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 12 2023
Accepted
12 2 2024
First published
19 2 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements