A Robust Cage-Based Metal-Organic Framework Showing Ultrahigh SO Uptake for Efficient Removal of Trace SO from SO/CO and SO/CO/N Mixtures.

Removal of trace SO from an SO-containing product is now receiving increasing attention. However, designing a robust porous adsorbent with high SO adsorption capacity and good SO/CO 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/g and a pore volume of 0.629 cm/g. Impressively, ECUT-111 enables an ultrahigh SO 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 from SO/CO and SO/CO/N mixtures, especially under humid conditions, and excellent recycle use were observed for ECUT-111, suggesting its superior application in desulfurization of SO-containing products.