ISO 9277:2022
Determination of the specific surface area of solids by gas adsorption — BET method
This document specifies the determination of the overall specific external and internal surface area of either disperse (e.g. nano-powders) or porous, solids by measuring the amount of physically adsorbed gas according to the method of Brunauer, Emmett and Teller method,[1] based on the 2015 International Union for Pure and Applied Chemistry (IUPAC) recommendations[3].
NOTE For solids exhibiting a chemically heterogeneous surface, for example, metal-carrying catalyst, the BET method gives the overall surface area, whereas the metallic portion of the surface area can be measured by chemisorption methods.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Procedure
6.1 Sample preparation
6.2 Experimental conditions
6.3 Measuring methods for the assessment of the amount of adsorbed gas
6.3.1 General
6.3.2 Static manometric (volumetric) method
6.3.3 Flow manometric (volumetric) method
6.3.4 Gravimetric method
6.3.5 Carrier gas method
6.3.6 Dynamic vapour sorption method
7 Evaluation of adsorption data
7.1 General
7.2 Multipoint determination
7.3 Single-point determination
8 Test report
9 Use of reference materials
Annex A (informative) Cross-sectional areas of some frequently used adsorptives
Annex B (informative) BET area of microporous materials
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Procedure
6.1 Sample preparation
6.2 Experimental conditions
6.3 Measuring methods for the assessment of the amount of adsorbed gas
6.3.1 General
6.3.2 Static manometric (volumetric) method
6.3.3 Flow manometric (volumetric) method
6.3.4 Gravimetric method
6.3.5 Carrier gas method
6.3.6 Dynamic vapour sorption method
7 Evaluation of adsorption data
7.1 General
7.2 Multipoint determination
7.3 Single-point determination
8 Test report
9 Use of reference materials
Annex A (informative) Cross-sectional areas of some frequently used adsorptives
Annex B (informative) BET area of microporous materials
Bibliography