Determination of the specific surface area of solids by gas adsorption — BET method (ISO 9277:2022)
| Standard Number | NBN ISO 9277:2023 |
|---|---|
| Organization |
Bureau for Standardisation
|
| Level | National |
| Category | Specification |
| Status |
|
ABSTRACT
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.