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Warren, Mark
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- 2024In situ single-crystal X-ray diffraction studies of physisorption and chemisorption of SO2 within a metal-organic framework and its competitive adsorption with watercitations
- 2022Damage accumulation comparison for various vibration test profile generation methods applied to a complex payload
- 2020Watching Photochemistry Happencitations
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article
In situ single-crystal X-ray diffraction studies of physisorption and chemisorption of SO2 within a metal-organic framework and its competitive adsorption with water
Abstract
Living on an increasingly polluted planet, the removal of toxic pollutants such as sulfur dioxide (SO<sub>2)</sub> from the troposphere and power station flue gas is becoming more and more important. The CPO-27/MOF-74 family of metal–organic frameworks (MOFs) with their high densities of open metal sites is well suited for the selective adsorption of gases that, like SO<sub>2</sub>, bind well to metals and have been extensively researched both practically and through computer simulations. However, until now, focus has centered upon the binding of SO<sub>2</sub> to the open metal sites in this MOF (called chemisorption, where the adsorbent–adsorbate interaction is through a chemical bond). The possibility of physisorption (where the adsorbent–adsorbate interaction is only through weak intermolecular forces) has not been identified experimentally. This work presents an <i>in situ</i> single-crystal X-ray diffraction (scXRD) study that identifies discrete adsorption sites within Ni-MOF-74/Ni-CPO-27, where SO<sub>2</sub> is both chemisorbed and physisorbed while also probing competitive adsorption of SO<sub>2</sub> of these sites when water is present. Further features of this site have been confirmed by variable SO<sub>2</sub> pressure scXRD studies, DFT calculations, and IR studies.