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Standard Test Method for Determination of Nitrogen Adsorption and Desorption Isotherms of Catalysts and Catalyst Carriers by Static Volumetric Measurements
Automaticky přeložený název:
Standardní zkušební metoda pro stanovení dusíku Adsorpce a desorpce isotherms katalyzátorů a nosičů katalyzátorů statickým Objemové měření
NORMA vydána dne 1.4.2008
Označení normy: ASTM D4222-03(2008)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.4.2008
Kód zboží: NS-26482
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
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 Number Code 17.060 (Measurement of volume, mass, density, viscosity), 71.040.30 (Chemical reagents)
Significance and Use | ||||||||||
The test method has two main functions: first, it provides data useful for establishing the pore size distribution of catalyst materials, which in turn may influence their performance; and second, it serves as a laboratory test which may be used to study porosity changes that may occur during the manufacture and evaluation of catalysts. |
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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 given 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. |
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2. Referenced Documents | ||||||||||
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