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1.
CeO2 ormaterialscontainingCeO2 possessuniqueredoxpropertiesincatalyticprocesses[1~ 3] ,andcanimprovedispersionofactivecomponentsonthesup portsandthusenhancetheirthermalstabilityandcatalyticactivity .MoststudieshaveusedCeO2 asanadditive[4 ] andexamineditsintera… 相似文献
2.
Perovskite typeoxides (generalformulaABO3 )havebeenattractingmuchattentionformorethantwodecadesduetotheirpotentialcommercialapplicationsascatalystsforvariousreactions :oxidationofCO[1~ 3 ] andlighthy drocarbons[4~ 7] ,combustionofnaturalgasorCH4 [8~ 1 1 ] (tocontrolN… 相似文献
3.
Adsorption of Er( Ⅲ ) and Its Mechanism on Diglycolamidic Acid Resin 总被引:15,自引:0,他引:15
Thesynthesischaracterizationandadsorp tionpropertyofpolymericmaterialshavebeenpublishedinrecentyears[1~ 9] .DiglycolamidicacidresinDAARisanovelpolymericmaterialwhichcontainsafunctionalgroup [-N(CH2 COOH ) 2 ].Itpossessesnotonlyprotonthatcanexchangewithcation ,b… 相似文献
4.
Crystalengineeringofcoordinationpoly merswithopenframeworksassembledfromor ganic metalcompoundshasbeenofgreatinter estsowingtotheirpotentialpropertiesasnovelmaterialssuchasgasadsorption[1,2 ] ,ion ex change[3] andcatalysis[4] .Theconstructionofcoordinationpolym… 相似文献
5.
YBa2 Cu3O7,so called 12 3compound ,isanim portanthighTc oxidesuperconductor[1] .Itscrystalstructureisquasiperovskite (Fig .1)witharegularstackingofBaandYlayersinthec direction .Itisorthorhombic ,belongingtothePmmmspacegroupwithoneformulaunitperprimitivecell .Theyttr… 相似文献
6.
Ithasbeenmorethan 2 0yearssincerareearths (RE)areappliedinagriculture .Duringlastyears ,theaccumulationofREinsoilswasacceleratedbecauseRE NH4HCO3 complexfertilizerswereextensivelyappliedanddirectlyusedinsoils[1] ,sothereisagrowingconcernabouttheadverseeffectof… 相似文献
7.
Effects of La, Ce, Y and Tb ions on Free Radical Mediated Peroxidation of Human Erythrocyte Membrane
Basedonthehepaticcontentsoflipidper oxidesafter 0 0 5mg·kg-1bodyweight(bw)ofSmCl3andPrCl3weregivenbyp .o ,i .pandi.vinjectiontotheratsdailyfor 1 2d ,Nieetal[1] foundthattheybothinhibitedthelipidperoxidationandelevatedtheSODactivity .However,ahigherdose (2 8mmol·kg-1)ofL… 相似文献
8.
王龙妹 《中国稀土学报(英文版)》2001,(4)
ItisnowwellestablishedthatnumerousfactorsinfluencethereactionpathwaysinsuchacomplicatedY Ba Cu Osystem ,forin stance ,thecrystallinesizesandthereagent[1] ,thedegreeofmixingandhomo geneity[2 ,3] ,theoxygenpartialpressure[4~ 6 ] ,aswellasthereactorsizeandcrucibleshap… 相似文献
9.
Thepoormechanicalpropertiesofcastmaterials ,especiallylowtoughness ,isamainfactorlimitingtheapplicationofprecisecastdies[1] .ThroughthemodificationofcastH1 3steelbyRE ,thedendritesegregationofCH1 3steelwasimprovedandgrainboundarycarbidewasalsoundercontrol.Acc… 相似文献
10.
Becauseoftheirpossiblerelevancetomodelcompoundsofcationtransportacrossmembranes,differenttypesofopenchain“crown”ethermoleculeshavebeensynthesizedinordertostudytheirinteractionwithsodium ,potassiumandrareearthions[1,2 ] .Panetal.[3 ] showedthatCe3 formsa 1∶1com… 相似文献
11.
Sokolov V V Osadchaya L I Galkin P S Zelenin Ju M Stonoga Ju A Zubareva A P 《中国稀土学报(英文版)》2002,20(4):256-258
IntermetallicLnNi5 compoundswithCaCu5 structuraltypeinthetransitionmetalsublatticesubstitutedbyMn ,Al ,Co ,Sn ,GearepromisingmaterialsforM -Hbatteries[1] .Usuallythesecompositionshavebeenpreparedbymeltingofthepureelementsfollowedbyap propriateannealingandthenb… 相似文献
12.
