简介:Inthisstudy,titaniumdioxidesupportedbymulti-walledcarbonnanotubes(MWCNTs/TiO2)andCr-dopedTiO2supportedbyMWCNTs(MWNTs/Cr-TiO2)weresynthesizedbythesol-gelmethod.Thepreparedsampleswerecharacterizedbytransmissionelectronmicroscopy,X-rayphotoelectronspectroscopy,X-raydiffraction,theBrunauerEmmett-Telleranalysis,andtheRamanspectroscopy.TheoxidationandefficiencyforremovalofSO2inasimulatedfluegaswereinvestigatedexperimentallyinafixed-bedreactor.The15%MWCNTs/Cr-Ti02sampledisplayedexcellentadsorptionproperties,andaSO2removalrateequatingto30.4151mg/gfromthesimulatedfluegascontaining2300μg/gofSO2,8%of02,and5%ofH20wasachievedunderoptimalconditionscoveringatemperatureof333.15K,andaspacevelocityof1275h^-1.TheadsorptionprocesswasenhancedbecauseCrdopingmodifiedtheporestructureandinhibitedthegraingrowthofTiO2.Inaddition,theFreundlichandLangmuirmodelsrevealedthatSO2wasmainlyadsorbedthroughchemicaladsorptiononthesamplesurfaces,andthethermodynamicmodelanalysisindicatedthattheadsorptionwasaspontaneous,exothermic,andentropy-reducingprocess.TheadsorptionkineticsofSO2canbedescribedbythepseudosecond-orderkineticandtheBanghamdynamicsmodels.Thepossiblereactionmechanisminvolvedindesulfurizationprocesswasalsoproposed.
简介:AninnovativeapproachtoH2Scapturehasbeendevelopedusingseveralmetal-basedionicliquids([Bmim]Cl·CuCl2,[Bmim]Cl·FeCl3,[Bmim]Cl·ZnCl2,[Bmim]Br·CuCl2,and[Bmim]Br·FeCl3)immobilizedonthesol-gelderivedsilica,whichissuperiortopurelyviscousionicliquidwithacruciallimitofhightemperature,lowmasstransferrate,andmassloss.TheadsorbentswerecharacterizedbytheFouriertransforminfraredspectrometer,transmissionelectronmicroscope,N2adsorption/desorption,X-rayphotoelectronspectroscopy,andthermalanalysistechniques.TheeffectsofthemetalandhalogeninIL,theloadingamountofIL,andtheadsorptiontemperaturewerestudiedbydynamicadsorptionexperimentsatagasflowrateof100mL/min.TheH2Sadsorptionresultshaveshowedthattheoptimaladsorbentandadsorptiontemperatureare5%[Bmim]Cl·CuCl2/silicageland20-50℃,respectively.H2Scanbecapturedandoxidizedtoelementalsulfur,and[Bmim]Cl·CuCl2/silicagelcanbereadilyregeneratedbyair.TheexcellentefficiencyofH2Sremovalmaybeattributedtotheformationofnano-scaledandhigh-concentration[Bmim]Cl·CuCl2confinedinsilicagel,indicatingthattheimmobilizationof[Bmim]Cl·CuCl2onthesol-gelderivedsilicacanbeusedforH2Sremovalpromisingly.
简介:国内车用替代燃料主要分为4类:生物质液体燃料(燃料乙醇、生物柴油)、电动力和氢能源、煤基液体燃料(煤制油、燃料甲醇)、车用燃气(CNG、LNG、LPG)。近年来,绿色低碳发展已经成为全球的共识,为配合国家空气治理工作,国内各大石油公司一方面加速提升油品质量,另一方面积极配合政府推广替代燃料,从而推动了国内车用替代燃料的快速发展。2018—2020年,生物质液体燃料政策性扩大封闭推广区域,不仅直接影响国内汽油市场,而且间接打击汽油调合市场,影响量超过2000万t/a;国内电动汽车爆发式增长、氢燃料电池汽车崭露头角,加速国内成品油需求见顶;低油价下煤制油项目坚持前行,五省一市甲醇汽车试点项目通过验收,甲醇汽车将正式走向市场;天然气汽车发展速度大不如前,规划目标恐难实现,有可能直接被逾越,LPG汽车逐步退出市场。全球群起宣布禁售燃油车,我国也已启动相关研究,将制定我国传统能源汽车退出时间表,远期汽车动力将会发生颠覆性的变化。
简介:近年来,随着人们环境保护意识的加强和环境保护法规的日益严苛,世界各国对可生物降解润滑油的研制与应用也更加重视。在设备润滑领域,传统润滑油主要关注的是润滑油能否减少机器零部件间的摩檫,从而达到节约能源和延长机器使用寿命的目的。对于可生物降解润滑油而言,除了与传统润滑油基本一致的润滑要求外,润滑油对环境,尤其是对土壌、水和空气的影响也非常重要[1]。齿轮传动是机械传动中的重要传动形式,齿轮的加工水平和承载能力已成为一个国家工业化水平的象征,齿轮的应用与齿轮油的润滑保护密不可分。随着材料科学的发展,齿轮箱体积不断变小,导致齿轮的工况更为苛刻,因此,S品质齿轮油的研制与应用势在必行。面对齿轮油品质不断升级的要求和严格的环保法规,可生物降解齿轮油的研究和发展越来越受到人们的重视[2,3]。