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Open Access Publications from the University of California

Capture of nitrogen dioxide and conversion to nitric acid in a porous metal-organic framework.

  • Author(s): Li, Jiangnan
  • Han, Xue
  • Zhang, Xinran
  • Sheveleva, Alena M
  • Cheng, Yongqiang
  • Tuna, Floriana
  • McInnes, Eric JL
  • McCormick McPherson, Laura J
  • Teat, Simon J
  • Daemen, Luke L
  • Ramirez-Cuesta, Anibal J
  • Schröder, Martin
  • Yang, Sihai
  • et al.

Air pollution by nitrogen oxides, NOx, is a major problem, and new capture and abatement technologies are urgently required. Here, we report a metal-organic framework (Manchester Framework Material 520 (MFM-520)) that can efficiently confine dimers of NO2, which results in a high adsorption capacity of 4.2 mmol g-1 (298 K, 0.01 bar) with full reversibility and no loss of capacity over 125 cycles. Treatment of NO2@MFM-520 with water in air leads to a quantitative conversion of the captured NO2 into HNO3, an important feedstock for fertilizer production, and fully regenerates MFM-520. The confinement of N2O4 inside nanopores was established at a molecular level, and the dynamic breakthrough experiments using both dry and humid NO2 gas streams verify the excellent stability and selectivity of MFM-520 and confirm its potential for precious-metal-free deNOx technologies.

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