ASTM_D_4058_-_96_2011e1.pdf

Designation:D405896(Reapproved 2011)1Standard 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.1NOTEUpdated text in 3.1 editorially in August 2011.1.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 and health practices and determine the applica-bility of regulatory limitations prior to use.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 Acylindrical drum with inside dimensions of 10 in.(254mm)diameter and 6 in.(152 mm)long with a single radialbaffle 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 400C.It maybe necessary to modify or eliminate this step when testingmaterials that might be decomposed or drastically altered bythe drying conditions.NOTE1For example,an activated carbon catalyst may be treated for4 h at 190C in a vacuum oven.6.5 Cool the dried sample for at least 30 min in a desiccatorusing freshly regenerated 4Amolecular sieves as the desiccant.The molecular sieves shall be regenerated at 220 to 260C.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 1981.Last previous edition approved in 2006 as D405896(2006).DOI:10.1520/D4058-96R11E01.2For 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 States1 NOTE2Multiple samples can be handled simultaneously in 6.4 and6.5.However,they should remain in a desiccator before analyzing.7.Procedure7.1 Clean the test cylinder and lid of the apparatus using afine-bristle brush.7.2 Weigh about 100 g of the pretreated sample from 6.5 tothe nearest 0.01 g.Record this weight as A.7.3 Transfer the weighed sample into the test cylinder.7.4 Carefully seal the cover and position the test cylin