Reversible adsorption and confinement of nitrogen dioxide within a robust porous metal-organic framework
- Han, Xue
- Godfrey, Harry G.W.
- Briggs, Lydia
- Davies, Andrew J.
- Cheng, Yongqiang
- Daemen, Luke L.
- Sheveleva, Alena M.
- Tuna, Floriana
- McInnes, Eric J.L.
- Sun, Junliang
- Drathen, Christina
- George, Michael W.
- Ramirez-Cuesta, Anibal J.
- Thomas, K. Mark
- Schröder, Martin
- Yang, Sihai
DOIAbstract
Nitrogen dioxide (NO2) is a major air pollutant causing significant environmental and health problems. We report reversible adsorption of NO2 in a robust metal–organic framework. Under ambient conditions, MFM-300(Al) exhibits a reversible NO2 isotherm uptake of 14.1 mmol g−1, and, more importantly, exceptional selective removal of low-concentration NO2 (5,000 to <1 ppm) from gas mixtures. Complementary experiments reveal five types of supramolecular interaction that cooperatively bind both NO2 and N2O4 molecules within MFM-300(Al). We find that the in situ equilibrium 2NO2 ↔ N2O4 within the pores is pressure-independent, whereas ex situ this equilibrium is an exemplary pressure-dependent first-order process. The coexistence of helical monom...
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