Highly Selective Mixed-Matrix Adsorbents Embedded with Anion-Pillared Microporous Materials and Poly(ionic liquid)s toward Sulfur Dioxide Capture

• Published in: Industrial & engineering chemistry research Vol. 62; no. 30; pp. 11957 - 11964
• Main Authors: Qian, Siheng, Hu, Jing, You, Rimin, Wang, Xiaobing, Yang, Lifeng, Xing, Huabin, Cui, Xili
• Format: Journal Article
• Language: English
• Published: American Chemical Society 02.08.2023
• Subjects: Separations
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.3c01551

SO2 emission has become an important issue due to its harmful impact on human health and the ecological environment. Adsorption separation is an energy-efficient technology to capture SO2, but it suffers from competitive adsorption of CO2. Here, we present a strategy to improve the separation performance of porous adsorbents through the fabrication of mixed-matrix adsorbents. By the introduction of a perm-selective polymer (P­(D­[VImC6]­Br)) as the matrix to enclose anion-pillared microporous materials (SIFSIX-3-Ni), CO2 molecules were selectively blocked, while the SO2 molecules could still permeate the polymer matrix and access the porous particles of SIFSIX-3-Ni. As a result, a high SO2 0.2%/CO2 10% uptake ratio of 32 at 298 K and 1 bar and a high SO2 uptake capacity of 0.67 mmol g–1 at 0.002 bar were achieved for the mixed-matrix adsorbents of SIFSIX-3-Ni@PIL-1/1. The strategy for fabricating a perm-selective matrix around the porous adsorbent particles to improve the adsorption performance is generally applicable to other porous adsorbents.