1、Designation:D451322Standard Test Method forParticle Size Distribution of Catalytic Materials by Sieving1This standard is issued under the fixed designation D4513;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.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 test method covers the determination of particlesize distribution of catalytic powder material using a sievinginstrument and is o
3、ne of several found valuable for themeasurement of particle size.This test method is particularlysuitable for particles in the 20 to 420 m range.(See Termi-nology D3766.)1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.
4、2.1 ExceptionIn 5.2,mesh size is the standard unit ofmeasure.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
5、the applicability of regulatory 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 iss
6、ued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3766 Terminology Relating to Catalysts and CatalysisE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE105 Guide for Probability Sampling of MaterialsE161 Specificati
7、on for Electroformed Material and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and Statistics3.Summary of Test Method3.1 A 50%relative humidity-equilibrated sample of knownweight is allowed to fractionate on a series of vario
8、us sizesieves to allow the various particle sizes to be collected onsuccessively smaller sieve openings.3.2 The sample fraction collected on each sieve of the seriesis weighed and its fractional part of the original sample isdetermined.4.Significance and Use4.1 This test method can be used to determ
9、ine particle sizedistributionsofcatalystsandsupportsformaterialsspecifications,manufacturing control,and research and devel-opment work.5.Apparatus5.1 Laboratory Sieving Instrument,automatic with timerpreferred.5.2 U.S.Standard Sieves,or equivalent,to include microme-tres(mesh)425(40),250(60),177(80
10、),149(100),105(140),74(200),44(325)and electroformed 30 and 20 micrometres.Because of their superior uniformity and resistance to distor-tion or damage during use,electroformed sieves,preferablywith square holes,are recommended.Sieves with diametersbetween 6 and 10 cm are suggested.5.3 Ultrasonic Cl
11、eaning Tank,100 W.5.4 Transmitted Light Microscope,300 magnification,withcalibrated scale eyepiece.5.5 Heat Gun Dryer,(hair dryer or equivalent).5.6 Analytical Balance,capable of weighing to 0.001 g.5.7 Sample Splitter,Chute Type,or Spinning Riffler,withspinning riffler preferred.6.Reagents6.1 Antis
12、tatic Coating,(record cleaning spray or equiva-lent).6.2 Alcohol-Water SolutionOne part ethanol to nine partsdeionized or distilled water.1This test method is under the jurisdiction of ASTM Committee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Prope
13、rties.Current edition approved Oct.1,2022.Published October 2022.Originallyapproved in 1985.Last previous edition approved in 2017 as D4513 11(2017).DOI:10.1520/D4513-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual B
14、ook of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized
15、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.Sampling7.1 Obtain a representative sample of material from largercompo
16、sites by riffling or splitting in accordance with subsec-tion 5.12 of STP 447A,3or some other suitable means,with theaim of obtaining a sample that represents the size distributionof the larger composite.The analyst should also consult GuideE105 to help develop a sampling plan.7.1.1 The sample must be free-flowing and homogeneous.Ifparticle size segregation is apparent to either the eye or fromobservation under a microscope,remix and resample thematerial using the proper riffling procedure.7.2 E
