Influence of the external surface area of small crystallite zeolites on the micropore volume determination

Citation
Ef. Sousa-aguiar et al., Influence of the external surface area of small crystallite zeolites on the micropore volume determination, MICROP M M, 25(1-3), 1998, pp. 185-192
Citations number
10
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
MICROPOROUS AND MESOPOROUS MATERIALS
ISSN journal
13871811 → ACNP
Volume
25
Issue
1-3
Year of publication
1998
Pages
185 - 192
Database
ISI
SICI code
1387-1811(199812)25:1-3<185:IOTESA>2.0.ZU;2-F
Abstract
The micropore volumes of zeolites displaying different external surface are as were determined with the help of two classical methods: the Dubinin-Radu shkevich (DR) and t-plot. The results were compared with a new approach, in which adsorption isotherms are decomposed into two adsorption areas: one c orresponding to the micropore filling and described by the DR equation, and the other ascribed to adsorption on the external surface and ruled by the classical BET equation. The results indicate that the proposed model fits t he experimental data very well. Furthermore, the DR-plot seems to overestim ate micropore volume, whereas the t-plot, in the range 6<t<9 Angstrom, unde restimates it. (C) 1998 Elsevier Science B.V. All rights reserved.