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11 个结果
  • 简介:我们综合了一系列Nb2Pd1xRuxS5多晶的样品由一固态反应方法并且系统地由运输和磁性的大小在超导性上调查了做Ru效果。超导性被提高,Ru做并且在混乱之上是相当柔韧的,这被发现。霍尔系数大小显示费用运输被类似于做的红外的案例的洞类型费用搬运人统治,建议多乐队超导性。在Ru或红外做之上,Hc2/Tc展出重要改进,超过泡利不相容原理由约4的一个因素的顺磁的限制价值。Tc和上面的关键字段的比较(在Pd地点上的不同的做元素之中的Hc2),揭示联合的纺纱轨道的一个重要角色。

  • 标签: 掺杂效应 超导电性 空穴 电荷输运 固相反应法 多晶样品
  • 简介:通过DSC和同步辐射WAXS技术测定了结晶温度对iPP和TMB-5/iPP结晶行为的影响.结果表明,随等温结晶温度升高,iPP总结晶度变化不大,但是β晶型含量降低的同时α晶型含量增加.TMB-5是一种具有温度依赖的选择性成核剂,当等温结晶温度高于140℃时,含TMB-5成核剂的iPP的β晶型的含量急剧降低.本文进一步探讨了TMB-5对iPP结晶行为影响的机理.

  • 标签: 等规聚丙烯 Β成核剂 结晶温度
  • 简介:Zn/ZSM-5(NZ2)andZn/Ni/ZSM-5(NZ3)asthecatalystsformethanoltoaromatics(MTA)weresynthesizedbyasimpleultrasonicimpregnation.ThetexturalandacidpropertiesofallcatalystswerecharacterizedusingXRD,HRTEM,NH3-TPD,Py-IR,XPS,XRFandTGtechniques.TheXRDandHRTEMresultsshowedthatthebasiczeolitestructureswerenotaffectedmuchwiththeincorporationofZnandNispecies.However,greatchangeshavetakenplaceinacidproperties.ThePy-IRandXPSresultsindicatedthattheZn-Lewisacidsites(ZnOH+species),whichhavestrongerinteractionwiththezeoliteframeworkcomparedwithZnOspecies,weregeneratedattheexpenseofBacidsiteswiththeincorporationofzincspecies.Moreover,theproductanalysisresultsshowedthattheincorporationofzincspeciespromotedtheprimaryaromatizationbyenhancingthedehydroaromatizationandsuppressingthecrackingandsubsequentH-transferreaction.Furthermore,theadditionofNispecieswellinhibitedthelossofzincspeciesbyconvertingpartialZnOspeciestoZnOH+species,andthusimprovedthearomatizationactivityandcatalyststability.ThecatalyticperformanceresultsshowedthattheNZ3possesshigherconversionofmethanolinalongertimeandloweraveragerateofcokeformationcomparedwithNZ2.Inaddition,theNZ3alsoexhibitedthehighestyieldofBTXasthereactionproceeds.

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  • 简介:CarbondepositionduringmethanoltohydrocarbonsleadstothequickdeactivationofZSM-5catalystanditisoneofthemajorproblemsforthistechnology.DecreasingthecrystalsizeorintroducingmesoporesintoZSM-5zeolitescanimproveitsdiffusionpropertyanddecreasethecokeformation.Inthispaper,nano-sizedZSM-5zeolitewithintercrystallinemesoporescombiningthemesoporousandnanosizedstructurewasfabricated.Forcomparison,themesoporousZSM-5andnano-sizedZSM-5werealsoprepared.ThesecatalystsampleswerecharacterizedbyXRD,BET,NH3-TPD,TEM,Py-IRandTGtechniquesandusedontheconversionofmethanoltogasolineinafixed-bedreactoratT=405°C,WHSV=4.74h-1andP=1.0MPa.Itwasfoundthattheexternalsurfaceareaofthenano-sizedZSM-5zeolitewithintercrystallinemesoporesreached104m2/g,largerthanthatofmesoporousZSM-5(66m2/g)andnanosizedZSM-5(76m2/g).Catalyticlifetimeofthenano-sizedZSM-5zeolitewithintercrystallinemesoporeswas93h,whichwasonlylongerthanthatofmesoporousZSM-5(86h),butshorterthanthatofnanosizedZSM-5(104h).Strongaciditypromotedthecokeformationandthusdecreasedthecatalyticlifetimeofthenano-sizedZSM-5zeolitewithintercrystallinemesoporesthoughitpresentedlargeexternalsurfacethatcouldimprovethediffusionproperty.Thespecialzeolitecatalystwasfurtherdealuminatedtodecreasethestrongacidity.Afterthis,itscokeformationratewasslowedandcatalyticlifetimewasprolongedto106hbecauseofthelargeexternalsurfaceareaanddecreasedweakacidity.Thisspecialstructuralzeoliteisapotentialcatalystformethanoltogasolinereaction.

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  • 简介:一系列1,3二度(2-alkyltetrazol-5-yl)triazenes被钠亚硝酸根的处理在高收益综合了并且盐酸有substituted-5-aminotetrazoles的酸。所有混合物充分用红外光谱学被描绘,1HNMR和13CNMR光谱学和高分辨率团分光计(HRMS)。大多数这些triazenes展出与TNT可比较、低的好爆炸性能融化从81的点??????獩硯穡汯湩吗?

