简介:A60%Fe/Al2O3catalystwaspreparedbytheco-precipitationmethod.ItwasreducedbyH2toproducemetallicFe,whichwasthensulfidedbyCS2toFe0.96SandFe3S4orphosphidedbytriphenylphosphine(PPh3)inliquidphasestoFe2PandFeP.Itwasfoundthattheironsulfides(Fe0.96SandFe3S4)exhibitedthelowactivityforthehydrodesulfurization(HDS)reactions.TheHDSactivitywasalsolowontheFe(metal)/Al2O3andFe2P/Al2O3catalystssincetheywereconvertedintoFe0.96SandFe3S4duringtheHDSreactions.Incontrast,theFeP/Al2O3wasfoundtobestableandactivefortheHDSreactions.Inparticular,FeP/Al2O3possessedsignificantlysmallerFePparticlesthanFeP/C,leadingtothesignificanthigherHDSactivityofFeP/Al2O3thanFeP/C.
简介:WhileFe-basedoxygencarriers(OC)areregardedtobepromisingforchemicalloopingcombustion(CLC),thedecreaseofCO2selectivityduringdeepreductionprocessandthesevereagglomerationofFe2O3oftenoccuraftermultipleredoxcyclesduetothelowoxygenmobility.Herein,Fe-substitutedBahexaaluminates(BaFexAl12–xO19,denotedasBFxA-H,x=1and2)preparedbyamodifiedtwo-stepmethodexhibitednotonlyhigheramountofconvertedoxygen(Ot)andCH4conversion(77%and81%vs.17%and75%)thanthosepreparedbythetraditionalco-precipitationmethod(BFxA-C,x=1and2)butalsohighCO2selectivityabove92%duringthenearlywholereductionfromFe3+toFe2+.Furthermore,theBFxA-Hexhibitedtheexcellentrecyclabilityduring50cycles.ThebetterperformancewasascribedtothemarkedlyenhancedoxygenmobilitywhichresultedfromdominantoccupancyofFecationsinAl(5)sites(Fe5:71%and70%vs.49%and41%)inmirrorplanesofhexaaluminateleadingtolargeramountoflatticeoxygencoordinatedwithFe5(O–Fe5)(0.45and0.85mmol/gvs.0.31and0.50mmol/g).TheimprovementofoxygenmobilityalsofavoredthepreservationofchemicalstateofFecationsinhexaaluminatestructureinthere-oxidationstep,resultingintheexcellentrecyclabilityofBFxA-H.
简介:摘要随着注CO2气体时间的延长和注入量的增加,剖面均衡性变差,注入的CO2气体前沿缘会沿高渗透条带突进,导致油井采出流体中CO2含量远超出最初的开发预测数据,导致部分油井井口出油温度过低,甚至造成井筒冻堵。建立CO2原油混合体系在井筒流动中的温度、压力耦合模型,编制“井筒流动温度和压力耦合计算软件”,分析了CO2摩尔分数、日产油量及井深对井口采出液温度的影响。结果表明,随着CO2摩尔分数增加,井口采出液温度降低;相同CO2摩尔分数下,随着井深、日产油量的增加,井口采出液温度均表现为逐渐增加的趋势。此外,该软件界面友好,方便现场人员操作,具有一定的工程实际价值。
简介:[ 摘要 ]b>松南腰英台气田是高产出二氧化碳气田,为了解决降低松南气田碳排放问题,提出改善邻近腰英台油田特低渗高含水裂缝发育油藏水驱开发效果,同时为特低渗高含水储层 CO2驱油提高采收率探索经验, 2011年起在腰西 DB33区块开展了 CO2非混相驱先导试验,现场实施分为连续注气和水气交替两个主要阶段。松南气田为腰英台油田注 CO2试验提供了充分的前提条件,并且很好地解决了松南气田天然气中 CO2 不能直接排放到大气层的问题。通过对试验区生产动态变化研究,总结出气驱收效时间与效果,注气受效后产出物的变化规律研究,为在今后特低渗油田注 CO2开发提供了科学借鉴。
简介:Nanosheet(S)andnanoplate(P)γ-Al2O3weresynthesizedbysimplehydrothermalmethodsandemployedassupportsforNicatalystsinCO2methanation.BothofthenanostructuredNi/Al2O3catalystsdisplayedgoodactivity.Incomparison,theNi/Al2O3-ScatalystshowedhigherCO2conversionthantheNi/Al2O3-Pcounterpartatthereactiontemperaturerangingfrom250to400°C.ThephysicalandchemicalpropertiesofthecatalystsweresystematicallycharacterizedbyN2sorption,X-raydiffraction(XRD),highresolution-transmissionelectronmicroscopy(HR-TEM),hydrogentemperature-programmedreduction(H2-TPR)andCO2temperature-programmeddesorption(CO2-TPD)techniques.Higherspecificsurfaceareaandstrongermetal-supportinteractionswereconfirmedontheNi/Al2O3-Scatalyst,whichmayleadtosmallerparticlesizeofNinanoparticles.Moreover,theNi/Al2O3-Scatalystpossessedmoreabundantweakandmediumbasicsites,whichwouldbenefittheactivationofCO2.ThesmallerNisizeandmoresuitablebasicsitesmayrationalizethesuperioractivityoftheNi/Al2O3-Scatalyst.Besides,theNi/Al2O3-Scatalystexhibitedexcellentstabilityat325°Cfor40h.
简介:摘要压缩机是国民经济各部门必不可少的设备,应用十分广泛。压缩机绝大多数的故障发生在气阀上,分析了气阀所发生的各类故障及其发生的原因,并提出了合理的防治措施,从而延长了气阀的寿命,增大压缩机的产气量,降低功率消耗,提高了经济效益
简介:AfacilehydrothermalmethodwasdevelopedforthepreparationofFe2O3@CnanocompositesusingFeCl3·6H2Oasironsourceandglucoseascarbonsourceunderalkalinecondition.Themorphologyandstructureoftheas-preparedproductwereidentifiedbytransmissionelectronmicroscopy(TEM),highresolutiontransmissionelectronmicroscopy(HRTEM),field-emissionscanningelectronmicroscopy(FESEM),X-raydiffraction(XRD),Ramanspectroscopy,FourierTransforminfraredspectroscopy(FTIR),andthermogravimetricanalysis(TGA).Theas-prepareα-Fe2O3@Cnanocompositeswereemployedforsupercapacitorelectrodematerial.Thesynergisticcombinationofcarbonelectricaldouble-layercapacitanceandα-Fe2O3pseudo-capacitanceestablishedsuchnanocompositesasversatileplatformforhighperformancesupercapacitors.Thesynthesismethoddevelopedhereisexpectedtoobtainothermetaloxide/carboncomposite.