Designation:D3766−08(Reapproved2013)StandardTerminologyRelatingtoCatalystsandCatalysis1ThisstandardisissuedunderthefixeddesignationD3766;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisterminologycoversdefinitionsoftermsrelatedtocatalystsandcatalysis.NOTE1—TheManualofSymbolsandTerminologyforPhysicochemi-calQuantitiesandUnitspresentsauthoritativedescriptionsofmanytermsusedinthefieldofcatalysis.22.Terminology2.1Definitions:activity,n—ofacatalyst,themeasureoftherateofaspecificcatalyticreactionconductedinthepresenceofacatalyst.calcine,v—incatalysis,toheatamaterialtoahightemperaturecausingaphysicalorchemicalchange,forexample,lossofmoistureandvolatilematter,oraphasechange,orboth.catalystbedsupport,n—anessentiallyinertplate,grid,particulatebed,orotherstructuralcomponentdesignedtoholduporbearaquantityofcatalystinacatalyticreactor.catalystcarrier,n—asolid,generallyporousmaterialuponthesurfaceorintothevoidsofwhichcatalyticmaterialsareplacedtocreatethedesiredcatalyst.DISCUSSION—Acarriermayhaveorcontributetocatalyticactivity.catalystsubstrate,n—lesspreferredalternativetermforcata-lystcarrier.catalystsupport,n—lesspreferredalternativetermforcatalystcarrier.crushstrength,n—incatalysis,ameasureoftheresistanceofformedcatalystsorcatalystcarriers,eithersinglyorinbulk,tolossofformwhensubjectedtoacompressiveforce.DISCUSSION—Formedcatalystsmayincludetablets,spheres,extrudates,rings,pellets,etc.andshouldbedistinguishedfrompowdersandgranules.density,packing(bulk),n—theratioofthemassofacollectionofdiscretepiecesofsolidmaterialtothesumofthevolumesof:thesolidsineachpiece,thevoidswithinthepieces,andthevoidsamongthepiecesoftheparticularcollection.density,particle(envelope),n—theratioofthemassofaparticletothesumofthevolumesof:thesolidineachpieceandthevoidswith...
