Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
Publication date: 18th July 2023
NOx gases originating from fossil fuel combustion are a key contributor to air pollution, posing severe implications for air quality, human health and ecosystems. Their conversion has been implemented in transportation and in many industrial processes, but typically require stoichiometric amounts of ammonia or urea to proceed. In the current work, we propose to transform these harmful gases into a useful product, ammonia, using an innovative electrocatalytic process. This offers an environmentally friendly alternative to the energy intensive and carbon dioxide producing Haber-Bosch method for ammonia generation, whilst contributing to a flue gas waste removal process. Traditional issues with electrochemical NOx reduction, primarily the low concentration in gas streams, have been overcome here by employing a membrane-electrode-assembly electrolyzer, enabling us to perform the reaction directly with a dilute NOx gas stream. The applied catalyst demonstrated a promising yield rate of 0.45 mmol/h⋅cm2, successfully converting up to 89% of NOx in the gas stream to ammonia.
This work was financially supported by the Swiss National Science Foundation (SNSF) project funding (grant No 200021_197153/1).
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