲醇总数氧化的催化表演被检验学习增加位置的Ce的效果。CeO2艾尔2O3Ce直接被介绍进支持的TiO2(猫)催化剂比CeO2/Al22选择>O3Ce被受精在装载的TiO2(Ce/AT)样品方法。描述结果表明做位置的Ce不引起基本水晶的阶段的明显的另一和支持的mesoporous结构。然而,做位置的Ce影响支持的毛孔形状然后影响毛孔直径。猫催化剂拥有更丰富的吸附的氧和更多Ti3+能在催化剂表面上把更气体的氧转变成活跃的氧种类,它对反应有益。在猫的AlOTi桥便于艾尔和Ti种类的合作,它进一步加快反应率。
简介:CeZr,CeYZr,LaCeZr,LaCePrZr,LaCePrYZr,和LaCePr稳固的答案经由一起沉淀方法被准备,并且借助于X光检查衍射(XRD)和Brunauer-Emmett-Teller(赌注)技术描绘了。稳固的答案的氧存储能力(振荡)被脉搏技术评估,催化活动用一台4隧道催化作用设备被估计。稳固的答案介绍了立方的结构,这被看见。特定的表面区域和热稳定性能被做Y进稳固的答案提高。当做大量La减少了时,做La的小数量在热耐久性上有积极效果特定的表面区域和热稳定性。LaCePrZr和LaCePrYZr固体解决方案用在Nd抽取在特定的表面区域和热稳定性介绍了某个更高的值以后,与LaCePr充实的Baotou稀土元素矿物质残余综合了,当为汽车的经济催化剂用尽纯化,从而启用被过去常。ceria氧化锆固体答案的表面上的涂层Al2O3或SiO2层增加了特定的表面区域和热抵抗。
简介:InordertoinvestigatetheeffectofCe-dopingonthecatalystsderivedfromhydrotalcite-likeprecursorsforcarbonylsulfide(COS)hydrolysis,aseriesofZn-Ni-Al-Cehydrotalcite-likecompoundswerepreparedbyco-precipitationmethodandthecatalyticactivityoftheirderivedcompositeoxideswerestudiedat50oC.TheeffectonthestructuralpropertiescausedbyCedopingwasstudiedbytheX-raydiffractometer(XRD),scanningelectronmicroscopy(SEM)andenergydispersivespectrometer(EDS).ThecatalyticactivitiesresultsshowedthatadditionofCeenhancedthecatalyticactivitiessignificantly,butexcessiveCe-dopinghadanegativeeffectonCOShydrolysis.XRD,SEMandEDSresultsillustratedthat,comparedwiththeCe-freesample,theparticlesizeofoxidesolidsdecreasedandthedegreeofdispersionincreasedduetoCedoping.
简介:稀罕做地球的铜锰混合了氧化物催化剂被一起沉淀并且用铜硫酸盐,锰硫酸盐,和稀土元素的氧化物REO的机械混合准备(REO显示La2O3,CeO2,Y2O3,或Pr6O11)作为原料。样品被X光检查描绘衍射(XRD),规划温度的减小(TPR),氧化表面(s-TPR)的规划温度的减小,和规划温度的解吸附作用(TPD)。催化活动为水气体移动反应被测试。做稀土元素氧化物没改变原来的铜锰的水晶结构混合了氧化物,但是改变了interplanar间距,吸附表演和反应性能。与La2O3提高了这项活动,因为高铜分发和好减小,Cu-Mn的稳定性混合了氧化物。与CeO2和Y2O3也减少了到不同的度的样品的减小温度当在表面上改进Cu的分散时,这样,催化活动比undopedCu-Mn的好样品。Pr6O11-doped样品是困难的减少,表面铜的分散被降低,导致穷人活动。
简介:VariousaffectingfactorsanddegradationmechanismwerestudiedonultrasonicdegradationofmethylorangeadoptingY2O3dopinganataseTiO2catalystpreparedinlaboratory.Intheexperiment,theUV-VISspectrophotometerwasusedtofollowandinspectthedegradationprocessofmethylorange.TheresultsindicatethattheultrasonicdegradationratiosofmethylorangeinthepresenceofanataseTiO2catalystaremuchbetterthanthosewithoutcatalyst.Moreover,thecatalyticperformanceofY2O3dopinganataseTiO2catalystisobviouslyhigherthanthatofanataseTiO2catalystwithoutdoping.TheoptimalconditionswereadoptedinthisworkandthedegradationandCODeliminationratioofmethylorangegotto98%and99.0%in90min,respectively.
