Journal
8TH TRONDHEIM CONFERENCE ON CO2 CAPTURE, TRANSPORT AND STORAGE
Volume 86, Issue -, Pages 144-149Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.egypro.2016.01.015
Keywords
CO2/CH4 separation; carbon mesopores; molecular dynamics; simulations
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The effect of surface charged defects in carbon mesoporous materials on adsorption selectivity for a CO2/CH4 gas mixture relevant to natural gas was studied by means of classical molecular dynamics (MD) simulation. The mole fraction of CO2 was 0.1, T = 300K and the partial pressure of CO2 was up to 40 bars. A graphite slit pore of 3.0 nm was taken as a model for mesoporous carbon. The localized charged defects within an electroneutral pore surface were found to increase the CO2/CH4 separation selectivity. In addition, such surface charges interact with CO2 molecules only. The selectivity reduces with increasing pressures. Our model with a defect charge of 0.2 electron/atom can reproduce the selectivity CO2/CH4 of the experimental data reported in the literature. A perfect charge graphite model underestimates the adsorption selectivity of CO2/CH4. The results show that a very high selectivity around 25 can be achieved with a charged defect of 0.45 electron/atom. This suggests that controlling the charged defects on surface of carbon mesoporous can be used to enhance the CO2/CH4 separation for natural gas. (C) 2016 The Authors. Published by Elsevier Ltd.
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