ASTM_D_4058_-_96_2020.pdf

Designation:D405896(Reapproved 2020)Standard Test Method forAttrition and Abrasion of Catalysts and Catalyst Carriers1This standard is issued under the fixed designation D4058;the number immediately following the designation indicates the year oforiginal 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 This test method covers the determination of the attri-tion and abrasion resistance of catalysts and catalyst carriers.Itis applicable to tablets,extrudate,spheres,and irregularlyshaped particles larger than about116in.(1.6 mm)and smallerthan about34in.(19 mm).The materials used in developingthe method exhibited losses on attrition less than 7%;however,the method should be applicable to materials givingmuch higher attritions.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 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 issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 A sample of catalyst or catalyst carrier is rotated for afixed number of revolutions in a cylindrical drum having asingle baffle.Fines produced by attrition and abrasion in thetest are determined by sieving through a standard sieve.4.Significance and Use4.1 This test method is considered to be a measure of thepropensity of a catalyst to produce fines in the course oftransportation,handling,and use.However,there is no abso-lute level of acceptability.The values obtained are significantprincipally in relation to values for other materials(or othersamples of the same material)of comparable size.5.Apparatus5.1 A cylindrical drum with inside dimensions of 10 in.(254 mm)diameter and 6 in.(152 mm)long with a singleradial baffle 2 in.(51 mm)high extending the full length of thecylinder.A lid shall be provided and secured to the containerwithAllen-head screws,wing nuts or other suitable means as toensure that no fines escape during the test.The inside of thedrum should have a surface roughness no greater than about250 in.(6.4 m).(The roughness of cold-rolled steel or asmooth grind on a lathe is satisfactory.)A suitable design isshown in Fig.1.5.2 Any convenient means of rotation,such as a ball millroller,geared to give the desired rate of rotation of the drum.6.Sampling6.1 Obtain a representative sample of about 110 g of thematerial to be tested by gently splitting or quartering.Anysampling technique requiring extensive agitation or handlingwill cause some attrition and,therefore,compromise the resultsof the test.6.2 Gently sieve the sample on a No.20(850-m)ASTMsieve.6.3 Transfer the presieved sample to a widemouthed con-tainer tared to the nearest 0.01 g.6.4 Dry the presieved sample in air for 3 h at 400 C.It maybe necessary to modify or eliminate this step when testingmaterials that might be decomposed or drastically altered bythe drying conditions.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 May 15,2020.Published June 2020.Originallyapproved in 1981.Last previous edition approved in 2015 as D4058 96(2015).DOI:10.1520/D4058-96R20.2For 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 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 Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.NOTE1For example,an activated carbon catalyst may be treated for4 h at 190 C in a vacuum oven.6.5 Cool the d