多孔四价金属氧化物纳米材料的通用制备和结构分析

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1、ABSTRACTfotmdthatNaBI-hnotonlyactsasaprecipitatingagent，butalsoprdvidesacontinuousdisturbanceoftheenvironmentforthisreaction．HighsurfaceenergyofinitiallyformedZr02nucleiandkineticdisturbancegeneratedfromtheHEbubblesarebelievedtobethedrivingforcesforthegrowthandassemblyofZr02particle

2、sanddirectlyaffectsthemorphology,thecrystallinephaseandtextureperformanceofZr02．Inotherwords，whenthecolloidmillslitwidthandspeedisconstant，themorphology,crystalphaseandtexturepropertiesofZr02CanbecontrolledbytheconcentrationofNaBH4．However,ourpurposeistof'mdanewfacilescale·-upmethod

3、forthesynthesisofMicro／meso·-porousmorphology—controlledtetravalentmetaloxidenanomaterials．Inthebasisoffeasibility,weneedtoprovetheuniversality．Afterthat，wetakeadvantageofthisnewmethodtosynthesizeCe02(291．2m291specificsurfacearea)andTi02(186．1m291specificsurfacearea)successfully，ofw

4、hichspecificsurfaceareaalemuchhigherthantheconventionalmethodpreparation．Althoughothertetravalentmetaloxidepreparationsaleongoing，theuniversalityofthisapproachhasbeenpreliminarilyverified．2．Thismethodisnotonlysuitableforpreparationofsinglemetaloxide，butalsoforpreparationofmultipleme

5、talandmetaloxide．ThenewZr02-Ni(OH)2compositeoxidewithhighspecificsurfaceareaof263．5m2g-1WassynthesizedbyhydrothermalmethodofdynamicIU北京化工大学硕士学位论文controlled．AndwepreparedtheAu／Zr02一Ni(OH)2catalystbyNaBI-14directreductionmethodanditwasappliedtothecatalyticoxidationofbenzylalcoh01．Thec

6、atalyticactivitywassignificantlyhigherthanthatofAu／Zr02．ThroughtheanalysisofTPDandXPSspectra,synergisticeffectWasfoundbetweenthedopedNi(OH)2andZr02whichenhancedthebasicsitesonthecatalystsurface．Thestrongerbasicsites，themorefavorableoxidationofbenzaldehyde，andthusimprovingcatalyticac

7、tivity．KEYWORDS：tetravalentmetaloxides，nucleationandcrystallizationseparationmethod，kineticallycontrolled，compositeoxidesupport，theoxidationofbenzylalcohol目录第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1纳米材料⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1．1纳米材料的概念⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．1．2纳米材料的应用前景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

8、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一21．2多孔材料