简介：Chemicalloopingdryreforming（CLDR）isaninnovativetechnologyforCO2utilizationusingthechemicalloopingprinciple.TheCLDRprocessconsistsofthreestages,i.e.CH4reduction,CO2reforming,andairoxidation.Spinelnickelferrite（NiFe2O4）waspreparedanditsmulti-cycleperformanceasanoxygencarrierforCLDRwasexperimentallyinvestigated.X-raydiffraction（XRD）andLaserRamanspectroscopyshowedthatapurespinelcrystallinephase（NiFe2O4）wasobtainedbyaparallelflowco-precipitatingmethod.NiFe2O4wasreducedintoFe-Nialloyandwustite（FexO）duringtheCH4reductionprocess.SubsequentoxidationofthereducedoxygencarrierwasperformedwithCO2asanoxidanttoformanintermediatestate:amixtureofspinelNi1-xFe2+xO4,Fe2+yO4andmetallicNi.AndCOwasgeneratedinparallelduringthisstage.Approximate185mLofCOwasgeneratedfor1gspinelNiFe2O4inasinglecycle.TheintermediateoxygencarrierwasfullyoxidizedintheairoxidationstagetoformamixtureofNi1+xFe2-xO4andFe2O3.Althoughtheoriginalstateofoxygencarrier（NiFe2O4）wasnotfullyregeneratedandagglomerationwasobserved,agoodrecyclabilitywasshownin10successiveredoxcycles.更多还原

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简介：Inthispaperstudyonthepropertyandmechanismofadsorptingrheniumfromaqueoushydrochloricacidbyusingmethylphosphorousaciddimythylheptylesterlevextrelresin(CL-P350)isreported.Theeffectsoftime,acidity,concentrationofrhenium,andtemperatureontheadsorptionofrheniumwereinvestigated.ThemechanismofadsorptingrheniumwasdiscussedbychemicalanalyticandIRmethod,anddynamicadscrptionandelutionwerestudied.Experimentalresultsshowthattheadsorptionequilibrationisreachedin4min,thedistributioncoefficient(D)ofRe(Ⅶ）increaseswithincreaseofconcentrationofHClandreachesmaximum3.0-4.0moL/LHCl.ReO4^-istakenupbyionassociationmechanismandcanbedescribedbyLangmuirequationoftheequilibriumstate.ThethermodynamicparametersintheadsorptionprocessofReO4^-havebeendeterminedtobe:ΔH=-29KJ/moL,ΔG=-25KJ/moLandΔS=-13.5J/moLrespectively.Thesaturationadsorptioncapacityofrheniumis19.2mg/gwhenthesolutioncontaining0.372g/LReand3.0mol/LHClwaspassedthroughtheresincolumn.Therecoverypercentageofrheniumis98.4%whiledistilledwaterwasusedasaneluent.

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简介：Inthepresentwork,aninterconnectedsandwichcarbon/Si-SiO2/carbonnanospherescompositewaspreparedbytemplatemethodandcarbonthermalvapordeposition（TVD）.ThecarbonconductivelayercannotonlyefficientlyimprovetheelectronicconductivityofSi-basedanode,butalsoplayakeyroleinalleviatingthenegativeeffectfromhugevolumeexpansionoverdischarge/chargeofSi-basedanode.Theresultingmaterialdeliveredareversiblecapacityof1094mAh/g,andexhibitedexcellentcyclingstability.Itkeptareversiblecapacityof1050mAh/gover200cycleswithacapacityretentionof96%.

简介：Amantadine(AMA)是在养蜂过去常保护蜜蜂免于sacbrood病毒(Moratoraetatulae)的抗病毒的药。这研究描述了可靠高效的液体色析法(HPLC)为用稳固阶段的抽取(SPE)在蜂蜜分析AMA的方法为纯化的子弹(PlexaPCX)，4-fluoro-7-nitro-2,1,3-benzoxadiazole(NBD-F)作为一个列前derivatization代理人，和fluorometric察觉(ex=470nm，em=530nm)。色析法的分离在XDBC18列上被执行(150

