Resumo

AGUILAR ARMENTA, Gelacio  e  DIAZ JIMENEZ, Lourdes. Estudio de la microporosidad de carbones activados por adsorción de benceno, ciclohexano y nitrógeno. Rev. Soc. Quím. Méx [online]. 2000, vol.44, n.4, pp.257-265. ISSN 0583-7693.

The results of the porosity study of three samples of commercial activated carbons, from adsorption isotherms of benzene (295 K) and N₂ (75.5 K), using a high volumetric system, which was made of Pyrex glass, are presented. Special care was taken in the measurement of the isotherms in the range of low relative pressures (10⁻⁶) in order to characterize the microporosity of these carbons by different approaches: Dubinin-Radushkevich (D-R), α-plots, and Plavnick. 60% of the adsorbed benzene corresponds to irreversible adsorption, which can only be desorbed at T > 373 K in a high vacuum. It was established that the three samples are basically microporous, with a strongly pronounced structural heterogeneity.

Palavras-chave : activated carbons; micropore; adsorption; benzene; and nitrogen.