Issue 8, 2024

Trace SO2 capture within the engineered pore space using a highly stable SnF62−-pillared MOF

Abstract

Developing reliable solid sorbents for efficient capture and removal of trace sulfur dioxide (SO2) under ambient conditions is critical for industrial desulfurization operations, but poses a great challenge. Herein, we focus on SNFSIX-Cu-TPA, a highly stable fluorinated MOF that utilizes SnF62− as pillars, for effectively capturing SO2 at extremely low pressures. The exceptional affinity of SNFSIX-Cu-TPA towards SO2 over CO2 and N2 was demonstrated through single-component isotherms and corroborated by computational simulations. At 298 K and 0.002 bar, this material displays a remarkable gas uptake of 2.22 mmol g−1. Among various anion fluorinated MOFs, SNFSIX-Cu-TPA shows the highest SO2/MF62− of 1.39 mmol mmol−1 and exhibits a low Qst of 58.81 kJ mol−1. Additionally, SNFSIX-Cu-TPA displays excellent potential for SO2/CO2 separation, as evidenced by its ideal adsorbed solution theory (IAST) selectivity of 148 at a molar fraction of SO2 of 0.01. Dynamic breakthrough curves were obtained to reveal the effective removal of trace SO2 from simulated flue gas (SO2/CO2/N2; v/v/v 0.2/10/89.8) with a high dynamic capacity of up to 1.52 mmol g−1. Furthermore, in situ TGA demonstrated the efficient and reversible capture of 500 ppm SO2 over 20 adsorption–desorption tests. This durable material presents a rare combination of exceptional SO2 capturing performance, good adsorption selectivity, and mild regeneration, thus making it a good candidate for a realistic desulfurization process.

Graphical abstract: Trace SO2 capture within the engineered pore space using a highly stable SnF62−-pillared MOF

Supplementary files

Article information

Article type
Communication
Submitted
25 Dec. 2023
Accepted
12 Febr. 2024
First published
19 Febr. 2024

Mater. Horiz., 2024,11, 1889-1898

Trace SO2 capture within the engineered pore space using a highly stable SnF62−-pillared MOF

W. Li, C. Cheng, G. Gao, H. Xu, W. Huang, Z. Qu and N. Yan, Mater. Horiz., 2024, 11, 1889 DOI: 10.1039/D3MH02222F

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