简介：采用程序升温氮化的方法制备了钼氮化物催化剂，并用EXAFS方法研究了氮化前后Mo原子的局域配位情况。负载MoO3样品的径向结构函数中有三个峰其中前两个峰对应着最近的Mo-O配位壳层，但是第一个峰与第二个峰的比例比晶体MoO3中的比例大很多，表明分子筛负载的MoO3具有更紧密的结构。氮化以后，Mo2N样品的径向结构函数中有三个峰，对应于一个Mo-N和两个Mo-Mo配位壳层，与面心立方模型符合的很好。根据X射线衍射和EXAFS谱的计算表明，Mo2N中的N原子使Mo-Mo键拉长并削弱。分子筛负载的Mo2N样品具有与非负载Mo2N样品相似的径向结构函数，只是对应于Mo-N壳层的峰较弱，表明负载的MoO3更难氮化。
简介：本文在同一条件下分别测试了硫化态的催化剂ＣｏＭｏ／（ＴｉＯ２－Ａｌ２Ｏ３）及氨化态的Ｍｏ２Ｎ催化剂的加氢脱硫和加氢脱氮性能，结果表明，对于噻吩的加氢脱硫反应，硫化态催化剂ＣｏＭｏ／（ＴｉＯ２－Ａｌ２Ｏ３）在催化活性及稳定性方面都优于Ｍｏ２Ｎ，而Ｍｏ２Ｎ在吡啶的加氢脱氮反应中显示了较大优势．
简介：本文在同一条件下分别测试了硫化态的催化剂ＣｏＭｏ／（ＴｉＯ２－Ａｌ２Ｏ３）及氨化态的Ｍｏ２Ｎ催化剂的加氢脱硫和加氢脱氮性能，结果表明，对于噻吩的加氢脱硫反应，硫化态催化剂ＣｏＭｏ／（ＴｉＯ２－Ａｌ２Ｏ３）在催化活性及稳定性方面都优于Ｍｏ２Ｎ，而Ｍｏ２Ｎ在吡啶的加氢脱氮反应中显示了较大优势．
简介：Ｎｉ／Ｍｏ２ＮａｓａＨｉｇｈｌｙＡｃｔｉｖｅＨｙｄｒｏｄｅｎｉｔｒｏｇｅｎａｔｉｏｎＣａｔａｌｙｓｔＮｉ／Ｍｏ２ＮａｓａＨｉｇｈｌｙＡｃｔｉｖｅＨｙｄｒｏｄｅｎｉｔｒｏｇｅｎａｔｉｏｎＣａｔａｌｙｓｔ￥ＷｅｎＹｕＺＨＡＮＧ；ＸｉｎＰｉｎｇＷＡＮＧ；...
简介：Inthiswork,boththethermalexpansionandelectricalconductivityofnanocrystallineLa2Mo2O9werestudied.ThenanocrystallinepowderofLa2Mo2O9wasobtainedbysol-gelmethod,andwiththehelpofSHP(superhighpressure)upto4.5×104atmat700℃forashorttime,andthenanocrystallinepowderwasdensifiedwithoutobviousparticlesizegrowth.TheelectricalconductivityofnanocrystallineLa2Mo2O9wasoneorderofmagnitudelowerthanthatofthemicrocrystallinesampleatthesametemperature.Owingtothephasetransition,themicrocrystallineLa2Mo2O9hasanabruptincreaseofthermalexpansionwithapeakvalueof48×10-6K-1at556℃.Forthenanocrystallinematerial,thepeakvalueincreasesto112×10-6K-1at520℃.Ontheotherhand,above600℃thesignificantgrowthofparticlesizeofthenanocrystallineLa2Mo2O9wasobserved,accompanyingbyatremendousincreaseofthermalexpansionwithapeakvalueofthirdhigherthanthatofLa2Mo2O9.
简介：合成了一种未见报道的标题化合物（（C5N2H6）3（C5N2H7）3[（PO4）Mo12O36]·2H2O,Mr=2403.00）并得到单晶,晶体衍射实验发现其属于单斜晶系,P2（1）/n空间群,晶体学参数：a=13.316（3）,b=22.414（5）,c=20.063（4）,α=90.00（4）°,β=100.743（3）°,γ=90.00°,V=5883（2）3,Z=4,Dc=2.713Mg/m3,μ（MoKα）=2.608mm-1,F000=4604,最终R=0.0596,wR=0.1345,GoF=1.042.配体由由簇阴离子[（PO4）Mo12O36]3-之间通过端基氧与2-氨基吡啶形成氢键而相互连接,中间填充了一些水分子及2-氨基吡啶.
