1、Designation:D841322Standard Guide forMeasuring the Water Pore Volume of Catalytic Materials byCentrifuge1This standard is issued under the fixed designation D8413;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revis
2、ion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide describes how to measure the pore volume ofcatalytic materials by water immersion with the excess waterremoved with a cent
3、rifuge.The measured pore volume isconverted to the dry pore volume by using the loss on ignition(LOI)of the material.It is generally applicable to bothpowdered materials and particles greater than about 1 mm.1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measu
4、rement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regu
5、latory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Or
6、ganization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3766 Terminology Relating to Catalysts and CatalysisD4284 Test Method for Determining Pore Volume Distribu-tion of Catalysts and Catalyst Carriers by Mercury Intru-sion PorosimetryD6761 Test Method for Det
7、ermination of the Total PoreVolume of Catalysts and Catalyst CarriersE1272 Specification for Laboratory Glass Graduated Cylin-ders2.2 Other ASTM Documents:3STP 447A Manual on Test Sieving Methods3.Terminology3.1 DefinitionsSee Terminology D3766.3.2 Definitions of Terms Specific to This Standard:3.2.
8、1 water pore volume,nalso known as the pore volumedetermined by water absorption,is a measure of the porosity ofa catalytic material.4.Summary of Guide4.1 This guide measures pore volume by water immersionwith the excess water removed with a centrifuge.The measuredpore volume is converted to the dry
9、 pore volume by using theLOI of the material.5.Significance and Use5.1 This guide provides an alternative way to measure theporosity of catalytic materials without the use of mercuryporosimetry.It is useful for research and development as wellas quality control purposes.(See Test Methods D4284 andD6
10、761.)6.Interferences6.1 There are no known interferences.This method cannotbe used for materials that react with or dissolve in water.7.Apparatus7.1 Balance,accurate to nearest 0.0001 g.7.2 Centrifuge Tubes,custom made according to the draw-ings shown in Figs.1 and 2.Fig.1 depicts the tube designed
11、forparticles.As drawn,Fig.1 illustrates a holder for measuring5 mm particles as the hole sizes shown are 5 mm.The holesizes used must be small enough to retain the sample whenanalyzing smaller pieces.Fig.2 describes the tube used forpowders.These tubes can be fabricated from any suitablematerial,inc
12、luding glasses such as borosilicate glass or plasticssuch as nylon.1This guide is under the jurisdiction of ASTM Committee D32 on Catalysts andis the direct responsibility of Subcommittee D32.02 on Physical-MechanicalProperties.Current edition approved April 1,2022.Published April 2022.Originallyapp
13、roved in 2021.Last previous edition approved in 2021 as D8413 21.DOI:10.1520/D8413-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page
14、 onthe ASTM website.3Available from the ASTM website,www.astm.org,or contact ASTM CustomerService at serviceastm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationall
15、y recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.17.3 Centrifuge,capable of a force of at least 456 G andequip
16、ped with timer,speed control and shields,such as aDynac 11 or equivalent.(See Note 1.)NOTE1The relative centrifuge force(RCF)should be 456 G.For theDynac 11,this corresponds to a speed of 1500 rpm.RCF is given by:Rpm5=RCF/28.4 r!31000 where r is the top radius in inches of therotor.7.4 Beaker,1000 mL.7.5 Graduated Cylinder,capacity 100 mL,conforming toSpecification E1272,Class A.7.6 Porcelain Crucible,100 mL.7.7 Furnace,capable of 482 C.7.8 Timer.8.Reagents and Materials8.1 Deionized water(DI)or
