Abstract

VARGAS, Diana P.; GIRALDO GUTIERREZ, Liliana  and  MORENO, Juan Carlos. IMMERSION ENTHALPY OF ACTIVATED CARBON MONOLITHS IN NONPOLAR SOLVENT. Rev.Colomb.Quim. [online]. 2010, vol.39, n.2, pp.247-255. ISSN 0120-2804.

This work presents the results obtained from immersion calorimetry in benzene on activated carbon monoliths disc and honeycomb type that were obtained from coconut shell using chemical activation with zinc chloride at different concentrations. The structures were characterized by adsorption N₂ at 77 K. The immersion enthalpies are between 73.5 and 164.2 Jg^-1. Using immersion enthalpy data the accessible area was calculated and compared with the area obtained by N₂ adsorption at 77K. A good correlation was found. In all the samples was observed an increase in the immersion enthalpy into benzene with the surface area. In addition there was a decrease in the energy characteristic with increasing pore volume.

Keywords : carbon monolith; chemistry activation; adsorption isotherm; immersion enthalpy; characteristic energy; accessible surface area.