简介:Ba0.85Ca0.15Ti0.9Zr0.1O3(BCTZ)lead-freepiezoelectricceramicsco-dopedwithCeO2(x=0.1wt.%,0.2wt.%,0.3wt.%,0.4wt.%,0.5wt.%)andLi2CO3(0.6wt.%)werepreparedbyconventionalsolid-statereactionmethod.InfluenceofCeO2dopingamountonthepiezoelectricproperties,dielectricproperties,phasecompositionandmicrostructureofpreparedBCTZlead-freepiezoelectricceramicsdopedwithLi2CO3wereinvestigatedbyX-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)andotheranalyticalmethods.TheresultsshowedthatthesinteredtemperatureofBCTZlead-freepiezoelectricceramicsdopedwithCeO2decreasedgreatlywhenLi2CO3dopingamountwas0.6wt.%;apureperovskitestructureofBCTZlead-freepiezoelectricceramicsco-dopedwithLi2CO3andCeO2andsinteredat1050°Ccouldalsobeobtained.Thepiezoelectricconstant(d33),therelativepermittivity(εr)andtheplanarelectromechanicalcouplingfactor(kp)ofBCTZceramicsdopedwithLi2CO3increasedfirstlyandthendecreased,thedielectricloss(tanδ)decreasedfirstlyandthenincreasedanddecreasedatlastwhenCeO2dopingamountincreased.TheinfluenceofCeO2dopingonthepropertiesofBCTZlead-freepiezoelectricceramicsdopedwithLi2CO3werecausedby'softeffect'and'hardeffect'piezoelectricadditiveandcausinglatticedistortion.WhenCeO2dopingamount(x)was0.2wt.%,theBCTZceramicsdopedwithLi2CO3(0.6wt.%)andsinteredat1050°Cpossessedthebestpiezoelectricpropertyanddielectricpropertywithd33of436pC/N,kpof48.3%,εrof3650,tanδof1.5%.
简介:试图为高温度的熔融的盐反应堆的安装和电极的建设开发材料,在750和950湩爠晥湩浥湥?瑳敲杮桴湥湩?猠汯摩猠汯瑵潩?瑳敲杮桴湥湩?眠牯?慨摲湥湩?愠摮瀠敲楣楰慴楴湯猠牴湥瑧敨楮杮的Ni-11Fe-10Cu的高温度的氧化行为上的艾尔和Y的效果
简介:AseriesofCeB6-dopedandCeO2-dopedCa1-xSiAlN3:xCe3+(denotedasCASN:Ce3+@CeB6andCASN:Ce3+@CeO2,respectively)weresynthesizedbyalloy-nitridationmethodunderhigh-puritynitrogenatmosphere.Themorphologies,crystalphases,andluminescencepropertieswereinvestigatedindetail.WithanincreaseintheconcentrationofCeB6,theunitcellvolumeofCASN:Ce3+@CeB6slightlyincreasesduetothesubstitutionbetweenions,whichleadstoachangeofmicrostructurearoundCe3+.CASN:Ce3+@CeB6efficientlyemitsyellow-orangelightwithamaximumemissionintensityataround550nmforthecontentxof0.01(beingincomparablesituation,CASN:Ce3+@CeO2isx=0.04)whenexcitedat460nm.ComparedwithCASN:Ce3+@CeO2,theredemissioncomponentofCe3+inCASN:Ce3+@CeB6ismuchstronger.Thisisascribedtoenergytransferofintra-Ce3+(withinoneCe3+ion)andinter-Ce3+(betweenCe3+andCe3+ions).Inaddition,thereplacementsofN3-(0.132nmforCN=4)andO2-(0.124nmforCN=4)byB2-(0.140nmforCN=4),whichcanleadtoamarkedexpansionofthehostlatticeandadecreaseoftheoxidationofsamples,arealsoresponsiblefortheincreaseofredemissioncomponent.Furthermore,CASN:Ce3+@CeB6phosphorhasanexcellentthermalstabilitybecauseofthepartialsubstitutionofCe-O(Ce-N)bondsbymorecovalentCe-B.Asaresult,theoutstandingluminescentpropertiesofCASN:Ce3+@CeB6phosphormakeitpracticaltouseinthesinglephosphor-coatedhigh-color-renderingpowerwhiteLED.
简介:Sr1.995–1.5xGdxSiO4:0.005Eu2+phosphorserieswithx=0–0.08molfornear-ultravioletwhitelight-emittingdiodes(NUVw-LEDs)weresynthesizedviasolid-statereactionmethod.XRDprofilepatternandrefinementresultsdemonstratedthatdopingGd3+ionsresultedinthephasetransformation(β-Sr2SiO4→α’-Sr2SiO4).Thephotoluminescencespectrumofthesamplewithx=0moldisplayedtwoemissionpeakscenteredat470and525nm.Thetwo-peakspectrabecameone-peakspectrawiththeGd3+concentrationincreasing.Actually,thefittingresultsdemonstratedthattheone-peakspectrawerestillcomposedoftwosingleemissionspectra.ThephotoluminescenceintensitywasimprovedandtheCIEchromaticitycoordinateswereadjustedviadopingGd3+.