简介：ReactionsofCuSCNwithtetramethylthiuramdisulfideinCH3CNinthepresenceofstyreneandN,N,N',N',N'-pentamethyldiethylenetriaminegaverisetoanewcopper(Ⅰ)complexofN,N'-dimethyldithio-cabamate{[Cu(S2CNMe2)]2}n.ThetitlecompoundcrystallizedinthetriclinicP-1spacegroupwithlatticeparametersα=0.7610(4)nm,b=0.8911(4)nm,c=0.9268(5)nm,α=68.66(1)°,β=83.88(2)°,γ=79.31(2)°,V=0.5748(5)nm^3,Z=2.Thecompoundhasaunique1DchainstructurecomposedofCuSCSCuSCSeight-memberedringsandapairofCu-Sbonds,thestructureofwhichhasbeendeterminedbysingle-crystalX-raycrystallography.Theisolationofthiscompoundmayprovidesomehelpfulinformationforthecauseoftheinductionperiodsofthereverseatomtransferradicalpolymerization.
简介：Linearcomplexityandk-errorlinearcomplexityofthestreamcipheraretwoimportantstandardstoscaletherandomicityofkeystreams.Forthe2n-periodicperiodicbinarysequencewithlinearcomplexity2n1andk=2,3,thenumberofsequenceswithgivenk-errorlinearcomplexityandtheexpectedk-errorlinearcomplexityareprovided.Moreover,theproportionofthesequenceswhosek-errorlinearcomplexityisbiggerthantheexpectedvalueisanalyzed.
简介：Twonewdicyanamidecoordinationpolymers,{Mn(dmpz)[N(CN)2]2}2(1)and{Cu(dmpz)[N(CN)2]2}2(2)(dmpz=3,5-dimethylpyrazole),weresynthesizedandcharacterizedbysinglecrystalX-raydiffractionanalysisandIRspectroscopy.In1and2themetalionshavetwodifferentcoordinationmodes,whereoneiscoordinatedtofourdicyanamideanionsandtwomonodentatedmpzmoleculestoformaslightlydistortedoctahedralgeometry,whiletheotheradoptsoctahedralgeometry,surroundedbyfournitrileNatomsandtwoamideNatomsofthedicyanamideanions.Bothcomplexescontaintwoalternatingchainsthatareparalleltoeachother.
客服QQ：30444492琼网文【2021】1550-113号
增值电信业务经营许可证：琼B2-20210322
出版物经营许可证：新出发龙华出字第(2021)009号
广播电视节目制作经营许可证：(琼)字第00779号
版权所有 ©2002-2024 期刊网(www.qikanchina.com) 琼ICP备2021005105号
![Synthesis and Characterization of Surfactant-encapsulated Polyoxoanions: [(CnH<b style='color:red'>2</b><b style='color:red'>n</b>+1)<b style='color:red'>2</b><b style='color:red'>N</b>（CH3）<b style='color:red'>2</b>]12[<b style='color:red'>Mo</b>36（NO）4O108（H）<b style='color:red'>2</b>O)16] （<b style='color:red'>n</b>=12, 18）](/image/thesis6 "Synthesis and Characterization of Surfactant-encapsulated Polyoxoanions: [(CnH<b style='color:red'>2</b><b style='color:red'>n</b>+1)<b style='color:red'>2</b><b style='color:red'>N</b>（CH3）<b style='color:red'>2</b>]12[<b style='color:red'>Mo</b>36（NO）4O108（H）<b style='color:red'>2</b>O)16] （<b style='color:red'>n</b>=12, 18）")
![新型杂多酸（C5<b style='color:red'>N</b><b style='color:red'>2</b>H6）3（C5<b style='color:red'>N</b><b style='color:red'>2</b>H7）3[（PO4）<b style='color:red'>Mo</b>12O36]·<b style='color:red'>2</b>H<b style='color:red'>2</b>O的水热合成与晶体结构](/image/thesis13 "新型杂多酸（C5<b style='color:red'>N</b><b style='color:red'>2</b>H6）3（C5<b style='color:red'>N</b><b style='color:red'>2</b>H7）3[（PO4）<b style='color:red'>Mo</b>12O36]·<b style='color:red'>2</b>H<b style='color:red'>2</b>O的水热合成与晶体结构")
![Synthesis and Crystal Structure of <b style='color:red'>N</b>,<b style='color:red'>N</b>＇-Dimethyldithio-arbamato-Copper（Ⅰ） Polymer {[Cu（Me<b style='color:red'>2</b>dtc）]<b style='color:red'>2</b>}<b style='color:red'>n</b>](/image/thesis16 "Synthesis and Crystal Structure of <b style='color:red'>N</b>,<b style='color:red'>N</b>＇-Dimethyldithio-arbamato-Copper（Ⅰ） Polymer {[Cu（Me<b style='color:red'>2</b>dtc）]<b style='color:red'>2</b>}<b style='color:red'>n</b>")
![Two New Dicyanamide Coordination Polymers with Alternating Parallel Chains： {Mn（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b> and {Cu（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b>](/image/thesis19 "Two New Dicyanamide Coordination Polymers with Alternating Parallel Chains： {Mn（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b> and {Cu（dmpz）[<b style='color:red'>N</b>（CN）<b style='color:red'>2</b>]<b style='color:red'>2</b>}<b style='color:red'>2</b>")