Methane and Carbon Dioxide Adsorption on Illite

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• 作者：Junfang Zhang ; Michael B. Clennell ; Keyu Liu ; Marina Pervukhina ; Guohui Chen ; David N. Dewhurst
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：December 15, 2016
• 年：2016
• 卷：30
• 期：12
• 页码：10643-10652
• 全文大小：582K
• ISSN：1520-5029

文摘

The adsorption of CH₄ and CO₂ onto illitic clay was investigated at the temperatures 298, 313, 328, 358, and 423 K (25, 40, 55, 85, and 150 °C) over a range of pressures up to 50 MPa using grand canonical Monte Carlo (GCMC) simulations. Our simulation results showed spontaneous and exothermic adsorption behavior of illite for CH₄ and CO₂ with enthalpy changes of −3.50 kJ/mol and −25.09 kJ/mol, respectively. Our results indicated that the interlayer counter cations (K⁺) play an important role in CO₂ adsorption. Methane adsorption is mainly affected by the clay surface layers rather than the interlayer counter cations. The density and volume of CH₄ and CO₂ in their adsorbed phase at saturation were extrapolated from the linear portion of the excess adsorption isotherm. The resulting values were compared with available experimental data, and possible factors causing inconsistency were described. We discussed some issues associated with the Langmuir fit to experimental excess adsorption data in the case of low pressures. Our findings may provide some insights into gas adsorption behavior in illite-bearing shales.