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1.
Concentratedhomogeneousmineralacidshavebeenwidelyusedascatalystsinindustrialprocessesforseveraldecades.Thesecatalystsarecorrosivetotheapparatus,andtherearelargevolumesofchemi callyreactivewastestreamthataredifficulttodealwith[1 ] .Inordertosolvetheseprob…  相似文献   

2.
Selectiveoxidationofalcoholshasbeenwidelystud iedduetoitsimportanceinmanyorganicsyntheses .1 7Howtomakemoreeffective ,cheap ,easilyaccessibleandenvironmentallybenigncatalystsismatterofwideinter est .Itiswellknownthatspinel type (AB2 O4 )ofcom plexoxidescanbeapp…  相似文献   

3.
EfectofSteamontheOxidativeCouplingofMethaneoverLa┐BaSystemCatalysts**SupportedbytheNationalNaturalScienceFoundationofChina.**...  相似文献   

4.
HydrofiningcatalystscontainMn Ni,Ni Mo ,Ni W ,Co Mo ,Mo ,W ,Ni,Co ,etcandmanystudiesofthesecatalystsareconcernedwiththead ditionofphosphorusorcompoundscontainingphos phorustogiveNi Mo P ,W Ni P ,Mo P ,Ni P ,W P ,Co Mo P ,NiPS3,andMo Ni W P[1 ,2 ] .Theef fectofaddingphosphorusor…  相似文献   

5.
Homogeneouscatalysisoffersmanyadvantagesoverheterogenouscatalysiswithrespecttoactivity ,selectivi ty ,flexibilityofoperation .However ,thecontinuouscat alystconsumption ,catalystremovalfromtheproductsandcatalystdisposalhavestilltobeimproved .Anat tractiveap…  相似文献   

6.
IntroductionBecausethepolynuclearcomplexes ,consistingofaromaticmulti carboxylicacidandtransitionmetal,haveavarietyofpossibleapplicationsrangingfromfineretar dantstocatalysts ,andpotentiallyvaluablepropertiesreminiscentofzeolites ,thestudyonthemhasbeenan…  相似文献   

7.
还原热解催化合成金刚石新法   总被引:2,自引:0,他引:2  
麦松威 《化学进展》1998,10(4):460-460
SyntheticDiamondfromaNovelReduction┐Pyrolysis┐CatalystRoute1.论文名称AReduction-Pyrolysis-CatalystSynthesisofDiamond2.发表刊物Science...  相似文献   

8.
TheReactionsBetweenHalidesandAlcoholsinthePresenceofPhaseTransferCatalystsWithoutAnyBaseJIANGYu-lin;YUANYun-cheng;andWUBao-qi...  相似文献   

9.
StudyofCatalystsBasedonHighSurfaceAreaMnO2forCatalyticCombustionofCH4WANGXiangXIEYouchang1)(DepartmentofChemistryPekingUniver...  相似文献   

10.
IntroductionMaterialsbasedoncobaltoxideshaveattractedagreatinterestinviewoftheirpotentialapplicationsinscientificandtechnologicalfields .1Theyhavebeenusedfortheproductionofsolid statesensors ,2 heterogeneouscatalysts ,3electrochromicdevices (ECDs) 4andasinte…  相似文献   

11.
Ferricoxide(αFe2O3),chromicoxide(αCr2O3)andtheirmixedcompoundshaveimportantapplicationinmanyfields.Forinstance,theycanbeusedascatalystsforhightemperaturewatergasshiftreaction[1]andreductionofNOxbyNH3[2],asrefractorymaterials[3]andsensingmaterials[4,5],andsoon.Sinc…  相似文献   

12.
Incomparisonwiththealuminumanalogues,boroncontainingMFItypezeolitehasbeenexpectedtohavemilderacidicpropertiesandspecificcatalyticperformance.Uptonow,muchworkhasbeendoneinthisaspect[1—5],includingsynthesis,structuralcharacterizationandcatalysis,etc.Therear…  相似文献   

13.
IntroductionSchiffbase-transitionmetalcomplexescanbeusedashomogeneouscatalystsinasymmetricorganicsynthesis,suchasthesynthesisofchiralα-cyanohydrin,cyclopropaneorepoxidescompounds[1—3],furthermore,ithasbeenfoundthatthesecomplexeswerefoundtobeassociate…  相似文献   

14.
Theinterfacebetweenhomogeneouscatalysisandheterogeneouscatalysishasgreatscopeforthedevelopmentofnewcatalyticmaterials[1~ 4] .Sup portedaqueous phase (SAP)catalysishasbeenem ployedforthehydroformylationofolefinsundermildconditionswithhighefficiencyandconven…  相似文献   

15.
1 INTRODUCTIONInthedevelopmentoftransitionmetalclusters,agreatmanytetrahedron-typechiralclustershavebeensynthesized.Oneimportantreasonisthatsuchclusterscanbepotentiallyusedasasymmetriccatalystsintheprocesswhichistrulycluster-cat-alyzed〔1,2〕.However,t…  相似文献   

16.
邓国军  范青华  陈晓闽 《中国化学》2002,20(11):1139-1141
Dendrimersarehighlybranchedmacromoleculesthathavepreciselydefinedmolecularstructureswithnano scalesize .SincethepioneeringworkofvanKotenetal.reportedin 1994 ,1dendriticcatalystshavebecomeasub jectofintensiveresearch .2 ,3 Althoughanumberofden driticcatalystsha…  相似文献   

17.
IntroductionDinuclearcomplexesofsilver(I)havebeenexten sivelystudied ,1owingtotheirimportanceascatalystsandtransferreagents.2 AromaticN heterocycleshavebeenprovedtobesuitableligandsincoordinationchemistry .3Thetriazolederivatives ,forinstance ,havebeenwidely…  相似文献   

18.
TheactivityofFe(naph)2Al(iBu)3CH2CHCH2Clcatalystishighinbutadienepolymerizationwithhydrogenatedgasolineassolvent[1].Thekineticsofthecatalysthasbeenstudiedasahomogeneouscatalyticsystem[2].However,thepreparativemethodsofthecatalystincludingratioandaddingordero…  相似文献   

19.
1 INTRODUCTIONCyclenderivativescontainingfourneutralpendentgroupsareeffectiveligandsforlanthanideandtransitionmetalions〔1~4〕.TheycanbeusedascatalystsforRNAtransesterification〔5〕orforcleavageofphosphateesters〔6〕orphosphoricanhydride〔7〕.Someofthemhaveb…  相似文献   

20.
Squareplanarcisdicarbonylrhodiumcomplex,aprecursorofcatalyticallyactivecompoundincatalyticreaction,isatypicalkindofcatalyst[1].Itisusuallyunstable.Forexample,withoutefficientprotectionofCOandhightemperature,diiododicarbonylrhodium,aneffectivecatalystforth…  相似文献   

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