Active Sites Decorated Nonpolar Pore‐Based MOF for One‐step Acquisition of C₂H₄ and Recovery of C₃H₆

Abstract

Herein, a 2‐fold interpenetrated metal‐organic framework (MOF) Zn‐BPZ‐TATB with accessible N/O active sites in nonpolar pore surfaces was reported for one‐step C2H4 purification from C2H6 or C3H6 mixtures as well as recovery of C3H6 from C2H6/C3H6/C2H4 mixtures. The MOF exhibits the favorable C2H6 and C3H6 uptakes (> 100 cm3 g‐1 at 298 K under 100 kPa) as well as selective adsorption of C2H6 and C3H6 over C2H4. The C3H6‐ and C2H6‐selective feature were investigated detailedly by experimental tests as well as sorption kinetic studyies. Molecular modelling revealed the multiple interactions between C3H6 or C2H6 molecules and methyl groups as well as triazine rings in pores. Zn‐BPZ‐TATB not only can directly generate 323.4 L kg‐1 and 15.4 L kg‐1 of high‐purity (≥99.9%) C2H4 from C3H6/C2H4 and C2H6/C2H4 mixtures, but also provide a large high‐purity (≥99.5%) C3H6 recovery capacity of 60.1 L kg‐1 from C3H6/C2H4 mixtures. More importantly, the high‐purity C3H6 (≥99.5%) and C2H4 (≥99.9%) with the productivities of 38.2 and 12.7 L kg‐1 can be simultaneously obtained from C2H6/C3H6/C2H4 mixtures through a single adsorption/desorption cycle.