ASTM D3906-2003(2008) 测定八面沸石型含沸石材料的相对X射线衍射强度的试验方法

作者:标准资料网 时间:2024-05-17 18:47:30  浏览:8985   来源:标准资料网

【英文标准名称】:StandardTestMethodforDeterminationofRelativeX-rayDiffractionIntensitiesofFaujasite-TypeZeolite-ContainingMaterials
【原文标准名称】:测定八面沸石型含沸石材料的相对X射线衍射强度的试验方法
【标准号】:ASTMD3906-2003(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D32.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:catalyst;faujasite;X-raydiffraction;zeolite;Faujasitecrystalzeolites;X-raydiffractionanalysis;Zeolitecatalysts
【摘要】:ZeolitesYandX,particularlyforcatalystandadsorbentapplications,areamajorarticleofmanufactureandcommerce.Catalystsandadsorbentscomprisingthesezeolitesinvariousformsplusbinderandothercomponentshavelikewisebecomeimportant.Y-basedcatalystsareusedforfluidcatalyticcracking(FCC)andhydrocrackingofpetroleum,whileX-basedadsorbentsareusedfordesiccation,sulfurcompoundremoval,andairseparation.ThisX-rayprocedureisdesignedtomonitortheseYandXzeolitesandcatalystsandadsorbents,providinganumbermoreorlesscloselyrelatedtopercentzeoliteinthesample.Thisnumberhasprovenusefulintechnology,research,andspecifications.DrasticchangesinintensityofindividualpeaksintheXRDpatternsofYandXcanresultfromchangesofdistributionofelectrondensitywithintheunitcellofthezeolite.Theelectrondensitydistributionisdependentupontheextentoffillingofporesinthezeolitewithguestmolecules,andonthenatureoftheguestmolecules.InthisXRDmethod,theguestmoleculeH2Ocompletelyfillsthepores.IntensitychangesmayalsoresultifsomeorallofthecationsinYandXareexchangedbyothercations.Becauseofthefactorsmentionedin4.3thatcouldvarytheintensitiesoftheXRDpeaks,thisXRDmethodwillprovidethebestdeterminationofrelativecrystallinitywhenthereferenceandsamplehaveasimilarhistoryofpreparationandcomposition.CorrectionsarepossiblethatcanmakethisXRDmethodaccurateformeasuringpercentzeoliteinmanyspecificsituations.ThesecorrectionsarewellknowntothoseskilledinX-raydiffraction.Itisnotpracticaltospecifythosecorrectionshere.1.1ThistestmethodcoversthedeterminationofrelativeX-raydiffractionintensitiesofzeoliteshavingthefaujasitecrystalstructure,includingsyntheticYandXzeolites,theirmodificationssuchasthevariouscationexchangeforms,andthedealuminized,decationated,andultrastableformsofY.Thesezeoliteshavecubicsymmetrywithaunitcellparameterusuallywithinthelimitsof24.2and25.0x02DA;?/span>(2.42and2.50nm).1.2Thesamplesincludezeolitepreparationsinthevariousforms,andcatalystsandadsorbentscontainingthesezeolites.1.3Thetermx201C;intensityofanX-raypowderdiffraction(XRD)peakx201D;isthex201C;integralintensity,x201D;eithertheareaofcountsunderthepeakortheproductofthepeakheightandthepeakwidth.1.4ThistestmethodprovidesanumberthatistheratioofintensityofportionsoftheXRDpatternofthesampletointensityofthecorrespondingportionofthepatternofareferencezeolite,NaY.(LaboratoriesmayuseamodifiedYorX,forexample,REYasasecondarystandard.)Theintensityratio,expressedasapercentage,isthenlabeledx201C;%XRDintensity/NaY.x201D;1.5Undercertainconditionssucharatioisthepercentzeoliteinthesample.Theseconditionsinclude:1.5.1Thezeoliteinthesampleisthesameasthereferencezeolite.1.5.2Theab......
【中国标准分类号】:D52;G74
【国际标准分类号】:71_060_01
【页数】:7P.;A4
【正文语种】:英语