درباره ما
ISO 9277
Determination of the specific surface area of solids by gas adsorption — BET method - Second Edition
Organization:
ISO - International Organization for Standardization
Year: 2010
Abstract: This International Standard specifies the determination of the overall (see Note) specific external and internal surface area of disperse (e.g. nano-powders) or porous solids by measuring the amount of physically adsorbed gas according to the Brunauer, Emmett and Teller (BET) method (see Reference [1]). It takes account of the International Union for Pure and Applied Chemistry (IUPAC) recommendations of 1984 and 1994 (see References [7][8]).
NOTE For solids exhibiting a chemically heterogeneous surface, e.g. metal-carrying catalysts, the BET method gives the overall surface area, whereas the metallic portion of the surface area can be measured by chemisorption methods.
The BET method is applicable only to adsorption isotherms of type II (disperse, nonporous or macroporous solids) and type IV (mesoporous solids, pore diameter between 2 nm and 50 nm). Inaccessible pores are not detected. The BET method cannot reliably be applied to solids which absorb the measuring gas.
A strategy for specific surface area determination of microporous materials (type I isotherms) is described in Annex C.
NOTE For solids exhibiting a chemically heterogeneous surface, e.g. metal-carrying catalysts, the BET method gives the overall surface area, whereas the metallic portion of the surface area can be measured by chemisorption methods.
The BET method is applicable only to adsorption isotherms of type II (disperse, nonporous or macroporous solids) and type IV (mesoporous solids, pore diameter between 2 nm and 50 nm). Inaccessible pores are not detected. The BET method cannot reliably be applied to solids which absorb the measuring gas.
A strategy for specific surface area determination of microporous materials (type I isotherms) is described in Annex C.
Collections
:
Show full item record
| contributor author | ISO - International Organization for Standardization | |
| date accessioned | 2017-09-04T18:45:29Z | |
| date available | 2017-09-04T18:45:29Z | |
| date copyright | 2010.09.01 | |
| date issued | 2010 | |
| identifier other | KHHVXCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;query=authoF2377D8669B749A/handle/yse/226874 | |
| description abstract | This International Standard specifies the determination of the overall (see Note) specific external and internal surface area of disperse (e.g. nano-powders) or porous solids by measuring the amount of physically adsorbed gas according to the Brunauer, Emmett and Teller (BET) method (see Reference [1]). It takes account of the International Union for Pure and Applied Chemistry (IUPAC) recommendations of 1984 and 1994 (see References [7][8]). NOTE For solids exhibiting a chemically heterogeneous surface, e.g. metal-carrying catalysts, the BET method gives the overall surface area, whereas the metallic portion of the surface area can be measured by chemisorption methods. The BET method is applicable only to adsorption isotherms of type II (disperse, nonporous or macroporous solids) and type IV (mesoporous solids, pore diameter between 2 nm and 50 nm). Inaccessible pores are not detected. The BET method cannot reliably be applied to solids which absorb the measuring gas. A strategy for specific surface area determination of microporous materials (type I isotherms) is described in Annex C. | |
| language | English | |
| title | ISO 9277 | num |
| title | Determination of the specific surface area of solids by gas adsorption — BET method - Second Edition | en |
| type | standard | |
| page | 30 | |
| status | Active | |
| tree | ISO - International Organization for Standardization:;2010 | |
| contenttype | fulltext |