简介：orthotropic与为平凡高度的温度参数的组成的关系--力量在biaxial压缩下面的高效的水泥(HSHPC)被开发。它基于为包括伪=蟽2在7不同压力比率在HSHPC的二个力量层次描绘力量和变丑行为执行的实验：蟽3=0.00：?1，?0.20：?1，?0.30：?1，?0.40：?1，?0.50：?1，?0.75：?1，?1.00：?1在到20，200，300，400，500和600掳C的正常、高的温度的暴露以后，并且用一台大静电干扰动态的真triaxial机器。biaxial测试在100公里脳上被执行100公里脳100公里立方的标本，和减少磨擦的垫被使用为压缩装载飞机与甘油中立者由塑料膜的三层组成。基于试验性的结果，HSHPC标本的失败模式被描述。主要静态的压缩力量，在山峰应力的紧张和压力紧张曲线被测量；并且他们上的温度和压力比率的inuence也被分析。试验性的结果证明在到高温度的暴露以后的平凡HSHPC的单轴的压缩力量不随温度的增加戏剧性地减少。到它的单轴的压缩力量的biaxial的比率在暴露以后取决于压力比率和HSHPC的易碎物僵硬到不同温度层次。从理论模型和试验性的数据获得的压力紧张结果的比较显示好同意。

简介：Hydrousrutheniumoxide（h-RuO2）nanoparticlesanditscompositewithmultiwalledcarbonnanotubes（h-RuO2/MWCNT）weresynthesizedbyasimplehydrothermalmethodandprovedtohavepotentialapplicationashybridsupercapacitormaterial.Theh-RuO2andh-RuO2/MWCNTwerecharacterizedfortheirphysico-chemicalpropertiesbyPXRD,BETsurfacearea,Raman,SEM-EDSandTEMtechniques.Theelectrochemicalperformanceofthematerialswereinvestigated,specificcapacitance（Cs）ofh-RuO2andhRuO2/MWCNTestimatedbytheircyclicvoltammetricstudieswerefoundtobe604and1585F/grespectivelyatascanrateof2mV/sinthepotentialrange0–1.2V.Further,thisvaluewasfoundtobenearlythreetimeshigherthanthatofpureh-RuO2.Anasymmetricsupercapacitor（AS）devicewasfabricatedbyemployingh-RuO2/MWCNTasthepositiveelectrodeandactivatedcarbonasthenegativeelectrode.ThedeviceexhibitedCsof61.8F/gatascanrateof2mV/s.Further,thedeviceshowedexcellentlongtermstabilityfor20,000cycleswith88%capacitanceretentionatahighcurrentdensityof25A/g.

简介：Nanostructuredmetaloxidesderivedfrommetalorganicframeworkshavebeenshowntobepromisingmaterialsforapplicationinhighenergydensitylithiumionbatteries.Inthiswork,porousnanostructuredZnCo2O4andCo3O4weresynthesizedbyafacileandcost-effectiveapproachviathecalcinationofMOF-74precursorsandtestedasanodematerialsforlithiumionbatteries.ComparedwithCo3O4,theelectrochemicalpropertiesoftheobtainedporousnanostructuredZnCo2O4exhibithigherspecificcapacity,moreexcellentcyclingstabilityandbetterratecapability.Itdemonstratesareversiblecapacityof1243.2mAh/gafter80cyclesat100mA/gandanexcellentrateperformancewithhighaveragedischargespecificcapacitiesof1586.8,994.6,759.6and509.2mAh/gat200,400,600and800mA/g,respectively.ThesatisfactoryelectrochemicalperformancessuggestthatthisporousnanostructuredZnCo2O4ispotentiallypromisingforapplicationasanefficientanodematerialforlithiumionbatteries.

