Abstract
AbstractVarious adsorbents for CH4/N2 separation were developed to enrich low‐concentration coal‐mine methane. Most are hydrophilic and cannot treat moist coal‐mine methane. We report for the first time a microporous zeolitic imidazolate framework Co(dcIm)2 (TUT‐100) with superhydrophobic properties for CH4/N2 separation. The CH4 adsorption capacity and CH4/N2 selectivity were as high as 45.29 cm3/cm3 and 6.3 (298 K, 1 bar), respectively, which results from the suitable SOD cage size (0.80 nm). The H2O adsorption was lower than 6.3 cm3/g at 298 K and near saturated pressure due to the hydrophobic group Cl. Breakthrough experiments were carried out to indicate the significant potential for CH4/N2 adsorption separation in a humid environment. The adsorption behavior of the gas mixture on the TUT‐100 was investigated by the Grand Canonical Monte Carlo method and coupled with the experimental data.
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