Reversible adsorption of nitrogen dioxide within a robust porous metal-organic framework

Research output: Contribution to journalArticle

  • External authors:
  • Xue Han
  • Harry G. W. Godfrey
  • Lydia Briggs
  • Andrew J. Davies
  • Yongqiang Cheng
  • Luke L. Daemen
  • Alena M. Sheveleva
  • Junliang Sun
  • Christina Drathen
  • Michael W. George
  • Anibal J. Ramirez-Cuesta
  • K. Mark Thomas

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.

Bibliographical metadata

Original languageEnglish
JournalNature Materials
Early online date11 Jun 2018
DOIs
Publication statusPublished - 2018

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