Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.036
Publication date: 16th December 2024
Ammonium nitrate is a key chemical feedstock which is produced by two energy intense processes, that is nitrogen reduction (Haber-Bosch Process) and catalytic ammonia oxidation (Ostwald Process). To-date, in industry, both processes use fossil fuels as energy input and raw materials. In this presentation, we propose the development of (photo-)electrochemically driven reactors capable of coupling the nitrogen-to-ammonium reduction reaction (NRR) and the nitrogen-to nitrate oxidation reaction (NOR), leading to autonomous flow photoreactors for ammonium nitrate production from nitrogen, water, sunlight, and sustainable electricity.
Specifically, we weill report on the development of noble-metal-free single atom catalysts (SACs, 1 metal reaction center) and single-site catalysts (SSCs 2 metal reaction centers) anchored to electrically conductive carbon supports.[1,2] Variation of the SAC/SSC metal sites will allow control of NRR/NOR performance, while metal stabilization in a well-defined all-oxo coordination environment will allow us to tune reactivity. Deposition of these molecular precursors on high-porosity is used to facilitate stable mechanical and electrical linkage between catalyst and electrode. In situ/operando (photo-)electrochemical studies and theoretical modelling will be reported to gain insights into the system performance, selectivity and stability. This will provide insights from the atomic to the reactor-level on the catalytic performance, its limitations, and enable us to identify key optimization parameters.
Funding by the Deutsche Forschungsgemeinschaft DFG via Priority Program PP2370 "Nitroconversion" is gratefully acknowledged.
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