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2010-05-23 - Colloque/Présentation - poster - Anglais - 1 page(s)

Billemont Pierre, Severino Antoni, De Weireld Guy , "Adsorption of CO2 and CH4 on activated carbon : a statistical thermodynamics approach to predict multicomponent gas sorption equilibria from pure gas data" in 10th International Conference on Fundamentals of Adsorption, P25-63, 346, Awaji, Hyogo, Japon, 2010

  • Codes CREF : Physique des surfaces (DI1265), Chimie (DI1300)
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Abstract(s) :

(Anglais) Adsorption of carbon dioxide and methane on dry and wet activated carbon: a statistical thermodynamics approach to predict multicomponent gas adsorption equilibria from pure gas data. Pierre Billemont,*,a Antoni Severino,a Guy De Weireld a a Department of Thermodynamics, Faculty of Engineering, UMONS – University of Mons, 31 Boulevard Dolez, 7000 Mons, Belgium E-mail : pierre.billemont@umons.ac.be Carbon dioxide capture and subsequent storage (CCS) in geological formations is a favourable option on the short to medium term to reduce global CO2 emissions. The costs for CO2 storage depend largely on capture costs, the distance between the geological formation and the CO2 source and on the energy needed for gas compression. Simultaneous production of fossil fuels by CO2 injection may alleviate the costs associated with the storage. In this respect, one attractive option is CO2 Enhanced Coalbed Methane (CO2-ECBM) recovery. It can lower injection costs and, hence increase the commercial benefits. In order to model the storage of CO2 in coal seams, it’s necessary to have a good knowledge of thermodynamics properties of the system CO2-methane-natural coal with or without presence of water. In a first approach, we decided to work with activated carbon in order to simplify the problem. This work is focused on the prediction of multicomponent gas adsorption equilibria for highly non-ideal systems with the aim of improving the modelling of CO2-ECBM recovery. Our method is based on the adsorption integral equation (AIE). Local adsorption model is obtained using a statistical thermodynamics approach leading to a generalized expression of adsorption isotherms for pure gases on homogeneous surfaces. The non-ideality of both gas and adsorbed phases are taken into account using the Redlich-Kwong equations of state (EOS) which is adapted for two-dimension phases. Classic Lorentz-Berthelot mixing rules allow an extention of this model to gas mixtures adsorption equilibria1. Sorbent heterogeneity is taken into account by the pore size distribution which is determined from pure adsorption data by regularization. Pure CO2, methane and water adsorption isotherms have been determined on an activated carbon at 45°C up to 15 MPa for CO2 and methane and up to saturated vapour pressure for water. The model has been applied and predictions of the mixtures CO2-methane, CO2-water and methane-water have been performed. Experimental measurements of these different mixtures have been achieved with a built-house gravimetric apparatus and with a built-house volumetric apparatus respectively up to 15 MPa and 3 MPa in order to confront the predictions with experimental data. A good agreement between experimental data and predicted ones has been pointed out. 1. Belmabkhout, Y.; Frere, M.; De Weireld, G., Adsorption equilibria of single gas and gas mixture on homogeneous surfaces: a unified approach based on statistical thermodynamics developments. Part II: extension to gas mixture adsorption. Mol Simulat 32, (7), 503-511 (2006).