Adsorption isotherms of pure C2H4 and C3H6 were measured on 11 adsorbents and at pressures up to 0.8 MPa using a volumetric method. The Brunauer–Emmett–Teller (BET) surface area of the adsorbents had a significant effect on adsorption capacities of both C2H4 and C3H6. The metal organic framework MIL-101 had the highest BET surface area and the highest adsorption capacity. For zeolite molecular sieves 5A, the C2H4 adsorption capacity was higher than that of C3H6, which is opposite to the results for most adsorbents. The isosteric heats of C3H6 on AC-1, 5A, MIL-101, ZIF-8, and SG-1 were higher than those of C2H4. The C3H6/C2H4 separation selectivities were calculated using the ideal solution theory, and the activated carbon AC-1 had the highest separation selectivity of 8.8.
The introduction of ionic liquids crystals (ILCs) into porous liquids (PLs) might be an effective way to overcome the problems associated with their processability, such as leakage, packaging, transportation, and long-term stability. Herein, a generalizable strategy to construct stimuli-responsive porous ionic liquids (SRPILs) based on the self-assembly of responsive ILCs and metal–organic frameworks (MOFs) has been demonstrated. The unique rapid reversible transition behaviors of the SRPILs induced by shearing and heating stimuli are verified. Furthermore, the SRPILs exhibited an approximately 3-fold increase in adsorption capacity for CO2 and C2H4 compared with that of the neat ILC solvent, confirming that the accessible porosity was retained in the SRPILs. Remarkably, the stimuli-responsiveness of the SRPILs can be demonstrated through changes in their phase, porosity, gas adsorption, and separation. Benefiting from their stimuli-responsive nature, SRPILs can be regarded as “smart porous liquids”, undoubtedly providing enormous inspiration for the development of new applications, including but not limited to gas capture/separation, sensing, catalysis, and electrochemical applications.
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