【英文标准名称】:StandardTestMethodforGammaAluminaContentinCatalystsContainingSilicaandAluminabyX-rayPowderDiffraction
【原文标准名称】:用X-射线粉末衍射法对触煤剂中含硅和铝矾土的触煤剂中伽马铝矾土含量的试验方法
【标准号】:ASTMD4926-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:D32.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:氧化铝;催化剂;试验;X射线衍射分析
【英文主题词】:alumina;catalysts;gammaalumina;gammaaluminacontent;x-raypowderdiffraction
【摘要】:Thistestmethodisforestimatingtherelativeamountofgammaaluminaincalcinedcatalystsamples,assumingthattheX-raypowderdiffractionpeakoccurringatabout67x00B0;2x03B8;isattributabletogammaalumina.Gammaaluminaisdefinedasatransitionaluminaformedafterheatingintherangefrom500to550x00B0;C,andmayincludeformsdescribedintheliteratureaseta,chi,andgammaaluminas.Deltaaluminahasadiffractionpeakinthesameregion,butisformedabove850x00B0;C,atemperaturetowhichmostcatalystsofthistypearenotheated.Thereareotherpossiblecomponentswhichmaycausesomeinterference,suchasalpha-quartzandzeoliteY,aswellasaluminum-containingspinelsformedatelevatedtemperatures.Ifthepresenceofinterferingmaterialissuspected,thediffractionpatternshouldbeexaminedingreaterdetail.Moresignificantinterferencemaybecausedbythepresenceoflargeamountsofheavymetalsorrareearths,whichexhibitstrongX-rayabsorptionandscattering.Comparisonsbetweensimilarmaterials,therefore,maybemoreappropriatethanthosebetweenwidelyvaryingmaterials.1.1ThistestmethodcoversthedeterminationofgammaaluminaandrelatedtransitionaluminasincatalystscontainingsilicaandaluminabyX-raypowderdiffraction,usingthediffractedintensityofthepeakoccurringatabout672whencopperKradiationisemployed.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G60
【国际标准分类号】:71_040_30
【页数】:2P.;A4
【正文语种】: