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E-Journal of Chemistry
Volume 9, Issue 2, Pages 650-658
http://dx.doi.org/10.1155/2012/976275

Determination of Energy Characteristic and Microporous Volume by Immersion Calorimetry in Carbon Monoliths

1Departamento de Química, Facultad de Ciencias, Grupo de Investigación en Sólidos Porososy Calorimetría, Universidad de los Andes, Carrera 1a N° 18a-10, Bogotá, Colombia
2Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Avenida Carrera 30 N° 45-03 Bogotá, Colombia

Received 13 May 2011; Revised 14 May 2011; Accepted 5 June 2011

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Activated carbon monoliths disc and honeycomb type were prepared by chemical activation of coconut shell with zinc chloride at different concentrations, without using a binder. The structures were characterized by N2 adsorption at 77 K and immersion calorimetry into benzene. The experimental results showed that the activation with zinc chloride produces a wide microporous development, with micropore volume between 0,38 and 0,79 cm3g-1, apparent BET surface area between 725 and 1523 m2g-1 and immersion enthalpy between 73,5 and 164,2 Jg-1. We compared the experimental enthalpy with calculated enthalpy by equation Stoeckli-Kraehenbuehl finding a data dispersion from which can infer that the structures are not purely microporous; this fact is ratified with similar behavior that the evidence t the product EoWo.