A Robust Cage-Based Metal–Organic Framework Showing Ultrahigh SO<sub>2</sub> Uptake for Efficient Removal of Trace SO<sub>2</sub> from SO<sub>2</sub>/CO<sub>2</sub> and SO<sub>2</sub>/CO<sub>2</sub>/N<sub>2</sub> Mixtures
Meng Jia Yin, Xiao‐Hong Xiong, Xue Feng Feng, Wen Yuan Xu, Rajamani Krishna, Feng Luo
Abstract
Removal of trace SO 2 from an SO 2 -containing product is now receiving increasing attention. However, designing a robust porous adsorbent with high SO 2 adsorption capacity and good SO 2 /CO 2 selectivity, as well as validity under humid conditions, is still a challenging task. Herein, we report a porous cage-based metal–organic framework, namely ECUT-111, which contains two distinct cages with apertures of 5.4 and 10.2 Å, respectively, and shows high a BET of up to 1493 m 2 /g and a pore volume of 0.629 cm 3 /g. Impressively, ECUT-111 enables an ultrahigh SO 2 uptake of up to 11.56 mmol/g, exceeding most reported top-performing adsorbents for such a use. More importantly, complete separation of trace SO 2 from SO 2 /CO 2 and SO 2 /CO 2 /N 2 mixtures, especially under humid conditions, and excellent recycle use were observed for ECUT-111, suggesting its superior application in desulfurization of SO 2 -containing products.