1、Designation:D451203(Reapproved 2013)1Standard Test Method forVibrated Apparent Packing Density of Fine Catalyst andCatalyst Carrier Particles and Powder1This standard is issued under the fixed designation D4512;the number immediately following the designation indicates the year oforiginal adoption o
2、r,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.1NOTEFootnote 3 was updated editorially in May 2013.1.Scope1.1 This test method covers the deter
3、mination of the appar-ent packing density of fine catalyst and catalyst carrier powderssmaller than 0.8 mm in diameter.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesa
4、fety 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:2D3766 Terminology Relating to Cata
5、lysts and CatalysisE177 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.Terminology3.1 DefinitionsSee Terminology D3766.4.Significa
6、nce and Use4.1 This test method is for measuring the apparent packingdensity of catalyst or catalyst carrier powders that are smallerthan 0.8 mm in diameter.5.Apparatus5.1 Glass Cylinders,capacity 100 mL,feed and measuring.5.2 Vibrator,3conventional hand-held,with hard rubber ormetal impactor.5.3 Fe
7、ed Funnel,plastic,glass,or metal as shown in Fig.1.5.4 Ring Stand,vibrator holder and clamps as shown inFigs.2 and 3.5.5 Desiccator,with a desiccant grade molecular sieve suchas 4A.5.6 Balance,having sensitivity of 0.1 g.5.7 Drying Oven.6.Procedure6.1 Heat an adequate amount of sample(s)at 400 6 15C
8、for not less than 3 h.Normally,this treatment can take place inair;however,in the case of materials that might react with airat elevated temperatures(such as,prereduced catalysts)theheat treatment shall take place in an inert atmosphere.Afterheating,cool the test sample(s)in a desiccator or other su
9、itablecontainer to eliminate the possibility of moisture adsorptionprior to testing.NOTE1These conditions may not be appropriate for all materials.NOTE2Since many catalyst formulations are strong adsorbents,theuse of 4A indicating(cobalt-treated)molecular sieve as a desiccatingmedium is suggested.Th
10、e desiccant should be regenerated at 493 K(220C)to 533 K(260C),as required.6.2 Fill a feed glass cylinder with 100 mLof loosely packed,dried sample.6.3 Turn on the vibrator and carefully add sample(s)to thetared,measuring cylinder through the feed funnel.1This test method is under the jurisdiction o
11、f ASTM Committee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved March 1,2013.Published March 2013.Originallyapproved in 1985.Last previous edition approved in 2008 as D451203(2008).DOI:10.1520/D4512-03R13E01.2For ref
12、erenced 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.3The sole source of supply of the vibrator known to the committee at this
13、timeis Wahl Clipper Corp.,Sterling,IL.They recommend their Model 4120 used at lowspeed to replace their Model 4180,which is discontinued.If you are aware ofalternative suppliers,please provide this information to ASTM InternationalHeadquarters.Your comments will receive careful consideration at a me
14、eting of theresponsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.4 Transfer all of the sample to the measuring cylinder at auniform rate not less than 2 mL or exceeding 3 mL/s.Theentire t
15、ransfer time shall be between 35 and 50 s.6.5 After 60 additional seconds turn off the vibrator.Readthe vibrated volume,V,to the nearest millilitre by estimatingthe average level of the sample surface in the cylinder.Immediately weigh the sample and cylinder to the nearest tenthof a gram.7.Calculati
16、on7.1 Calculate the apparent packing density as follows:APD5 W/V(1)where:APD=apparent packing density,g/mL,W=mass of sample particles,g,andV=volume occupied by sample particles in measuringcylinder,mL.7.2 Apparent packing densities are typically reported tothree significant figures.7.3 The average of two or more runs is to be reported.8.Precision and Bias48.1 Test ProgramAn interlaboratory study was conductedin which the named property was measured in two separate testmaterials in four separate