简介：AnanostructuredNiAPSO-34catalystwashydrothermallysynthesizedandtheeffectofthetemplate（diethylamine（DEA）,tetraethylammoniumhydroxide（TEAOH）andDEA/TEAOH）onthephysicochemicalpropertiesandcatalyticperformanceinthemethanoltoolefin（MTO）reactionwasinvestigated.ThesampleswerecharacterizedbyX-raydiffraction,fieldemissionscanningelectronmicroscopy（FESEM）,particlesizedistributionanalysis,energy-dispersiveX-rayspectroscopy,Brunauer-Emmett-TelleranalysisandFouriertransforminfraredspectroscopy.TheX-raydiffractionpatternsindicatedahighercrystallinityandlargercrystallitesizeforthecatalystsynthesizedusingtheDEAtemplate.TheFESEMresultsindicatedthatthenatureofthetemplatecouldaffectthemorphologyofthenanostructuredNiAPSO-34catalystbecauseofitseffectontherateofcrystalgrowth.ThecatalyticperformanceofthesampleswasstudiedintheMTOreactionatatmosphericpressureandaspacevelocityof4200cm3/(gh-1)inafixedbedreactor.ThestabilityandactivityoftheNiAPSO-34catalystwereimprovedusingtheDEAtemplatebecauseofitshighercrystallinity,surfaceareaandthegreaterextentofNiincorporationintoitsframework.ThepossiblestagesofsynthesisandthereactionmechanismfortheMTOprocessoverNiAPSO-34arediscussedindetail.

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：ThecatalyticactivitiesofMnOx-WO3/TiO2forselectivecatalyticreduction(SCR)ofNOwithNH3wereinvestigatedinawiderangeoftemperatureandreactioncondition.ItyieldedaNOxconversionof80.3%-99.6%andaN2productselectivityof100%-98.7%during100°Cto350°Catgashourlyspacevelocity(GHSV)=18900h-1.Inthepresenceof0.01%SO2and6%H2Oat120°C,theNOxconversioncanmaintain98.5%.At300°Candwith0.07%SO2inreactantstream,theNOxconversionstabilizedat99%ashighasthecommercialV-W/TiO2catalyst'slevel.Thesteady-statekineticsstudyshowsthatO2playedapromotingrole.Inthepresenceoflessthan1.5%O2,NOxconversioncanincreasesharplywiththeincreaseofO2concentration.ThereactionorderwaszerowithrespecttoNH3andfirstwithrespecttoNOwithexcessO2andH2O.Thekineticsactiveenergy(Ea)ofMn-W/TiO2wascalculatedtobe6.24kJ/molaccordingtothekineticexperimentatvarioustemperatures,muchlowerthanthoseofothercatalystsreportedintheliterature.Mn-W/TiO2isanexcellentcatalystforSCRofNOwithNH3bynow.

简介：Theeffectofpromotercobaltandthesequencesofaddingcobaltandmolybdenumprecursorsontheperformanceofsulfur-resistantmethanationwereinvestigated.AllthesesampleswerepreparedbyimpregnationmethodandcharacterizedbyN2-adsorption,X-raydiffraction(XRD),temperature-programmedreduction(TPR)andlaserRamanspectroscopy(LRS).TheconversionsofCOforMo-Co/Al,Co-Mo/AlandCoMo/Alcatalystswere59.7%,54.3%and53.9%,respectively.Amongthesecatalysts,theMo-Co/AlcatalystpreparedstepwiselybyimpregnatingMoprecursorfirstlyshowedthebestcatalyticperformance.Meanwhile,theconversionsofCOwere48.9%forMo/Alcatalystand10.5%forCo/Alcatalyst.TheadditionofcobaltspeciescouldimprovethecatalyticactivityofMo/Alcatalyst.TheN2-adsorptionresultsshowedthatCo-Mo/Alcatalysthadthesmallestspecificsurfaceareaamongthesecatalysts.CoMoO4speciesinCoMo/AlcatalystweredetectedwithXRD,TPRandLRS.Moreover,crystalMoS2whichwasreportedtobelessactivethanamorphousMoS2wasfoundinbothCo-Mo/AlandCoMo/Alcatalysts.Mo-Co/Alcatalystshowedthebestcatalyticperformanceasithadanappropriatesurfacestructure,i.e.,nocrystalMoS2andverylittleCoMoO4species.

