Robust Anion-Pillared Ultramicroporous Material for C2H2/C2H4 Separation with High C2H2 Uptake and Selectivity

Removing trace amounts of C2H2 from C2H2/C2H4 mixtures for C2H4 purification is crucial but extremely challenging. In this work, by introducing SiF62– with specific recognition for C2H2, we constructed a robust adsorbent, FJI-W88, with a high C2H2 adsorption capacity and excellent C2H2/C2H4 separation selectivity. FJI-W88 not only exhibits ultrahigh C2H2 uptake at 0.01 bar (2.80 mmol g–1) but also shows exceptional C2H2/C2H4 (1/99) IAST selectivity of 698. Column breakthrough experiments further demonstrate that FJI-W88 can obtain C2H4 of high purity (≥99.95%) and high yield (230.0 mol kg–1) from C2H2/C2H4 (1/99) mixtures. Additionally, the C2H2/C2H4 (1/99) separation performance of FJI-W88 is basically unaffected under harsh conditions, such as high temperature and humidity.