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  • BSI
    21/30419294 DC BS ISO 9277. Determination of the specific surface area of solids by gas adsorption. BET method.
    Edition: 2021
    $42.22
    / user per year

Description of 21/30419294 DC 2021

This International Standard specifies the determination of the overall1

1

For solids exhibiting a chemically heterogeneous surface, e.g. metal-carrying catalyst, the BET method gives the overall surface area, whereas the metallic portion of the surface area may be measured by chemisorption methods.

specific external and internal surface area of disperse (e.g. nano-powders) and/or porous solids by measuring the amount of physically adsorbed gas according to the method of Brunauer, Emmett and Teller (BET method) [1], based on the and 2015 International Union for Pure and Applied Chemistry (IUPAC) recommendations.

Gas adsorption allows for assessing surface area of nonporous materials and porous materials with accessible porosity (which depends on the chosen adsorptive). The BET method is applicable only to adsorption isotherms of type II (disperse, nonporous or macroporous solids) and type IV (mesoporous solids, there are however) (see Figure 1. Type II and Type IVa isotherms. However, in the case of Type IVb isotherms, caution is required since pore condensation may occur at quite low p/p0 (see 2015 IUPAC recommendations, ref. [3]. The BET method cannot reliably be applied to solids which absorb the measuring gas. A strategy for BET area determination of microporous materials (type I isotherms) is described in Annex C.



Standard Number21/30419294 DC
TitleBS ISO 9277. Determination of the specific surface area of solids by gas adsorption. BET method.
StatusDefinitive
Publication Date2021-05-27
Identical National Standard OfISO/DIS 9277
DescriptorsTesting conditions, Specimen preparation, Pressure, Adsorption, Area measurement, Porous materials, Solids, Gravimetric analysis, Mathematical calculations, Surfaces, Volumetric analysis, Dimensions, Adsorption indicators, Nitrogen, Control samples, Gases, Test equipment, Permeability measurement, Gas analysis, Particulate materials, Fineness tests, Fineness
ICS19.120 Particle size analysis. Sieving
CommitteeLBI/37
PublisherBSI
Pages25

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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