学科分类
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15 个结果
  • 简介:Thecrackingandaromatizationofn-hexaneoverH-ZSM-5modifiedbyvariousrareearthswereinvestigatedbymeansofcontinuousflowmicro-reactor.ThesurfacepropertiesofmodifiedH-ZSM-5catalystswereobtainedfromIR,XRDandXPS.Theresultsshowthattherareearthsenhancethearomatizingpropertiesofthecatalystswhicharepreparedbymechanicalmixturemethod.Theresultsofn-hexanecrackingandaromatizationarecorrelatedwiththeacidity.TheBrnstedacidicsitesaretheactivesitesofn-hexanearomatization,whileLewisacidsiteplaysanimportantroleinn-hexanecracking.

  • 标签: 稀土 正己烷 芳构化 沸石 ZSM-5催化剂
  • 简介:Silicawasused,asacatalystcarrier,toloadceroussulfateforcatalyzingthesynthesisofn-butylacetate.Themainpurposeofthisresearchwastoexplorethefeasibilityofsilicainimprovingthedecentralityandactivityofthecatalyst.Theeffectsofmolarratioofbutylalcoholtoaceticacid,theceroussulfateloadingsandthereactiontimeontheconversionofaceticacidwerestudiedbysinglefactorexperimentmethodandorthogonalexperimentmethodrespectively.Therefractiveindex(n20D)andmolecularstructureofthepreparedn-butylacetateweremeasuredbyAbbeRaefractometerandFourierTransformInfraredspectroscope,respectively.Thecomparisonsofthesilicaloadedandunloadedcatalystsforcatalyzingthesynthesisofn-butylacetateweremade.Theresultsshowedthatthesuitableconditionsforsynthesizingn-butylacetatewere:molarratioofbutylalcoholtoaceticacidof1.4∶1,uselevelofloadedceroussulfateof0.30gandreactiontimeof50min,respectively.Themaximumconversionofaceticacidforthesilicaloadedcatalystreached98.62%whichwas12.32%and16.43%higherthanthosefortheunloadedcatalystsreportedinliteratures,buttheuselevelofceroussulfatefortheformerwasmuchlessthanthoseforthelattersundersimilaroptimaltechnicalconditions.Thesilicawasprovedtobeagoodcatalystcarrierforenhancingdecentralityandactivityofthecatalystandincreasingtheconversionofaceticacid.Therepentanceofthesilicaloadedceroussulfatewasalsoinvestigatedintheexperiment.

  • 标签: BUTYL ACETATE cerous SULFATE SILICA CATALYSIS
  • 简介:SeveralREEdatasetswerecollectedinCoreDD2andEC2005intheinnershelfofEastChinaSea,CoreY127inthenorthernOkinawaTrough,CoreNT1,C9247andC92169inthesouthYellowSeatochecktheapplicabilityoftheδEuN-ΣREEsmodelforquantita-tivelydistinguishingsedimentsfromtheYangtzeRiverandtheYellowRiver.Bycomparison,severalsedimentsincoresDD2,EC2005,Y127aregenerallyinaccordancewiththismodel.ThecoresNT1,C9247andC92169,whichhavebeeninfluencedbytheYangtzeRiverandtheYellowRivertogether,however,wereinconsistentwiththeδEuN-ΣREEsmodel.TheδEuN-ΣREEsplotanditscorrespondingregressionequation,whichcouldbeusedtodistinguishsediments"intuitivelyandquantitatively"fromtheYangtzeRiver,andtheYellowRivershouldbereconsideredorreassessed.

  • 标签: rare earths sediment PROVENANCE YANGTZE RIVER
  • 简介:二高度光的铕(III)和铽(III)的准备有succinimide(SI)和N-hydroxysuccinimide(NHSI)的建筑群被报导,它进一步通过元素的化学分析,热分析,英尺红外,粉末X光检查衍射,SEM和荧光光谱学被调查。通过这些分析收集的数据揭示了Eu(III)的形成,有上面的Tb(III)建筑群对ligand在金属提及ligands(M:L)1:3的臼齿的比率。光中心从photoluminescent系列调查被保留的关于通过lanthanide的协作地点的有效促进感受性的有趣的结论。当时,强壮的光排放在Eu(III)-SI和Tb(III)-NHSI建筑群的情况下被观察-SI建筑群展出了的相应Eu(III)-NHSI和Tb(III)没有相片光性质。最新获得的光lanthanide建筑群可能具有为在光电子的各种各样的应用的特别兴趣。

  • 标签: 光致发光光谱 铕(Ⅲ) 铽配合物 羟基 稀土配合物 基础
  • 简介:采用理论计算与热分析相结合的方式对N08904超级奥氏体不锈钢的液相线温度进行了计算测试,提出了合理的过热度参数,解决了连铸易漏钢问题,实现了连铸生产。

  • 标签: 超级奥氏体不锈钢 连铸 热分析
  • 简介:利用某公司生产的精铋(4N)作为阳极,采用氟硅酸铋-氟硅酸溶液为电解液,进行精铋电解生产5N高纯铋试验。试验结果表明,以氟硅酸铋-氟硅酸溶液作为电解液,进行精铋电解能生产出5N高纯铋,解决了传统铋电解精炼过程中杂质铅难以除去的问题,为5N高纯铋的生产提出了一条新的可行途径。

  • 标签: 精铋 氟硅酸 电解 5N高纯铋
  • 简介:介绍了奥氏体焊缝组织及薄板在超声波探伤检测应用的主要难点,描述了常规扫描成像超声检测方法和相控阵超声检测方法两种检测方法特点,针对生产的4mm厚纯镍N6板材焊接组织采用两种方法进行探伤检测试验,选定检测设备型号、焊接方法及焊接参数,按照检测要求制备试验试块。通过检测分析得出,常规超声检测方法在较好的条件下,仍然对厚度、组织特性无法实现有效检测;相控阵超声检测方法能够明显的检测出薄板焊缝奥氏体组织缺陷。

  • 标签: 奥氏体 超声波 焊接 相控阵