ASTM D4222-03
Historical Standard: ASTM D4222-03 Standard Test Method for Determination of Nitrogen Adsorption and Desorption Isotherms of Catalysts By Static Volumetric Measurements
SUPERSEDED (see Active link, below)
ASTM D4222
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. 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 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D3663 Test Method for Surface Area of Catalysts and Catalyst Carriers
D3766 Terminology Relating to Catalysts and Catalysis
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
Keywords
adsorption; catalysts; desorption; isotherms; nitrogen gas; volumetric; Catalysts/catalyst carriers; Dead-space analysis; Desorption isotherms; Isotherm techniques; Nitrogen adsorption; Performance--petroleum products/applications; Pore distribution; Porosity; Static volumetric measurement; Volumetric measurement--petroleum products;
ICS Code
ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity); 71.040.30 (Chemical reagents)
DOI: 10.1520/D4222-03
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