‡These authors contributed equally.
Abstract
Due to its toxicity and corrosiveness, it is of enormous significance to
efficiently capture and recover sulfur dioxide (SO2)
from flue gas and natural gas. Herein, a new type
of IL/MIL-0.7 composite was
precisely designed to meet this challenge, which exhibits a high
adsorption capacity for SO2 (13.17
mmol·g-1) at 298 K and 1 bar while excludes almost
completely carbon dioxide (CO2) (0.27
mmol·g-1) and nitrogen (N2) (0.07
mmol·g-1). The high IAST selectivity (at least 11925)
of IL/MIL-0.7 for SO2/CO2 can be
achieved within the whole test pressure range. In addition, the
breakthrough experiment also confirmed the excellent performance of the
composite for deep removal of 2000 ppm SO2. Furthermore,
the IL/MIL-0.7 composites can maintain excellent performance after four
adsorption and desorption circulations and the thermostability can up to
~450 K. Therefore, this stable IL/MOF composite has the
potential application as an effective adsorbent for SO2removal from flue gas and natural gas.
Keywords: ionic liquids, metal-organic frameworks,
molecular-sieving separation, SO2 capture