负载型金属复合半导体制备及光催化CO2和甲醇反应性能

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1、确⑧天洋大尊十目《R第一*★学博士学位论文一■啊●_●■■0'订j：●¨■■¨0■■■■_一级学科：丝兰王握刍撞查学科专业：王些摧也作看姓名：丑全面指导教师：垃陋塑塑撞天津大学研究生院2005年12月AbstractDirectsynthesisofdimcthylcarbonate(DMC)fromC02andmethanolhas删significanceinsyntheticchem．,utilizationofcarbonreco峨andenvironmcmalprotection．Inthisthesis,wecxlencledthisstudyIothe

2、gas-solid托acdonsystembyusingpholoca士aaytic托actiontechnology,theSul'fagcstnKt瞰e，lightabsorptionability,chcmisorptionsandphotocatalyticactivityofthesupportedcoupledscmiconductorswithmetalmodifiedwmsystemicallyinvestigatedbyXRD，BET,TEM,TPRRa：man,ⅡIUv．ⅥSDRSandTPD-MStechniques．LThesupported

3、mctal-couplcdsemiconductorscI】／NiO-V20s／Si02,Cu／NiO-MoOJSiOzandCu／NiO-'li02／Si02werepreparedusingmulti-stapimpregnation-reductionmethod,onthesurfaceofthesematerials,V205，M003andTi02notonlyactedOnthesurfaceofsupportSi02by@Mo,zi)-o—Sibonds，butalsocoupledwithNiOthroughⅣMo．Ti)-O-Nibondresp

4、ectively．AndmetalsiteCu,LewisacidsitesfV％rM06+or矿andNi飞Lewisbasesiter《(v=oorMo=o)and@Mo,"n)-o-Ni)afepresentedonthesurfaceofsupportedcoupledsemiconductorswithmetalmodified．ComparedwiththecorresponcUngbulksemiconductorsandsupported咖glesemiconductors，thesupportedcoupledsemiconductorsNiO-V

5、205／Si02，NiO-M003／Si02andNiO-TiOgSi02havelargerforbiddenenergygapkandtherecombinationactionbetweenprimitivecomponentsincreasesthelightabsorptionability,theadditionofCuapparentlyellhanecesthevisiblelightabsorptionability,2C02chemisorbsOnthesurfaceofCu／NiON如娲i02。Cu怒醯O-M003／Si02andCu／NiO—

6、Ti02／Si02asbidentateormonodantalecarbonatestate，lineaxsta镌sheal-ingstateandhighactivehorizontalstateCu-(CO)-O—VS+(orMo％哟，CH30HcanchemisorbonthesurfaceofthesematerialsasmolecularadsorptionstateanddissociativeadsorptionsI撒andtheamountofmolecularadsorptionstateapparentlydecreaseswiththeab

7、sorptionintensityincreasingaftertheadditionofrectalCu．3．Thephotocatalysis1-1洲onresultsindicatethat,the口lotoc籼sisreactiongreatlyadvancestheconversionofreactants．andnlakesthereactiongoalongvisiblyeven砒lowtemperature．Thephotocatalysisactivitiesofthesupportedcoupledsemiconductorswithmeta