简介：Inthisstudy,nano-polyanlineandmanganeseoxidenanometertubularcomposites(nano-PANI@MnO2)werepreparedbyasurfaceinitiatedpolymerizationmethodandusedaselectrochemicalcapacitorelectrodematerials;andtheeffectofanilineamountonthemicrostructureandelectrochemicalperformancewasinvestigated.Themicrostructuresandsurfacemorphologiesofnano-PANI@MnO2werecharacterizedbyX-raydiffraction,scanningelectronmicroscopyandfouriertransformationinfraredspectroscope.Theelectrochemicalperformanceofthesecompositematerialswasperformedwithcyclicvoltammetry,charge–dischargetestandelectrochemicalimpedancespectroscopy,respectively.TheresultsdemonstratethatthefeedratioofanilinetoMnO2playedaveryimportantroleinconstructingthehierarchicallynano-structure,whichwould,hence,determinetheelectrochemicalperformanceofthematerials.UsingthetemplateassistedstrategyandcontrollingthefeedratioofanilinetoMnO2,thenanometertubularstructureofnanoPANI@MnO2wasobtained.Amaximumspecificcapacitanceof386F/gwasachievedinaqueous1mol/LNaNO3electrolytewiththepotentialrangefrom0to0.6V(vs.SCE).

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简介：TheHongKongObservatory(HKO)provideslow-levelturbulencealertingservicefortheHongKongInternationalAirport(HKIA)throughthewindshearandturbulencewarningsystem(WTWS).IntheWTWS,turbulenceintensitiesalongtheflightpathsoftheairportareestimatedbaseduponcorrelationequationsestablishedbetweenthesurfaceanemometerdataandtheturbulencedatafromresearchaircraftbeforetheopeningoftheairport.Theresearchaircraftdataarenotavailableonday-to-daybasis.Theremotesensingmeteorologicalinstruments,suchastheDopplerlightdetectionandranging(LIDAR)andradar,maybeusedtoprovidedirectmeasurementsofturbulenceintensitiesovertherunwaycorridors.TheperformancesofLIDAR-andradar-basedturbulenceintensitydataarestudiedinthispaperbasedonactualturbulenceintensitymeasurementsmadeon423commercialjetsforatypicalcaseofterrain-inducedturbulenceinassociationwithatyphoon.Itturnsoutthat,withthetuningoftherelativeoperatingcharacteristic(ROC)curvebetweenhitrateandfalsealarmrate,theLIDAR-basedturbulenceintensitymeasurementperformsbetterthantheanemometer-basedestimationofWTWSforturbulenceintensityatmoderatelevelorabove.Ontheotherhand,theradar-basedmeasurementdoesnotperformaswellwhencomparedwithWTWS.BycombiningLIDAR-andradar-basedmeasurements,theperformanceisslightlybetterthanWTWS,mainlyasaresultofcontributionfromLIDAR-basedmeasurement.Asaresult,theLIDAR-basedturbulenceintensitymeasurementcouldbeusedtoreplaceanemometer-basedestimatefornon-rainyweatherconditions.Furtherenhancementsofradar-basedturbulenceintensitymeasurementinrainwouldbenecessary.

简介：Li4Ti5O12（LTO）/carbonnanotubes（CNTs）compositematerialissynthesizedbasedonasolid-statemethodbysand-milling,spray-dryingandcalciningat8508CunderN2flow.TheLTO/CNTssampleswith1wt%and3wt%weightratioofCNTsadditionandthepristineLTOsampleareprepared.TherateperformanceandthethermalstabilityofthesesamplesareinvestigatedbasedonLiMn2O4（LMO）/LTOfull-cell.TheresultsshowthattheweightratioofCNTsadditionhasdistincteffectonLTOperformances.ThecompositematerialsofLTOcompositedCNTshavebetterperformanceathigh-rateduetotheintercalationenhancementbyconductivenetworkofCNTs.Atsecond,theoverchargingtemperatureresponseofthecell’ssurfacewith1wt%CNTsadditionisthelowest.Theparticlesizedistributionismeasuredandthemostuniformparticlesareobtainedwith1wt%CNTsaddition.ThistrendcouldexplainthatthemediumquantityofCNTsisoptimaltoimprovetheheatandmasstransferandpreventtheproblemsofcrystallitegrowinginterferenceandaggregationduringthecalcinationprocess.