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1、物理化学学报(WuliHuaxueXuebao)JanuaryActaPhys.-Chim.Sin.2014,30(1),129-134129[Article]doi:10.3866/PKU.WHXB201311201www.whxb.pku.edu.cn金属有机骨架材料MIL-53(Al)负载纳米Pd颗粒:一种CO氧化的活性催化剂**梁倩赵震刘坚韦岳长姜桂元段爱军(中国石油大学(北京)重质油国家重点实验室,北京102249)摘要:通过等体积浸渍法制备了金属有机骨架材料MIL-53(Al)(MIL:MaterialsofInstitutLavoisier)负载纳米
2、Pd催化剂.采用X射线衍射(XRD)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)等手段对催化剂的结构进行了表征.催化剂在反应前后XRD衍射峰保持不变,说明载体MIL-53(Al)具有良好的稳定性.采用TEM对催化剂进行表征,结果表明,MIL-53(Al)的多孔晶体结构有助于形成高度分散的纳米Pd颗粒,样品2.7%(w)Pd/MIL-53中Pd颗粒的平均粒径为2.21nm.该催化剂在CO氧化反应中表现出较高的催化活性,115°C达到完全转化.同时催化剂可循环使用,多次反应后催化活性和催化剂结构都保持稳定.关键词:金属有机骨架材料;MIL-53(Al);纳米
3、Pd颗粒;多相催化;CO氧化中图分类号:O643PdNanoparticlesDepositedonMetal-OrganicFrameworkofMIL-53(Al):anActiveCatalystforCOOxidation**LIANGQianZHAOZhenLIUJianWEIYue-ChangJIANGGui-YuanDUANAi-Jun(StateKeyLaboratoryofHeavyOilProcessing,ChinaUniversityofPetroleum,Beijing102249,P.R.China)Abstract:Pdnanopar
4、ticles(NPs)supportedonametal-organicframework(MOF),MIL-53(Al)(MIL:Ma-terialsofInstitutLavoisier),werepreparedusingtheincipientwetnessimpregnationmethod.Thestruc-turesofthesynthesizedPd/MIL-53(Al)catalystsweredeterminedusingX-raydiffraction(XRD),transmis-sionelectronmicroscopy(TEM),and
5、X-rayphotoelectronspectroscopy(XPS).Thesamepeakswereob-servedintheXRDpatternsofPd/MIL-53(Al)beforeandafterthecatalyticreaction,confirmingthatthein-tegrityoftheMIL-53(Al)supportwasmaintained.TheTEMresultsindicatedthatthecrystallineporousstructureofMIL-53(Al)favoredtheformationofhighlyd
6、ispersedPdNPsofaveragesize2.21nm.Thehet-erogeneouscatalyticcompositematerialsexhibitedhighactivitiesforCOoxidation,withfullconversionat115°C.ThecatalyticactivityandstructureofPd/MIL-53(Al)werestableafterseveralreactionruns.KeyWords:Metal-organicframework;MIL-53(Al);Palladiumnanopartic
7、le;Heterogeneouscatalysis;COoxidation1Introductionheterogeneouscatalysis.1-3Noblemetalnanoparticles(NPs)COoxidationhasgeneratedconsiderableinterest,notonlydispersedonasolidsupportcouldbeactivecatalystsforCOoxidation.4,5Itiswellknownthatthesemetalparticlestrendtobecauseofitsimportancei
8、nterm
