Journal
CHEMSUSCHEM
Volume 15, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202102526
Keywords
green ammonia; nitrogen oxides; NOx storage; plasma chemistry; process electrification
Funding
- Flemish Government through the Moonshot cSBO project P2C [HBC.2019.0108]
- Flemish Government
- KU Leuven [C3/20/067]
- Excellence of Science FWO-FNRS project [GoF9618n, 30505023]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [810182]
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Industrial ammonia production without CO2 emission and with low energy consumption is a major challenge. Current methods relying on thermally activated iron catalysts at high pressure and continuous operation mode are difficult to electrify. Electrochemical solutions face issues with the inertness of nitrogen molecules on electrodes. This study proposes an oxidative route for N-2 activation as an energy-efficient option for small-scale distributed ammonia production with renewable electricity and without intrinsic CO2 footprint.
Industrial ammonia production without CO2 emission and with low energy consumption is one of the technological grand challenges of this age. Current Haber-Bosch ammonia mass production processes work with a thermally activated iron catalyst needing high pressure. The need for large volumes of hydrogen gas and the continuous operation mode render electrification of Haber-Bosch plants difficult to achieve. Electrochemical solutions at low pressure and temperature are faced with the problematic inertness of the nitrogen molecule on electrodes. Direct reduction of N-2 to ammonia is only possible with very reactive chemicals such as lithium metal, the regeneration of which is energy intensive. Here, the attractiveness of an oxidative route for N-2 activation was presented. N-2 conversion to NOx in a plasma reactor followed by reduction with H-2 on a heterogeneous catalyst at low pressure could be an energy-efficient option for small-scale distributed ammonia production with renewable electricity and without intrinsic CO2 footprint.
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