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ASTM D4222-03(2015)e1

Current Reaffirmation

Standard Test Method for Determination of Nitrogen Adsorption and Desorption Isotherms of Catalysts By Static Volumetric Measurements

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1.1 This test method covers the determination of nitrogen adsorption and desorption isotherms of catalysts and catalyst carriers at the boiling point of liquid nitrogen.2 A static volumetric measuring system is used to obtain sufficient equilibrium adsorption points on each branch of the isotherm to adequately define the adsorption and desorption branches of the isotherm. Thirty points evenly spread over the isotherm is considered to be the minimum number of points that will adequately define the isotherm.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 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.


5.1 The test method has two main functions: first, it provides data useful for establishing the pore size distribution of catalyst materials, which in turn may influence their performance; and second, it serves as a laboratory test which may be used to study porosity changes that may occur during the manufacture and evaluation of catalysts.

SDO ASTM: ASTM International
Document Number D4222
Publication Date April 1, 2015
Language en - English
Page Count 6
Revision Level 03(2015)e1
Supercedes
Committee D32.01
Publish Date Document Id Type View
Oct. 1, 2020 D4222-20 Revision
Oct. 1, 2003 D4222-03 Revision
March 10, 1998 D4222-98 Revision
April 1, 2015 D4222-03R15E01 Reaffirmation
April 1, 2008 D4222-03R08 Reaffirmation