Synthesis and Crystal Structure of Bis (tert-butyl-cyclopentadienyl) Erbium Ethoxide, (t-BuCp)2ErOEt 总被引:1,自引:1,他引:0
Mostoforganolanthocenecomplexescon tainingLn Cσ bondhaveproventobehighlyefficientcatalystsorprecatalysts ,suchasforC-Hbondactivationreaction[1] ,hydrogenationreaction[2 ] ,andhomogenouspolymeriza tion[3] .However ,amongthisfamilyofcom plexes ,σ bondedorganolanthoc… 相似文献
13.
Spectrophotometricmethodsarewidelyusedforthedeterminationofrareearthele ments,andmono and 2 ,7 bisazo derivativesofchromotropicacidarebeingextensivelyem ployed[1~ 2 ] .Thoughmorethanahundredreagentsbasedonasymmetricalphosphonebi aszoderivativesofchromotropicac… 相似文献
14.
Synthesis and Structural Characterization of a Novel Two-Dimensional Heterometallic Coordination Polymer Nd_2Zn_3(EDTA)_3(H_2O)_( 11)·12H_2O 总被引:1,自引:0,他引:1
Themagneticpropertiesofheteropolynu clearcomplexescontainingboth 4fand 3dionshaveattractedconsiderableinterestssince1 985 [1] .Carboxylicacidisakindofpotentialligandforthedesignandsynthesisofthiskindofmagneticmolecularmaterials .Somecar boxylatecompoundswerep… 相似文献
15.
Anumberoflanthanideternarycomplexescon tainingheterocyclicamineshavebeenreportedsince1960 [1] .Inrecentyearsmuchattentionhasbeenpaidtoquaternarycomplexesoflanthanidesbecauseofin terestingstructure ,coordinationmode ,competitionre actionandproperty[2~ 9] .ESRcane… 相似文献
16.
Synthesis, Characterization and Vulcanizing Properties of Rare Earth Complexes with 2-Mercaptobenthiazole 总被引:9,自引:1,他引:8
2 mercaptobenzothiazolewasfirstreportedbyHofmann[1 ] in 1 887.Ithasbeenusedasanacceleratorinthevulcanizationofrubberformanyyears .Todayitisstillbeingusedasamainacidicacceleratorinrubberindustry .Butithasdisadvantagesofvulcanizationreversionandeasyscorch[2 ] whe… 相似文献
17.
Therearealotsofreportsaboutthepoly merizationofacrylonitrile (AN) [1~ 3] .Intheradicalpolymerization ,usuallyitisinitiatedbybenzoperoxide ,K2 S2 O4 Na2 S2 O3,Fe2 + H2 O2 andsomeorganiccompounds .There portsonorganolanthanidesassingle componentcatalystswasrarelyinlitera… 相似文献
18.
Effect of Rare Earths on Composition and Activities of Rare Earth Elements Binding Glycoprotein in Tea 总被引:4,自引:0,他引:4
Teapolysacchridecomplex ,oneofthebasicmacromoleculesintea ,hasmanyphar maceuticaleffectsandiseasytodissolveinteainfusion[1] .Zhongetal .[2 ] discoveredthatthereisaREbindingpolysaccharideinleavesofteaplant (CamelliaSinensisLO .Kuntze) .Inthispaper ,thestudyontheco… 相似文献
19.
Thepervoskite typeLaCrO3materialhasbeenextensivelyinvestigatedforitsapplica tion ,suchasanelectrodematerial,electro catalysisandgassensor[1~ 3] .Chemicalcom positionandphasepurityaretwoparameterswhichoftenaredifficulttobecontrolledinmulticomponentmetaloxide… 相似文献
20.
Development of Modified 304 Stainless Steel Resistant to Stress Corrosion Cracking in Chloride Environment 总被引:1,自引:0,他引:1
Stainlesssteelsare practicallyusedinneutralmedialwhichdon’tinitiatestresscorrosioncracking(SCC)aslongasthesteelsareprotectedfromlocal izedcorrosion[1] .Theoriginal 30 4steelcanavoidpittingbutcrevicecorrosion .Ifcrevicecorrosionisavoidedbyadditionalalloyingto… 相似文献