Kinetic‐Sieving of Carbon Dioxide from Acetylene through a Novel Sulfonic Ultramicroporous Material
Jiyu Cui, Zhensong Qiu, Lifeng Yang, Zhaoqiang Zhang, Xili Cui, Huabin Xing
Abstract
Abstract The engineering and tailoring of porous materials to realize the precise discrimination of CO 2 and C 2 H 2 , with almost identical kinetic diameters, is a challenging task. We herein report the first example of the kinetic‐sieving of relatively larger molecule of C 2 H 2 from CO 2 by a novel sulfonic anion‐pillared hybrid ultramicroporous materials of ZU‐610a. Specifically, ZU‐610 constructed from copper(II), isonicotinic acid and 1,2‐ethanedisulfonic acid is synthesized and shows the preferential affinity for C 2 H 2 over CO 2 . After the post‐synthetic heat treatment of ZU‐610, ZU‐610a with a contracted aperture is obtained. Interestingly, the C 2 H 2 ‐selctive ZU‐610 was reversed to the CO 2 ‐selective ZU‐610a. High purity C 2 H 2 (>99.5 %) could be directly obtained from the dynamic breakthrough experiments on an equimolar C 2 H 2 /CO 2 mixture at 298 K. This study provides guidance for the design of adsorbents aimed at separation systems with similar kinetic diameter.