| 초록 |
C2H6-selective adsorbents for efficient C2H6/C2H4 separation have been extensively investigated focusing on the porous materials with organic-based framework, such as metal-organic frameworks (MOFs) and hydrogen-bonded frameworks (HOFs). However, most of these materials have relatively poor stability and low packing density, restricting industrial application. Herein, we reported C2H6-selective pure silica zeolite adsorbents with high stability and packing density. Systematic research revealed that minimizing silanol defects and aluminum sites significantly suppresses the interactions between π electrons in C2H4 and the silanol or cation in zeolites, resulting in olefin-phobic adsorption behavior. As a result, the defect-free pure silica zeolites with BEA, MFI, and CHA framework structure showed the high C2H6/C2H4 selectivity (2.20, 1.98, and 2.09, respectively). Especially, in the case of defect-free pure silica BEA zeolite, a mixture of C2H6/C2H4 (1/1 v/v) could be separated into the polymer-degree ethylene (>99.95%) with high ethylene productivity (22.98 LSTP L-1) at 298 K, which is outstanding performance compared with state-of-the-art adsorbents. |
