A Robust Cage-Based Metal–Organic Framework\nShowing Ultrahigh SO₂ Uptake for Efficient Removal of Trace\nSO₂ from SO₂/CO₂ and SO₂/CO₂/N₂ Mixtures

Abstract

Removal of trace SO₂ from\nan SO₂-containing\nproduct is now receiving increasing attention. However, designing\na robust porous adsorbent with high SO₂ adsorption capacity\nand good SO₂/CO₂ selectivity, as well as validity\nunder humid conditions, is still a challenging task. Herein, we report\na porous cage-based metal–organic framework, namely ECUT-111,\nwhich contains two distinct cages with apertures of 5.4 and 10.2 Å,\nrespectively, and shows high a BET of up to 1493 m²/g and\na pore volume of 0.629 cm³/g. Impressively, ECUT-111 enables\nan ultrahigh SO₂ uptake of up to 11.56 mmol/g, exceeding\nmost reported top-performing adsorbents for such a use. More importantly,\ncomplete separation of trace SO₂ from SO₂/CO₂ and SO₂/CO₂/N₂ mixtures,\nespecially under humid conditions, and excellent recycle use were\nobserved for ECUT-111, suggesting its superior application in desulfurization\nof SO₂-containing products.