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1、物理化学学报(WuliHuaxueXuebao)MarchActaPhys.-Chim.Sin.2011,27(3),689-696689[Article]www.whxb.pku.edu.cn微孔/介孔复合分子筛的合成及其对CO2的吸附性能*马燕辉赵会玲唐圣杰胡军刘洪来(华东理工大学教育部先进材料及其制备重点实验室,化学系,上海200237)摘要:采用两步晶化法将合成的沸石前驱液(S)或沸石固体粉末(P)经不同浓度(c)的NaOH处理后,分别以表面活性剂十六烷基三甲基溴化铵(CTAB)软模板或介孔炭(Meso-C)硬模板为导向剂,自组装合成S-β-MCM41(c)、P
2、-β-MCM41(c)、P-ZSM-MCM41(c)、P-ZSM-C系列微孔/介孔复合分子筛.考察了沸石分子筛种类、碱处理液浓度以及介孔模板剂对合成复合分子筛结构与性能的影响.X射线衍射(XRD)、透射电子显微镜(TEM)和氮气吸附-脱附表征结果表明产物具有微孔/介孔多级孔结构.该材料对CO2的吸附能力比纯微孔或介孔材料均有明显提高,其中P-ZSM-MCM41(2)的CO-12吸附容量最大可达1.51mmol·g,为ZSM-5沸石吸附量的两倍多.关键词:微孔/介孔复合分子筛;二氧化碳吸附;双模板;两步晶化;碱浓度中图分类号:O647SynthesisofMicro/Me
3、soporousCompositesandTheirApplicationasCO2Adsorbents*MAYan-HuiZHAOHui-LingTANGSheng-JieHUJunLIUHong-Lai(LaboratoryforAdvancedMaterialsοfMinistryofEducation,DepartmentofChemistry,EastChinaUniversityofScienceandTechnology,Shanghai200237,P.R.China)Abstract:Wesynthesizedaseriesofmicro/mesopo
4、rouscompositesofS-β-MCM41(c),P-β-MCM41(c),P-ZSM-MCM41(c),P-ZSM-Cthroughatwo-stepcrystallizationprocess.Duringthisprocess,themicroporouszeoliteprecursorsolution(S)orthezeolitepowder(P)wasfirstsynthesizedandtreatedwithNaOHsolutionwithdifferentconcentration(c),andthenthemesoporeswereinduced
5、byhexadecyltrimethyl-ammoniumbromide(CTAB)asasofttemplateormesoporouscarbonasahardtemplate.Theeffectsofthetypeofinorganicprecursor,thebaseconcentration,andthetypeofmesoporoustemplateonthestructureandpropertyofthemicro/mesoporouscompositeswereinvestigated.TheresultsofX-raydiffraction(XRD)
6、,transmissionelectronmicroscopy(TEM),andnitrogenadsorption-desorptionisothermsshowedthattheproductscontainedmicroporesandmesopores,simultaneously.TheCO2adsorptioncapacitiesofthesemicro/mesoporouscompositeswereobviouslyimprovedcomparedtothepuremicroporousormesoporousmaterials.Amongthem,P-
7、ZSM-MCM41(2)hadthehighestCO2adsorptioncapacityof1.51mmol·g-1,whichwasalmosttwicethatoftheoriginalZSM-5.KeyWords:Micro/mesoporouscompositematerial;CO2adsorption;Dual-template;Two-stepcrystallization;BasicsolutionconcentrationReceived:September21,2010;Revised:December20,201
