Superhydrophobic zeolitic imidazolate framework with suitable SOD cage for effective CH4/N2 adsorptive separation in humid environments
Various adsorbents for CH 4 /N 2 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 CH 4 /N 2 separation. The CH 4 adsorption capacity and CH 4 /N 2 selectivity were as high as 45.29 cm 3 /cm 3 and 6.3 (298 K, 1 bar), respectively, which results from the suitable SOD cage size (0.80 nm). The H 2 O adsorption was lower than 6.3 cm 3 /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 CH 4 /N 2 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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