Study of intracrystalline diffusion in zeolites 6. Comparison of the results obtained by the method of densitometry of light and the adsorption method

Autor:	A. M. Voloshchuk, V. N. Chechevichkin, V. A. Gorlov, T. A. Moskovskaya, L. S. Reifman, A. A. Yurkevich
Rok vydání:	1990
Předmět:	chemistry.chemical_compound Adsorption Chromatography chemistry Adsorption kinetics Diffusion Heat exchanger Analytical chemistry General Chemistry Zeolite Benzene Densitometry Order of magnitude
Zdroj:	Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 39:1097-1100
ISSN:	1573-9171 0568-5230
DOI:	10.1007/bf00962362
Popis:	The use of the method of densitometry of light passing through a layer of zeolite crystals permits determining the limiting stage of diffusion during adsorption by zeolites. Diffusion in transport pores and external heat exchange play the basic role in adsorption of benzene by NaX zeolite, while diffusion in crystals is the determining mechanism of transport in adsorption of water by NaA and NaX zeolites. The diffusion coefficients of water in NaX zeolite have an order of magnitude of 10−17 m2/sec and increase with an increase in the degree of filling. An explanation for the anomalous behavior of the kinetic adsorption curve for brief times of adsorption of water by zeolite is proposed.
Databáze:	OpenAIRE
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