1、Designation:D835320Standard Guide forDetermination of Individual Particle Strength of Low SurfaceArea Catalysts and Catalyst Carriers by Drop Test onto aSteel Plate1This standard is issued under the fixed designation D8353;the number immediately following the designation indicates the year oforigina
2、l adoption or,in the case of revision,the year of last revision.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 The resistance to breakage of formed catalysts,catalystcarriers,or cataly
3、st pieces is determined by dropping a quantityof sample through a 25 ft length of 1 in.internal diameter pipeonto a steel plate.1.2 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 app
4、ro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDev
5、elopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3766 Terminology Relating to Catalysts and CatalysisD4058 Test Method for Attrition and Abrasion of Catalystsand
6、Catalyst CarriersD7084 Test Method for Determination of Bulk CrushStrength of Catalysts and Catalyst Carriers2.2 Other ASTM Documents:3STP447A Manual on Test Sieving MethodsIEEE/ASTM 10 American National Standard for MetricPractice3.Terminology3.1 DefinitionsSee Terminology D3766.3.2 Definitions of
7、Terms Specific to This Standard:3.2.1 low surface area,ndescribes material with measuredsurface areas of less than 10 m2/g(see IEEE/ASTM 10).4.Summary of Guide4.1 The resistance to breakage of formed catalysts,catalystcarriers,or catalyst pieces is determined by dropping a quantityof sample through
8、a 25 ft pipe of 1 in.internal diameter onto asteel plate.Particle strength is measured on a pass(nobreakage)or fail(breakage)basis and is calculated as percent-age passing the test without breakage.5.Significance and Use5.1 This guide is intended to provide information concern-ing the ability of for
9、med catalysts or catalyst carriers to resistparticle size reduction during use.It can be used by itself or inconjunction with other methods to assess catalytic materialintegrity,such as Test Methods D4058 and D7084.5.2 There are no known restrictions on sample geometry,asspheres,pellets,and hollow c
10、ylinders are suitable for testing.5.3 This guide,as written,is suitable for use for catalyticmaterials from about18in.to about34in.It can also be usedfor larger parts,but this requires using a larger diameter pipe.5.4 This guide is suitable for specification acceptance,manufacturing control,and rese
11、arch and development pro-cesses.6.Apparatus6.1 Steel(or Plastic)Pipe,25 ft long by 1.25 in.outsidediameter(1 in.inside diameter),mounted vertically about 6 in.above the metal plate.6.2 Steel Plate,approximately 15 in.x 15 in,x 0.5 in.6.3 Bottom-less BoxUsers might find it helpful to sur-round the st
12、eel plate with a bottom-less box to retain the testedparticles and facilitate cleanup.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 Oct.1,2020.Published Novembe
13、r 2020.DOI:10.1520/D8353-20.2For 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.3Visit theASTM website,www.astm.org,or
14、 contactASTM Customer Service atserviceastm.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 internationally recognized principles on standardization established in the Decisio
15、n on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.17.Reagents and Materials7.1 A reference material of similar composition to thesamples to be tested,assigned a consensus value,and
16、 ex-changed between the laboratories using the method.8.Hazards8.1 Small particles or chips may be produced when usingthis guide.Proper safety equipment and procedures should beused to ensure hands and eyes are protected during the test.9.Sampling,Test Specimens,and Test Units9.1 Test samples should be obtained from larger compositesby riffling or splitting in accordance with STP447A(section5.12)or some other suitable means with the aim of obtaining asample that represents the size distribution