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School of Physical Science and Technology , ShanghaiTech University, Shanghai 201210 , China.
Published: February 2020
AI Article Synopsis
Researchers developed new metal-organic frameworks (MOFs) that are stable in harsh conditions for capturing CO from flue gas, which includes water vapor and acidic gases.
The MOFs are enhanced by adding amino groups to their structure, resulting in strong resistance to both acidic and basic environments.
One of the MOFs shows excellent performance with high selectivity for CO over other gases, low energy needs for regeneration, and effective CO capture even in humid conditions.
Article Abstract
Construction of thermally and chemically robust metal-organic frameworks (MOFs) is highly desirable for postcombustion CO capture from flue gas containing water vapor and other acidic gases. Here we report a strategy based on appending amino groups to the triazolate linkers of MOFs to achieve exceptional chemical stability against aqueous, acidic, and basic conditions. These MOFs exhibit not only CO/N thermodynamic adsorption selectivity as high as 120 but also CO/HO kinetic adsorption selectivity up to 70, featuring distinct adsorptive sites at the channel center for CO and at the corner for HO, respectively. The best performing MOF in this series features low regeneration energy, high CO capture utility under humid conditions, and decent cycling performance for mimic flue gas.
