简介：以工业水玻璃为硅源,表面活性剂十六烷基三甲基溴化铵为结构模板剂,利用室温晶化法合成出MCM-41介孔分子筛,并以钛酸丁酯为前驱体,通过溶胶凝胶法及液相沉积法对介孔分子筛MCM-41进行纳米TiO2的组装。运用XRD、FT-IR、N2吸附-脱附等表征手段对其结构特征和氧化钛分散状态进行了研究,结果表明：TiO2与MCM-41端基硅氧键反应形成Ti-O-Si键;纳米TiO2不仅进入孔道,较均匀地修饰了介孔分子筛MCM-41的孔壁,而且使介孔分子筛MCM-41仍保持有序的孔道结构。

简介：以水玻璃为硅源，在无压体系中合成含A1的硅基MCM-41，并采用XRD、TEM、27A1MASNMR及N2吸附一脱附等表征手段，系统研究A1的引入对MCM．41结构的影响。研究结果表明：A1原子对MCM-41骨架Si进行同晶取代后，A1以四配位骨架和六配位骨架外A1的形式存在，A1-MCM-41仍能保持长程有序的一维孔道结构。并且随着A1掺杂量的增加，孔径和孔体积减小，当Si／A1=25时比表面积达最高值。

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简介：Hyperbranchedpolyethylenimine（PEI）-functionalizedmesoporoussilica（MCM@PEI）wassynthesizedandusedtoproducepoly（vinylalcohol）（PVA）nanocomposites.Themodifiednanofillerwascharacterizedwithinfraredspectroscopy,thermogravimetricanalysis,X-raydiffraction,scanningelectronmicroscopy,transmissionelectronmicroscopy,andN2adsorption.Whencomparedwithpuremesoporoussilica（MCM）,theMCM@PEInanoparticlesexhibitedbetterdispersioninthePVAmatrix.TheeffectsofMCM@PEIonthethermalandflamepropertiesofPVAnanocompositeswerealsostudied.Improvementinthethermalpropertieswasconfirmedbyenhancedthermalstabilityandcharyield.IncorporationofMCM@PEIinPVAledtoasignificantdropintheheatreleaserateandthetotalheatrelease.

简介：在碱性条件下,以十六烷基三甲基溴化（CTAB）和正硅酸乙酯（TEOS）为主要原料,采用水热合成法制备出MCM-41分子筛.通过物理浸渍法对MCM-41分子筛进行表面功能化,制备出2-羰基丙酸邻羟基苯甲酰腙修饰MCM-41孔分子筛.研究了修饰分子筛对尾矿废水中镉离子的吸附性能,考察了吸附时间、pH值、温度、分子筛用量等因素对功能化分子筛吸附性能的影响.结果表明：2-羰基丙酸邻羟基苯甲酰腙修饰MCM-41分子筛在吸附时间为30min,pH为8.02,温度为40℃,吸附剂用量为0.08g的条件下吸附性能最佳,最大去除率为95.6%.

简介：Theepoxideisakindofversatileintermediateformanufactureofawidevarietyoffinechemicals.Thegoalofmodemefficientcatalyticmethodsistoproducedesiredcompoundswithhighyield,selectivity,lowcost,safety,operationalsimplicityandmoreimportantlyenvironmentallybenignmanner.However,therearevariousoxidants,whichareoftenhazardousorexpensive,beingusedforbothlaboratoryandindustrialepoxidation.Hydrogenperoxide(30wt%)solutionisthoughtasoneoftheidealoxidantsbecausewaterisasoletheoreticalsideproduct.Meanwhiletheepoxidationofstyreneisatypicaloneamongolefins.Here,theperformanceofstyreneepoxidationwasstudiedwithhydrogenperoxidesolutioncatalyzedbyCo(Ⅱ)phenanthrolinecomplexencapsulatedinsupercagesofMCM-41.

简介：Micro-mesoporouscompositemolecularsievesH-ZSM-5/MCM-41werepreparedbythehydrothermaltechniquewithalkali-treatedH-ZSM-5zeoliteasthesourceandcharacterizedbyscanningelectronmicroscopy,transmissionelectronmicroscopy,energydispersivespectroscopy,X-raydiffraction,N2adsorption-desorptionmeasurementandNH3temperature-programmeddesorption.ThecatalyticperformancesforthemethanoldehydrationtodimethyletheroverH-ZSM-5/MCM-41wereevaluated.Amongthesecatalysts,H-ZSM-5/MCM-41preparedwithNaOHdosage(nNa/nSi)varyingfrom0.4to0.47presentedexcellentcatalyticactivitywithmorethan80%methanolconversionand100%dimethyletherselectivityinawidetemperaturerangeof170—300℃,andH-ZSM-5/MCM-41preparedwithnNa/nSi=0.47showedconstantmethanolconversionofabout88.7%,100%dimethyletherselectivityandexcellentlifetimeat220℃.Theexcellentcatalyticperformanceswereduetothehighlyactiveanduniformacidicsitesandthehierarchicalporosityinthemicro-mesoporouscompositemolecularsieves.ThecatalyticmechanismofH-ZSM-5/MCM-41forthemethanoldehydrationtodimethyletherprocesswasalsodiscussed.

