Competitive adsorption of gas mixtures in fractal slit nanopores

Abstract eng:
Fractal slit nanopore is a ubiquitous pore structure in porous media such as shale. Gas in rough pores exhibits different adsorption Mimics from that in smooth pores. In this study, graphite slit nanopores with different roughness (quantified by fractal dimension) were created using random midpoint displacement method to model the most common pore structure in shale, and the competitive adsorption of CH4/N2 and CH4/CO2 mixtures was investigated through grand canonical Monte Carlo simulation, which elucidated the effects of roughness on the selective adsorption capacity of the nanopores. The result of this study is helpful not only for understanding the microscopic mechanism of competitive adsorption of gas mixtures in rough nanopores with fractal characteristics but also for estimating the separation efficiency of methane from other components of shale gas.

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