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About This Item
Full Description
1.1 This practice covers the calculation of pore size distributions for catalysts and catalyst carriers from nitrogen desorption isotherms. The computational procedure is particularly useful for determining how the pore volume is distributed in catalyst samples containing pores whose sizes range from approximately 1.5 to 100 nm (15 to 1000 ) in radius. It should be used with caution when applied to isotherms for samples containing pores both within this size range and pores larger than 100 nm (1000 ) in radius. In such instances the isotherms rise steeply near P/P
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Document History
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ASTM D4641-17
Standard Practice for Calculation of Pore Size Distributions of Catalysts and Catalyst Carriers from Nitrogen Desorption Isotherms- Most Recent
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ASTM D4641-12
Standard Practice for Calculation of Pore Size Distributions of Catalysts and Catalyst Carriers from Nitrogen Desorption Isotherms- Historical Version
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ASTM D4641-94(2006)
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Standard Practice for Calculation of Pore Size Distributions of Catalysts from Nitrogen Desorption Isotherms- Historical Version
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ASTM D4641-94(1999)e1
Standard Practice for Calculation of Pore Size Distributions of Catalysts from Nitrogen Desorption Isotherms- Historical Version