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:针对燃煤烟气SO2脱除技术面临的可持续发展困境,以固体碳材料为还原剂的碳热SO2还原制硫磺技术具有重要发展前景,其中抑制非目标副产物的伴生是实现SO2定向还原的关键。基于吉布斯自由能最小原理对碳热还原SO2反应进行平衡产物量的计算,并通过固定床-FTIR实验分析反应的气相产物,探究了硫产率、副产物CO、COS和CS2的生成规律。基于温度对反应热力学平衡的影响,结合副反应,来推断出合理的反应机理。在摩尔比n(C)∶n(SO2)≤1.0时体系中主要发生反应C+SO2→S+CO2,副产物CS2生成量级仅为10-4,理论硫产率可维持在0.9以上。过量的碳会促进COS由主反应物一步生成,高温、碳过量会促进COS向CS2的转化反应。相关研究结果对实际应用时最佳工况的选取以及单质硫选择性的提高具有重要指导意义。
简介:直接选择桌面组合,免去搭配和多个设备连接的麻烦。而很多Hi-Fi音响厂商都有推出这一类集解码播放喇叭于一身的组合音响,它们有些只包含一台单独的设备。
简介:通过三步合成(E)-二(对3-硝基苯甲酸)乙烯(C16H10N2O8)配体,并由此通过溶剂热法合成金属有机框架材料Zn2(EBNB)2(BPY)2·2H2O;采用x射线单晶衍射分析、红外光谱(IR)和热重分析(TG)等对所得结构进行表征,并测试其荧光性能;以洛贝林为模型药物,研究了Zn2(EBNB)2(BPY)2·2H2O对该药物的载药及体外释药性能。研究结果说明,Zn2(EBNB)2(BPY)2·2H2O对洛贝林的最高载入量达0.355g/g,载药体系的体外释药为明显的两相模式。体外细胞毒性实验结果表明,Zn2(EBNB)2(BPY)2·2H2O具有良好的生物相容性。
简介:andthereductionofpublicandsocialexpenses.Economistsmaynotnecessarilysharetheeconomicandsocialinterestsofthetruebelieversandmayhaveavarietyofindividualpsychicstatesregardingtheeconomicandsocialeffectsoftheutopiawhichtheycloakwithmathematicalreason.Nevertheless,orbetteryetthesupranationalstate-aEuropeanstateonthewaytowardaworldstate-capableofeffectivelycontrollingandtaxingtheprofitsearnedinthefinancialmarketsand,onreservesofsocialcapitalthatprotectanentireportionofthepresentsocialorderfromfallingintoanomie.Thissocialcapitalisfatedtowitheraway-althoughnotintheshortrun-ifitisnotrenewedandreproduced.Butthesesameforcesof"conservation"
简介:Therearepowerfulpoliticalobstaclesbetweenpeople.Themainobstaclescomefromthesocialdemocraticmovement.IfwesucceedinovercomingtheseitwillleadtoagenuineThirdWaywhichwillbemuchmoreradical.Weneedtobuildtheleftoftheleft.Intheecologymovementyouhavepeoplewhoarereallyontheleft--evenamongtheCommunistParty,InFrancewehavethistraditionofworkerismwhichisanti-intellectual.Theunionsareveryhostiletointellectualsandtheintellectualsareverydistantfromworkers.In1968itwasveryvisible.NowforthefirsttimebecauseofthefailureofSovietMarxismwearefreefromthat.SoIcanspeakwithaCGTofficialasIamspeakingtoyou.Theyareveryopen.Inasenseintellectualslikemedidnotexist20yearsago.PeoplelikeSartreandFoucaultweresympathetictothemovement,Forcesotherthantheleftaretryingtogainahearing.SoweseetheHaiderphenomenoninAustria.Buthehasnotgoneunchallenged.TherecreationofatrueleftwingmovementwillbethemaininstrumentofthedestructionofHaider.NobodyspokeaboutLePenandtheNationalFrontinFranceduringthehotwinterof1995inFrance.ThemassmovementindefenceofpensionsinItalyalsomarginalisedthefarright.
简介:通过涂覆热分解法制备了Ti/RuO2-ZrO2-SnO2、Ti/RuO2电极材料,采用X射线衍射(XRD)、扫描电镜(SEM)和循环伏安(CV)对电极材料进行表征,考察了电流密度、NaCl质量浓度、pH值及电极间距对废水COD降解率的影响。结果表明,Ti/RuO2-ZrO2-SnO2电极对COD具有更高的降解率,对其进行工艺优化。电极材料对废水降解的最佳工艺条件为电流密度40mA/cm^2,NaCl质量浓度4g/L,pH=5.0,电极间距10mm,COD的降解率达到90.5%。Ti/RuO2-ZrO2-SnO2电极中SnO2与RuO2生成固溶体,有利于增强涂层与基体之间的结合力,提高电极的稳定性;ZrO2起到细化晶粒的作用,致使电极表面粗糙度增加,增强了电极的电催化性能,且降解过程符合一级动力学模型。
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.