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500 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:二高度光铕(III)和铽(III)准备有succinimide(SI)和N-hydroxysuccinimide(NHSI)建筑群被报导,它进一步通过元素化学分析,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。通过这些分析收集数据揭示了Eu(III)形成,有上面的Tb(III)建筑群对ligand在金属提及ligands(M:L)1:3臼齿比率。光中心从photoluminescent系列调查被保留关于通过lanthanide协作地点有效促进感受性有趣结论。当时,强壮光排放在Eu(III)-SI和Tb(III)-NHSI建筑群情况下被观察-SI建筑群展出了相应Eu(III)-NHSI和Tb(III)没有相片光性质。最新获得光lanthanide建筑群可能具有为在光电子各种各样应用特别兴趣。

  • 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方式对N08904超级奥氏体不锈钢液相线温度进行了计算测试,提出了合理过热度参数,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问题,为5N高纯铋生产提出了一条新可行途径。

  • 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
  • 简介:介绍了江西铜业集团公司贵溪冶炼厂动力1^#、2^#抛煤机锅炉除尘器运行状况,对影响文丘里水膜除尘效率各种因素进行了详细分析,并介绍了提高文丘里水膜除尘效率一些措施及取得效果。

  • 标签: 锅炉 除尘器 效率 因素分析 效果分析
  • 简介:EffectofLa-richrareearthoneutecticmicrostructureinA1-2%Fealloywasstudied.WhentheadditionofREissmall,a-A1phaseisintheformofcellulardendrite.WiththeincreaseoftheadditionofRE,thenucleationandgrowthofa-A1dendritearesuppressed,andeutecticAl3Fephaseisrefined.WhentheadditionofREgetsto0.6%(massfrac-tion),thesizeofeutecticAl3Feincreases.Inaddi-tion,mechanismoftheeffectofmixedREoneutecticmorphologyofA1-2%Fealloyisexplored.

  • 标签: 共熔铝铁合金 稀土元素 微观结构 精炼方法 金属材料
  • 简介:EffectofMnsubstitutionforFeincubicLavesZr0.1Tb0.9(Fe1-xMnx)2andY0.1Tb0.9(Fe1-xMnx)2com-poundsispresented.Similarresultsinbothsystemsareobtained:ThestructureandthemagnetismofTbFe2arebothinfluencedslightlybyasmallamountofYorZrsubstitutionforTb;Withincreasingxvalue,thelatticeconstantincreasesmonotonously;theCurietemperaturedecreaseslinearly;whilesaturationmagnetizationincreaseslinearly.ForthesmallamountofMnsubstitutionforFeinbothsystems,magnetostrictionissignificantlylargerthanthatinthepureironalloys.Thelargestmagnetostrictionof|γ‖-|γ|=2200×10-6atmagneticfieldof2×107/4πA/misobtainedforY0.1Tb0.9(Fe0.95Mn0.052.

  • 标签: MN MAGNETOSTRICTION Magnetic properties Cubic Laves
  • 简介:本文主要进行了二价铜在溶液中用亚硫酸根将其还原成一价铜,并用氯离子作为沉淀剂制取氯化亚铜研究。氯化亚铜生成过程中会产生H+,反应体系pH对氯化亚铜产品收率影响最大,所以过程中可通过滴加碳酸钠来控制体系酸度,并根据还原反应发生速度控制碳酸钠滴加速度来中和体系中生成酸,保持体系pH在2.0~3.0,使氯化亚铜产率达到92%以上。

  • 标签: 亚硫酸钠 硫酸铜 氯化亚铜 还原法