简介：Aseriesofamine-basedadsorbentsweresynthesizedusingsiliceousMCM-41individuallyimpregnatedwithfourdifferentamines(ethylenediamine(EDA),diethylenetriamine(DETA),tetraethylenepentamine(TEPA)andpentaethylenehexamine(PEHA))tostudytheeffectofaminechainlengthandloadingweightontheirCO2adsorptionperformancesindetail.TheadsorbentswerecharacterizedbyFT-IR,elementalanalysis,andthermo-gravimetricanalysistoconfirmtheirstructureproperties.Thermo-gravimetricanalysiswasalsousedtoevaluatetheCO2adsorptionperformanceofadsorbents.Longerchainamine-basedmaterialscanachievehigheramineloadingsandshowbetterthermalstability.TheCO2adsorptioncapacitiesatdifferenttemperaturesindicatethattheCO2adsorptionisthermodynamicallycontrolledoverEDAMCM41andDETA-MCM41,whiletheadsorptionoverTEPA-MCM41andPEHA-MCM41isunderkineticcontrolatlowtemperature.ThechainlengthofaminesaffectstheCO2adsorptionperformanceandtheadsorptionmechanismsignificantly.TheresultsalsoindicatethatCO2adsorptioncapacitycanbeenhanceddespiteofhighoperationtemperatures,ifappropriateamines(TEPAandPEHA)areapplied.However,adsorbentswithshortchainamineexhibithigheradsorptionanddesorptionratesduetothecollaborativeeffectofrapidreactionmechanismsofprimaryaminesandlessdiffusionresistanceofshorterchainlengthamines.

简介：Phasebehaviorofbinarysystemofbromobenzene-chlorobenzene(C6H_5Br-C_6H_5Cl)confinedinSBA-15andMCM-41(porediameter8nm,3.8nm,respectively)hasbeeninvestigatedbymeansofdifferentialscanningcalorimetry(DSC).PhasediagramofC_6H_5Br-C_6H_5ClsystemconfinedinSBA-15isatypeofthecompletemisciblebothinliquidandsolidstate,thesamephasebehaviorasthebulksystem.However,thephasediagramcomprisesonlyoneboundaryline,whichisshifteddown22-36Kwithrespecttothebulksystem.C_6H_5Br,C_6H_5ClorthemixturewithinnanoporesofMCM-41isnonfreezing.ThedifferentphasebehaviorofthesystemconfinedinSBA-15andMCM-41isthoughtmainlyduetotherelativesizeofporetomolecule.

简介：<正>ZSM-5/MCM-41compositemolecularsievewaspreparedbythenano-assemblingmethod.TheZSM-5molecularsieve,theMCM-41molecularsieve,theZSM-5/MCM-41mechanicalmixtureandtheZSM-5/MCM-41compositemolecularsievewerecharacterizedbyX-raypowderdiffractometry,N2adsorptionisotherms,temperatureprogrammeddesorptionofammoniaandscanningelectronmicroscopyandtheirpropertieswereanalyzed.UsingFCCgasolineasthefeed,activitiesofdifferentmolecularsievesforreducingolefincontentwereinvestigatedinacontinuoushigh-pressuremicro-reactorunitunderthefollowingconditions:areactiontemperatureof400℃,areactiontimeof2h,aweighthourlyspacevelocityof3h-1,andareactionpressureof2.0MPa.TheresultsshowedthattheHMCM-41molecularsievehadlowreactionperformance,andtheHZSM-5molecularsievedemonstratedhigharomatizationactivity,whiletheZSM-5/MCM-41compositemolecularsieveexhibitedabestolefin-reducingperformancebecauseofitshighisomerizationactivityandmoderatearomatizationactivity.Withalargestolefin-reducmgcapabilityandareasonabledistributionofproducts,thecompositemolecularsievewasmoresuitableforFCCgasolineupgradingcomparedtootherthreecatalysts.

简介：有spheres-within-a-sphere的合并Cu的订的六角形的mesoporous硅酸盐(Cu-MCM-41)凹陷结构作为合作模板用thermoreversible聚合物hydrogelmethylcellulose(MC)和cationic表面活化剂被综合了，它被扫描电子显微图(SEM)描绘了，X光检查衍射(XRD)，传播电子显微图(TEM)，并且N2吸附解吸附作用等温线。获得的结果显示合并Cu的MCM-41材料的形态学是“spheres-within-a-sphere”空组织，它很类似于的蜂窝状。在有H2O2的苯hydroxylation，空范围比Cu-MCM-41的粒子显示出许多更高催化的活动。

