1、Designation:D451311Standard 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.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionIn 5.2,mesh size
4、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 and health practices and determine the applica-bility of regulatory limitations
5、prior to use.2.Referenced Documents2.1 ASTM Standards:2E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE161 Specification for Precision Electroformed SievesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and Statistics3.Su
6、mmary of Test Method3.1 A 50%relative humidity-equilibrated sample of knownweight is allowed to fractionate on a series of various 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 weig
7、hed and its fractional part of the original sample isdetermined.4.Significance and Use4.1 This test method can be used to determine particle sizedistributionsofcatalystsandsupportsformaterialsspecifications,manufacturing control,and research and devel-opment work.5.Apparatus5.1 Laboratory Sieving In
8、strument,automatic with timerpreferred.5.2 U.S.Standard Sieves,or equivalent,to include microme-tres(mesh)425(40),250(60),177(80),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,electrofo
9、rmed sieves,preferablywith square holes,are recommended.Sieves with diametersbetween 6 and 10 cm are suggested.5.3 Ultrasonic Cleaning 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,capa
10、ble of weighing to 0.001 g.5.7 Sample Splitter,Chute Type,or Spinning Riffler,withspinning riffler preferred.6.Reagents6.1 Antistatic Coating,(record cleaning spray or equiva-lent.)6.2 Alcohol-Water SolutionOne part ethanol to nine partsdeionized or distilled water.7.Sampling7.1 The sample must be f
11、ree-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 Equilibrate the sample at 20 to 25C(68 to 77F)in adesiccator with a humidity level of 50%.A 24-h period i
12、susually sufficient.1This test method is under the jurisdiction of ASTM Committee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved Aug.1,2011.Published August 2011.Originallyapproved in 1985.Last previous edition appro
13、ved in 2006 as D451397(2006).DOI:10.1520/D4513-11.2For 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 onthe ASTM website.Copyright ASTM I
14、nternational,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Calibration and Standardization8.1 Prior to use,check all sieves for damage or impropercleaning.If woven-wire sieves are used rather than the pre-ferred electroformed sieves,it is especially important toc
15、arefully inspect the wire surface for wear,misalignment,tears,creases,or separation along the edges.NOTE1Specifications for wire cloth sieves are described in Specifi-cation E11 and specifications for electroformed sieves are described inSpecification E161.9.Procedure9.1 Select appropriate sieves fo
16、r the sample being analyzed,typically the 149,105,74,44,and 20-m sieves.NOTE2For optimum results,the estimated particle size should bedetermined by microscopic examination at 100300X.Sieves may then beselected to cover the size range of the particles.9.2 Clean 44 and 20-m sieves prior to use in an ultrasonicbath using a 10%ethanol,90%water mixture.Dry the sievesin a low temperature air jet(hair dryer or equivalent)and allowto equilibrate at room temperature for 30 min before obtainingthe tare we
