1、Designation:D676122Standard Test Method forDetermination of the Total Pore Volume of Catalysts andCatalyst Carriers1This standard is issued under the fixed designation D6761;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 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 totalpore volume of catalysts and catalyst carriers,that is,thevolume of
3、pores having pore diameter between approximately14 m and 0.4 nm(4).1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.3 WarningMercury has been designated by many regu-latory agencies as a hazardous material that can caus
4、e centralnervous system,kidney,and liver damage.Mercury,or itsvapor,may be hazardous to health and corrosive to materials.Caution should be taken when handling mercury and mercurycontaining products.See the applicable product MaterialSafety Data Sheet(MSDS)for details and EPAs websitehttp:/www.epa.g
5、ov/mercury/faq.htmfor additional informa-tion.Users should be aware that selling mercury or mercurycontaining products,or both,into your state or country may beprohibited by law.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibi
6、lity 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.Specific hazard statements are given in Section 8.Warningstatements are given in 10.1.4,10.1.7,and 10.1.11.1.5 This internatio
7、nal 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
8、.2.Referenced Documents2.1 ASTM Standards:2D3766 Terminology Relating to Catalysts 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
9、of a Test Method3.Terminology3.1 Definitions:3.1.1 particle volumethe volume of a particle includingpores into which mercury cannot penetrate at ambient pressure(smaller than approximately 14 m diameter pore mouth).3.1.2 true volumethe volume of a particle,includingpores,into which helium cannot pen
10、etrate(smaller than aboutapproximately 0.4 nm(4)diameter pore mouth).3.1.3 Other definitions and terms used in this test methodare defined in Terminology D3766.3.2 Symbols for Mercury Intrusion:W=mass of sampleWc=mass of sealed empty sample cellWC=mass of sealed sample cell filled with mercuryWs=mas
11、s of sealed sample cell with sampleWS=mass of sealed sample cell with sample filled withmercuryVHgC=volume of mercury in empty sample cell(volume ofsample cell)VHgS=volume of mercury in cell with sampleVSHg=sample volume,cm3VHg=specific sample volumeVP=particle volumeWb=weight mercury reservoir afte
12、r filling burette withsampleWb=mass of mercury reservoir after filling burette with-out sample1This 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 April 1,2022.
13、Published April 2022.Originallyapproved in 2002.Last previous edition approved in 2017 as D6761 17.DOI:10.1520/D6761-22.2For 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 t
14、he 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 D
15、ecision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.3 Symbols for Helium Pycnometry:VC=volume of sample cell and associated tubing,cm3VR=reference volume,cm3VSHe=sample volu
16、me,cm3VCyl=volume of calibration cylinder,cm3VSTD=volume of calibration standard,cm3VHe=specific sample volumeP1=pressure in empty sample cell,psig or pascalsP2=pressure in empty sample cell,after the referencevolume has been included in the system,psig orpascalsP1=pressure in sample cell with sample or calibrationstandard before the reference volume has beenincluded in the system,psig or pascalsP2=pressure with sample or calibration standard in thesample cell,after the reference volume has been
