Determining pore-size distribution of activated carbons by liquid chromatography

✍ Scribed by Gerald Bunke; David Gelbin

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 617 KB
• Volume: 40
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(85)87025-1

✦ Synopsis

The pore-size distribution of activated carbons in the range of openings below 13 nm has been determined by liquid chromatography (LC). The initial stage of work involved the choice of a suitable solvent and of working conditions ensuring operation within the region of Henry's law. Dimethyl fo rmamide proved to be the most suitable carrier among four liquids tested. Tracers spanned a molecular-weight range of 78-1000 in two homologous series, the alkylated benzenes and the polypropylene glycols. Adsorption equilibrium constants for each tracer were calibrated on five different carbons by comparison with results of benzene isotherms interpreted by the Dubinin-Raduskevic (DR) method, of nitrogen isotherms (BET), of pycnometry and mercury porosimetry. With the standardized Henry constants, a simple set of equations is solved to determine pore-size distribution solely on the basis of LC measurements.