  • 标签: 三氮烯 烯类 合成 官能化 NMR光谱 表征
  • 简介:Unlikeorganic–inorganichybridperovskites,all-inorganiccesiumleadhalideperovskitesholdgreatpromisefordevelopinghigh-performanceoptoelectronicdevices,owingtotheirimprovedstability.Herein,weinvestigatetheperovskite-relatedCsPb2Br5nanoplatelets(NPLs)withtunableemissionwavelengthsviachangingthereactiontemperaturesto100°C,120°C,and140°C.ReactiontemperatureplaysakeyroleindeterminingtheshapesandthicknessesoftheresultingCsPb2Br5NPLs.AhighertemperatureisinfavoroftheformationofsmallerandthickerNPLs.Todeveloptheirpotentialapplicationsinoptoelectronicdevices,greenlightemittingdiodes(LEDs)andphotodetectorsbasedonCsPb2Br5NPLsarefabricated.ThegreenLEDsbasedonCsPb2Br5NPLssynthesizedat140°Cexhibitanexcellentpuregreenemission(fullwidthathalf-maximumof<20nm)anddisplayaluminousefficiencyof34.49lm∕Wunderanoperationcurrentof10mA.Moreover,thephotodetectorbasedonCsPb2Br5NPLssynthesizedat100°Chasbetterperformancewitharisetimeof0.426s,adecaytimeof0.422s,andaratioofthecurrent(withandwithoutirradiation)of364%.

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  • 简介:Aserialofprotonatedandlayeredtransitionmetaloxides,includinglayeredHTaWO6,HNbMoO6aswellasHNbWO6,weresynthesizedbysolid-statereactionandion-exchange.ThelayeredHTaWO6hasbeensystematicallystudiedasasolidacidtorealizethedehydrationoffructoseto5-hydroxymethylfurfural(HMF).ThetransitionmetaloxidesampleswerecharacterizedwithICP-OES,EDS,XRD,XPS,SEM,TGA,FT-IR,N2adsorption–desorptionandNH3-TPD.Theinfluentialfactorssuchasreactiontemperature,reactiontime,solvent,catalystamountandsubstrateconcentrationweredeeplyinvestigated.Theoptimizedfructoseconversionrateof99%withHMFyieldof67%wereachievedafter30minat140°Cindimethylsulfoxide.

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  • 简介:NanosizedGa-containingZSM-5zeoliteswerepreparedviaisomorphoussubstitutionandimpregnationfollowedbycharacterizedusingvarioustechniques.Thecatalyticperformanceofthezeolitesforthearomatizationof1-hexenewasinvestigated.TheresultsindicatethatisomorphoussubstitutionpromotestheincorporationofGaheteroatomsintotheframeworkalongwiththeformationofextra-frameworkGaO+species([GaO+]a)thathavestrongerinteractionswiththenegativepotentialoftheframework.Inaddition,basedonthePy-IRresultsandcatalyticperformance,the[GaO+]aspecieswithstrongerLewisacidsitesproducedabettersynergismwithmoderateBr?nstedacidsitesandthusimprovedtheselectivitytoaromaticcompounds.However,theimpregnationresultsintheformationofGa2O3phaseandsmallamountsofGaO+speciesthataremainlylocatedontheexternalsurface([GaO+]b),whichcontributetoweakerLewisacidsitesduetoweakerinteractionswiththezeoliteframework.During1-hexenearomatization,thenanosizedGaisomorphouslysubstitutedZSM-5zeolitesamples(Gax-NZ5)exhibitedbettercatalyticperformancecomparedtotheimpregnatedsamples,andthehighestaromaticyield(i.e.,65.4wt%)wasachievedovertheGa4.2-NZ5sample,whichcontainedwiththehighestGacontent.

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  • 简介:建立了一种电感耦合等离子体质谱(ICP-MS)法测定环境水样中Cu、Zn、Mn、Pb、Cd5种重金属元素含量的方法。经过仪器条件优化和干扰校正后,方法中5种元素的工作曲线的相关系数均大于0.999,检出限为0.014-0.22μg/L。对加入国家标准物质作为质控样15个批次的环境水样进行统计分析并绘制质控图。同时与原子吸收光谱法测定结果进行对比分析,测定值与标准值基本一致,质控样的测定值基本都在控制线范围之内。结果表明,方法精密度和准确度均能满足环境水样的分析,ICPMS法更适用于大批量、多样化环境水样的监测分析。

  • 标签: 电感耦合等离子体质谱法 原子吸收光谱法 环境水样 重金属
  • 简介:Theneworganic-inorganiccompound,[C_6H_7N_2O_2]_3TeCl_5·2Clwassynthesizedanditsstructurewasdeterminedatroomtemperatureinthetriclinicsystem(P~-1)withthefollowingparameters:a=10.5330(11)?,b=10.6663(11)?,c=15.9751(16)?,α=82.090(2)°,β=71.193(2)°,γ=68.284(2)°andZ=2.ThefinalcycleofrefinementledtoR=0.057andRw=0.149.ThecrystalstructurewasstabilizedbyanextensivenetworkofN--H···Clandnon-classicalC--H···Clhydrogenbondsbetweenthecationandtheanionicgroup.Severalthermalanalysistechniquessuchasthermogravimetricanalysis,differentialscanningcalorimetricanalysisandevolvedgasanalysiswereused.Weusedisoconversionalkineticsmethodstodeterminethekineticsparameters.Weobservethatthedecompositionof[C_6H_7N_2O_2]_3TeCl_5·2Clentailstheformationhydrochloricacidofnitroanilineasvolatiles.Theinfraredspectrawererecordedinthe4000–400cm~(-1)frequencyregion.TheRamanspectrawererecordedintheexternalregionoftheanionicsublatticevibration50–1500cm~(-1).TheopticalbandgapwascalculatedfromtheUV-VisabsorbancespectrausingclassicalTaucrelationwhichwasfoundtobe3.12and3.67eV.

  • 标签: 结构分析 光学性质 合成 化合物 紫外-可见吸收光谱 差示扫描量热分析