简介：ActiveFe-andMn-loadedMCM-41(Fe–Mn/MCM-41),whichwassynthesizedviaahydrothermalreactionfollowedbyimpregnation,isusedintheheterogeneousFentonreactiontodegrademethylorange(MO)inaqueoussolution.ThesynthesizedsampleswerecharacterizedbyX-raydiffraction,scanningelectronmicroscopy,transmissionelectronmicroscopy,N2adsorption–desorptionisothermanalysis,Fouriertransforminfraredspectroscopy,andX-rayphotoelectronspectroscopy.ComparedwithFe/MCM-41andMn/MCM-41,Fe–Mn/MCM-41showedhigheractivityforMOdegradationandmineralization.Effectsofvariousoperatingparameters,suchaspH,Mncontent,andH2O2dosage,onthedegradationprocessweresubsequentlyinvestigated.ResultsofexperimentsontheeffectofradicalscavengersrevealedthatthedegradationofMOcouldbeattributedtooxidationbyHO·.ThesynergyofFeandMnspeciesintheFentonoxidationprocesswasalsoexplained.

简介：首次在温和条件下，用在传统微孔沸石合成中常作为导向剂的乙二胺或1，6-己二胺替代NaOH作催化剂合成出SiO2基中孔MCM-41分子筛。合成样品用XRD和N2吸附等温线进行表征。实验结果表明，由于这种替代，使相应合成样品及焙烧样品的中孔骨架结构的有序度明显提高。在XRD图中四个衍射峰清晰可辨，是典型的六方紧密堆积，晶胞参数a0分别为4.11nm和3.75nm，且d100值随所用胺分子中碳链的增长逐渐从3．56nm减少到3．24nm，同时产物孔径由中孔转变为微孔。更多还原

简介：合成了外围具有柔性链状基团的2（3），9（10），16（17），23（24）-四-（N，N-二乙胺基乙氧基）Ni-酞菁配合物（2）．以正硅酸乙酯为硅源，十六烷基三甲基溴化铵为模板剂，水热法将该Ni-酞菁配合物（2）装载到MCM-41中．利用UV-Vis-NIR，FT-IR，XRD，TEM，FESEM及N2吸附-脱附等温线对制备的样品进行了表征．研究表明制备的样品中Ni-酞菁配合物（2）主要以单体和二聚体的形式存在于MCM-41中．通过不同制备酞菁浓度的装载研究表明，较高制备酞菁浓度有利于制备结晶度及孔道有序性较高的介孔分子筛样品．

简介：以正硅酸乙脂（TEOS）为硅源，十六烷基三甲基溴化铵（CTAB）为表面活性剂，添加聚乙二醇（PEG）和聚乙烯吡咯烷酮（PVP）为分散剂，合成了A1MCM-41纳米硅铝介孔分子筛，运用XRD、N2吸脱附、TEM对所得样品进行表征，结果表明，添7DPEG和PVP均能显著改善A1M—CM-41纳米硅铝介孔分子筛的分散性，但是PVP的分散效果明显好于PEG，这是因为，PVP链上吡咯基中电负性的氧原子与分子筛颗粒表面的羟基形成氢键，更易吸附在颗粒的表面，提高颗粒的分散性。

简介：以肠溶性的羟丙基甲基纤维素邻苯二甲酸酯(HPMCP)作为包覆材料，制备了HPMCP包覆的MCM—48介孔分子筛药物控释载体(HPMCP／MCM—48)，并考察了抗癌药物6-巯基嘌呤（6—MP）负载于控释载体后，在不同pH释放环境中的释放行为。结果表明，在模拟胃液中(pH-1.2)，HPMCP能明显地延缓6—MP的释放速度;药物释放4h后，其释放率仅为14%，而在模拟肠液中(pH-7.5)HPMCP迅速溶解，对6-MP释放速度的影响甚微；药物释放4h后，释放率可达到79%，与此同时，包覆膜的提拉速度影响6—MP的释放行为，提拉速度在1.00~3.00mm/s范围内，提拉速度越快，药物在模拟胃液中的释放速度越快。

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简介：摘要： 本论文制备铁-镍-氧化石墨烯复合材料和MCM-48介孔分子筛材料，利用两种材料对阳离子染料进行脱色研究，讨论两种材料之间的用量配比、温度、酸碱度对染料处理效果的作用。通过对各材料吸附前后的TEM和XRD表征，分析研究材料的结构、吸附效果和效率。结果证明，用量配比达到MCM介孔分子筛: 铁-镍双金属复合材料=1:0.8时吸附效果最好，而当温度达到50℃，pH=3时，吸附效率最高。

简介：介孔材料具有比表面积高、结构可调、水热稳定性好和独特的吸附性能,在烟草行业具有较好的应用前景。总结了介孔材料的分类、合成以及在卷烟中选择性吸附特定物质的应用及相应的吸附机理,展望了介孔材料目前在卷烟中应用的研究方向。

简介：目前，塑料产品的大规模使用，导致了大量废塑料的产生。国内外许多学者对其回收利用技术进行了深人研究，其中废塑料催化裂解制燃料油技术作为一种较好的回收方法，具有广阔的发展前景。