Adsorption and Diffusion Properties of CH4/CO2 in SiO2 Pores
Competitive adsorption and diffusion properties of CH4 and CO2 in SiO2 pores were studied in a simulated shale gas reservoir system. The results showed that there was strong competitive adsorption between CH4 and CO2, and the high pressure and low temperature could promote the adsorption of the two-component gases, but it was not conducive to their diffusion behavior, while CH4 was easier to diffuse than CO2. The adsorption of CH4 by the pore wall was dominated by non-bonded interactions, and the behavior of CO2 competing for adsorption sites could effectively inhibit the adsorption of CH4, and the inhibition effect was more significant as the percentage of CO2 increased. The adsorption behavior of both CO2 and CH4 in the pores was typical physical adsorption, and CO2 had a higher average isosteric heat of adsorption.
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