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Trace SO2 capture and conversion by a zirconium MOF
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DOI：10.1016/j.mser.2025.101074.png)
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Abstract
En 中文
Whereas 95 % of SO2 from flue gas streams is removed by conventional flue-gas desulfurization (FGD) technologies, multi-stage energy-intensive and waste-generating scrubbing is needed to meet current emission standards (≤35 ppm) and requirements for processes such as CO2 capture and denitrification (<10 ppm). Despite the availability of numerous methods and materials for desulfurization, the integrated capture and conversion of trace SO2 remains challenges. Herein, we report that the layered metal-organic framework (MOF) BUT-86 captures trace (100 ppm) SO2 from simulated flue gas to afford effluent SO2 levels < 10 ppb. Performance is driven by exceptional SO2/CO2 selectivity at 80 % RH. Captured SO2 can be subsequently removed by room temperature conversion to 2-hydroxypropane-2-sulfonic acid to regenerate BUT-86. Reactive SO2 binding involving bisulfite formation that requires the presence of adsorbed water drives the performance of BUT-86, the first sorbent that enables integrated trace SO2 capture and conversion from flue gas.
Keywords:
SO2 capture
metal-organic framework
trace sulfur dioxide
flue gas desulfurization
selective adsorption
Journal
M
IF:
26.8
Papers:
809
Citations:
1.1W