Abstract Efficient removal of trace acetylene (C 2 H 2 ) from ethylene (C 2 H 4 ) is crucial for polymer production, yet remains challenging for physisorption separation owing to their molecular similarity. Herein, we synthesized a series of LTL zeolites with varied Si/Al ratios via an acid co‐hydrolysis route. The optimal adsorbent LTL(2.3) with a low Si/Al ratio of 2.3 exhibited both high C 2 H 2 uptake (2.79 mmol g −1 ) and C 2 H 2 /C 2 H 4 (1/99, v / v ) selectivity of 26.84 at 1 bar and 298 K, as well as superior dynamic separation efficiency. Structural refinement based on high‐resolution powder X‐ray diffraction (PXRD) patterns illustrates that reducing Si/Al ratio provides more K + cation that serves as the strong C 2 H 2 binding sites, thereby promoting the C 2 H 2 /C 2 H 4 separation. Moreover, the optimal LTL zeolite also demonstrates favorable separation efficiency towards other gas mixtures (e.g., CO 2 /N 2 , CO 2 /CH 4 , C 2 H 4 /C 2 H 6 , and C 3 H 6 /C 3 H 8 ), showing the promising potential as a versatile adsorbent for gas separation and purification.
Liu et al. (Tue,) studied this question.