ASTM D6175-2003 Standard Test Method for Radial Crush Strength of Extruded Catalyst and Catalyst Carrier Particles《挤压催化剂和催化剂载体颗粒辐射抗压强度的标准试验方法》.pdf
《ASTM D6175-2003 Standard Test Method for Radial Crush Strength of Extruded Catalyst and Catalyst Carrier Particles《挤压催化剂和催化剂载体颗粒辐射抗压强度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6175-2003 Standard Test Method for Radial Crush Strength of Extruded Catalyst and Catalyst Carrier Particles《挤压催化剂和催化剂载体颗粒辐射抗压强度的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6175 03Standard Test Method forRadial Crush Strength of Extruded Catalyst and CatalystCarrier Particles1This standard is issued under the fixed designation D 6175; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers and is suitable for determiningthe resistance of extruded catalysts and catalyst carr
3、iers tocompressive force from the side.1.2 This test method was developed using extruded catalystand catalyst carriers from116 to18 in. in diameter (0.159 to0.318 cm) and limited to pieces with a length to diameter ratiogreater than or equal to 1:1. This test method may be applicableto other diamete
4、rs.1.3 This test method is suitable for the determination ofmean crush strength per millimetre in the range of 0 to 15lbf/mm (0 to 65 N/mm).1.4 The values stated in pounds lbf/mm units are to beregarded as the standard. The values given in parentheses areprovided for information only.1.5 This standa
5、rd 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 to determine theapplicability of regulatory limitations before use.2. Referenced Documents2.1 ASTM
6、 Standards:2D 3766 Terminology Relating to Catalysts and CatalysisE 177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE 456 Terminology Relating to Quality and StatisticsE 691 Practice for Conducting and Interlaboratory Study toDetermine the Precision of a Test Method3. Termino
7、logy3.1 DefinitionsSee Terminology D 3766.3.2 Definitions of Terms Specific to This Standard:3.2.1 extruded catalyst particlescylindrical particles withuniform cross sections, either solid, hollow core, or multi-lobed, formed by extrusion.4. Summary of Test Method4.1 Individual extrudates taken from
8、 a representativesample are calcined, measured in length, placed between twoflat surfaces, and subjected to a compressive force. The forcerequired to crush the extrudate is measured. The procedure isreplicated, the force per millimetre calculated, and the averageof all quotients determined.5. Signif
9、icance and Use5.1 This test method is intended to provide information onthe ability of an extruded catalyst to retain physical integrityduring use.6. Apparatus6.1 A suitable compression testing device is required, com-posed of the following:6.1.1 Calibrated Pressure or Force Gage, marked for directr
10、eading of the force in pounds force (Newtons) with a rangeabout two times the expected average force reading. A suitablesystem (mechanical, hydraulic, or pneumatic) must be pro-vided so that the rate of force applied is both uniform andcontrollable within specified limits (see 9.4).6.1.2 Tool Steel
11、Anvils, between which the sample will becrushed. The faces of the tool steel anvils shall be smooth andfree from hollows or ridges that would interfere with uniformcontact along the length of the extrudate. The faces shall beparallel to each along their entire length of travel. The faces ofboth anvi
12、ls must be longer in one dimension than the length ofthe sample pieces to be crushed.6.2 A device for determining length, reading in millimetres,and of suitable accuracy to measure to the nearest tenth.1This test method is under the jurisdiction of ASTM Committee D32 onCatalysts and is the direct re
13、sponsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved Oct. 1, 2003. Published October 2003. Originallyapproved in 1998. Last previous edition approved in 1998 as D 617598.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Cus
14、tomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Sampling7.1 A test sample of 50
15、 to 200 individual particles shall beobtained from larger composites by riffling or splitting accord-ing to STP 447A,3with the aim of obtaining a representativesample that represents both the shape and size of the largercomposite. The amount of the sample shall depend on theprecision required and th
16、e homogeneity of the material beingtested. All of the individual particles sampled that have a lengthto diameter ratio greater than or equal to one shall be tested.7.2 Heat the test sample(s) at 400 6 15C for not less than3h.NOTE 1Moisture pick-up by extrudates is often rapid and the mea-sured crush
17、 strength may be affected.7.3 After heating, cool the test sample(s) in a desiccator orother suitable container to prevent the adsorption of moisturebefore testing.NOTE 2If the catalyst may be damaged at 400C, a lower temperaturecan be used so long as it is specified with the result. Normally, thist
18、reatment can take place in air. However, for materials that might reactwith air at elevated temperatures (such as prereduced catalysts), the heattreatment should take place in an inert atmosphere.NOTE 3Since many catalyst formulations are strong adsorbents, theuse of 4A indicating (cobalt-treated) m
19、olecular sieves as a desiccatingmedium is suggested. Regenerate the desiccant at 220 to 260C, asrequired.8. Calibration and Standardization8.1 Before use, the test apparatus should be set to zero andcalibrated with any commercially available force gage withmarked graduations of no more than12 lbf (2
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