Propane-Trapping Ultramicroporous Metal-Organic Framework in the Low-Pressure Area toward the Purification of Propylene.

The propane (CH)-trapping adsorption behavior is considered as a potential performance to directly produce high-purity propylene (CH). Herein, we report an ultramicroporous Mn-based metal-organic framework () with a reverse CH-selective behavior in the low-pressure area. The pore structure of this material possesses more electronegative aromatic benzene rings for the stronger binding affinity to CH, and the material shows outstanding reverse ideal adsorbed solution theory (IAST) selectivity values. Single-component sorption isotherms preliminarily show the reverse adsorption behavior in the low-pressure part, and the moderate heat of adsorption further confirms this performance and exhibits less energy consumption for regeneration. In addition, the purification effect for the CH/CH mixture is evaluated by the IAST selectivity and transient breakthrough curves, and the GCMC calculation results reveal that the fascinating CH-trapping behavior mainly depends on the multiple C-H···π interactions. Moreover, because CH is the desired target product, the interesting CH-selective adsorption behavior of may provide its potential for one-step purification of CH, and this work can provide the method of developing CH-selective materials for the purification of CH.