Abstract
Nitrogen dioxide (NO2) is a major air pollutant causing significant environmental1,2 and health problems3,4. 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 monomer–dimer chains of NO2 in MFM-300(Al) could provide a foundation for the fundamental understanding of the chemical properties of guest molecules within porous hosts. This work may pave the way for the development of future capture and conversion technologies.
Original language | English |
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Pages (from-to) | 691-696 |
Number of pages | 6 |
Journal | Nature Materials |
Volume | 17 |
Issue number | 8 |
DOIs | |
State | Published - Aug 1 2018 |
Funding
We thank the EPSRC (EP/I011870), the ERC (AdG 226593) and the Universities of Manchester and Nottingham for funding. We thank the EPSRC for funding of the EPSRC National Service for EPR Spectroscopy at Manchester. We are especially grateful to ORNL and the ESRF for access to the Beamlines VISION and ID22, respectively. We thank C. Dejoie for help at Beamline ID22 at the ESRF. The computing resources were made available through the VirtuES and the ICE-MAN projects, funded by the Laboratory Directed Research and Development program at ORNL. A.M.S. thanks the Russian Science Foundation (grant no. 17-73-10320) and the Royal Society of Chemistry for funding. M.S. acknowledges the Russian Ministry of Science and Education for the award of a Russian Megagrant (14.Z50.31.0006).