Standard Test Method for
Determination of Nitrogen Adsorption and Desorption
Isotherms of Catalysts and Catalyst Carriers by Static
Volumetric Measurements1
This standard is issued under the fixed designation D 4222; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
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
the volumetric measuring system is used to obtain sufficiently
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.
2. Referenced Documents
2.1 ASTM Standards: 3
D 3663 Test Method for Surface Area of Catalysts
D 3766 Terminology Relating to Catalysts and Catalysis
E 177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
E 456 Terminology Relating to Quality and Statistics
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
3. Terminology
3.1 Definitions—See Terminology D 3766.
3.2 Symbols:
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