简介:Withcoalgasasareducingagent,thecatalyticreductionofSO2tosulfurinthefluegasproducedinmetallurgicalprocesseswasstudiedovercatalystsofrareearth-Fe/Al2O3(REFe/Al2O3).ThecatalyticactivityoftheREFe/Al2O3catalystonthereductionofSO2tosul-furwasinvestigatedbasedonkindsandthecontentsofrareearthsanddifferentpreparationmethodofthecatalyst.Additionally,themecha-nismofthiscatalyticreductionreactionwasalsoexplored.ResultsshowedthatdifferentrareearthimposeddifferenteffectontheactivityoftheFe/Al2O3catalyst.Especially,theadditionofSmandDygreatlyimprovedthecatalyticactivityofFe/Al2O3.TheyieldofsulfuroverSmFe/Al2O3wasincreasedto86.62%at360℃,whichwas40.5%higherthanthatoverFe/Al2O3atthesametemperature;andthesulfuryieldoverDyFe/Al2O3wasincreasedto91.62%at400℃,26.4%higherthanthatoverFe/Al2O3.ThecatalyticactivityofREFe/Al2O3wassomehowdependentonthecontentofrareearth.ForSmFe/Al2O3,thecontentofSmwasoptimizedtobeabout1.0wt.%.Therareearthcatalystpreparedwithdifferentmethodsalsoshowedvariedactivity.Thesulfuryieldoverrare-earthtransitionmetalcatalystsfollowstheorder:SmandironsolutionmixingimpregnationSmfirst,thenironsolutionimpregnationironfirst,thenSmsolutionimpregnation.ThereactionmechanismofSO2reductiontosulfurwithcoalgaswasproposedtobeanintermediatemechanism.
简介:TheNd3+3.2%(atomfraction):KGd(WO4)2crystalwasgrownbyKyropoulosmethod.TheabsorptionspectrumandfluorescencespectrumofNd3+:KGWcrystalweremeasured.Theabsorptioncrosssectionsat808nm(0.6799×10-20cm2)werecalculated,andtheoutputwavelengthoffluorescenceis1064and1351nm.Thediode-pumpedlaserwasoperatedbothinthefree-runningandpassivelyQ-switchedoperatingmodes.Themaximumlaseroutput(1064nm)is326mWwith62.7%slopeefficiencywheninputenergyis900mW.ThebeamqualityfactorM2≈1.1.Thegreenlightof532nmisobtainedinfrequencydoublingoperation.ThelaserispassivelyQ-switchedbyusingCr4+:LuAGassaturableabsorber.Thepulsewidthis170nsatrepetitivefrequencyof15kHZ.
简介:VariousopticalluminescencespectroscopictechniqueswereusedtocharacterizethehighTcsuperconductorYBa2Cu3Ox.TheemissionbandsrevealthatCu3+coexistwithCu2+andCu+inthismaterial.
简介:Inaflowinjectionseparationandpreconcentrationsystemincorporatingamicrocolumn,theadsorptionbehavior(effectofpH,kineticadsorptioncapacity)ofmetalionsCu^2+,Cr^3+,Mn^2+,Ni^2+,La^3+,Eu^3+,Ga^3+,Mo(Ⅵ)andW(Ⅵ)onTiO2owderwithdifferentcrystalstructureandparticlediameterwasstudiedandcompared.Inaddition,theechanismoftheadsorptionofmetalionsonTiO2owderwasexplored.TheresultsshowthatcrystaltructureandparticlediameteroftheTi02powderwillefinitelyaffecttheadsorptioncapacityofmetalsont.
简介:介绍SO2非稳定态氧化技术的工艺流程及特点,该技术在沈阳冶炼厂制酸系统的应用及改进,并取得了明显的节能效果。
简介:TheNaGd(WO_4)_2:Eu~(3+)phosphorswerepreparedbythemicroemulsionmediatedhydrothermalmethod.ThemorphologyandsizeofthesamplescouldbedependentonthepHintheinitialsolution.Thesephosphorsobtainedhadastrongabsorptionat395nmmatchingwiththepopularemissionofnear-UVLEDchips,andcouldemitintenseredlightat616nm.Thesmallellipsoid-likeparticlesorshortrodswereprovidedwithlargeparametersofoscillatorstrength?_2andasymmetryratio.Comparedtotheellipsoid-likephosphors,therod-likephosphorstookonstrongeremission,longerlifetimeandlargerquantumefficiency.Thisworkdemonstratedthattheone-dimensionNaGd(WO_4)_2:Eu~(3+)phosphorsmightbeamorefavorabledevicethanzero-dimensiononesforphotoluminescence.
简介:ThispaperistodiscussthesensingcharacteristicsofSnO2semiconductorcomponentsinwhichPr6O11isadded.Whenexperimentingunder11gasesofCH3COCH3,C2H5OH.C6H5CH3,H2,NH3,CO,CO2CH4,C4H10,n—C6H14andn—C7H16,wefindthatthecomponentshaveselectivitytoCH3COCH3,C2H5OHandthattheidealamountofPr6O11inthecomponentsisaboutI.Owt%.TheexperimentsalsoshowthatwiththeincreaseoftheamountofPr6O11,theidealworkingtemperature,theresponseandrestorationtimedecrease.