Kinetics of n-butane adsorption on various particle sizes of silica gel by gas-solid chromatography

Autor:	P. E. Eberly Jun.
Rok vydání:	2007
Předmět:	Packed bed chemistry.chemical_compound Adsorption Chemistry Silica gel Kinetics Analytical chemistry Particle Butane Particle size Porosity
Zdroj:	Journal of Applied Chemistry. 14:330-337
ISSN:	1934-998X 0021-8871
DOI:	10.1002/jctb.5010140804
Popis:	The techniques of gas-solid chromatography have been widely used for measuring heats of adsorption. It is theoretically possible to derive information concerning the adsorption kinetics from the same chromatographic data and the present report deals with this application of chromatography. The process of adsorption in a packed column of adsorbent is visualised as resulting from molecular collisions with the external surface of the porous adsorbent particles. Only a fraction α of the total collisions results in adsorption. The adsorbed molecules, on the average, spend a finite time, θ, in the adsorbent particle. For n-butane on silica gel at 60°, θ is proportional to the 3/2 power of the particle diameter and varies from 1·8 to 13·8 sec, for samples having median diameters of 0·192 to 0·712 mm., respectively. For a given particle size, θ is proportional to eΔH/RT (ΔH is the heat of adsorption) and amounts to about 8 kcal./mole.
Databáze:	OpenAIRE
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