Abstract

TABORDA-ACEVEDO, Esteban Alberto; JURADO, William J.  and  CORTES, Farid B.. Effect of the temperature in adsorption phenomena of water onto Sub-Bituminous coal. Bol. cienc. tierra [online]. 2016, n.39, pp.57-64. ISSN 0120-3630.  https://doi.org/10.15446/rbct.n39.54127.

The presence of water in coal presents a technological challenge for its industrial use in energetic processes. Therefore, this study aims to study the temperature effect on the water adsorption onto coals at 21, 30, 40 and 50°C. A Colombian bituminous coal was used as sample. The coal was characterized by nitrogen adsorption at 77 K (S_BET), Scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, elemental analysis (C-H-N elemental). The results showed that the water uptake increased as the vapor pressure increased. The Talu and Meunier model [1] was used to fit the adsorption isotherms, and the mean square root error (MSRE%) was lower than 10%. Additionally, the Gibbs free energy was found to have negative values, which corroborates the spontaneous adsorption process.

Keywords : Adsorption; Coal; Isotherm; Water.

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