Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.082
Publication date: 16th December 2024
Over the past century, humans have altered the global nitrogen cycle so drastically that managing nitrogen has emerged as a grand engineering challenge and urgent need. The emissions-intensive Haber-Bosch process for industrial fertilizer production, which converts nitrogen gas into ammonia, outpaces wastewater nitrogen removal due to fertilizer runoff and 80% of wastewater being discharged without treatment. Refining nitrate and ammonia into valuable products through reactive separations, which integrate catalysis and separations, is a useful approach for addressing both water pollution and chemical manufacturing. For example, selective membranes and adsorbents can be leveraged to control catalytic performance by tuning microenvironments near catalyst active sites. This seminar will focus on recent work designing metal electrocatalysts for selective reduction of nitrate to ammonia, along with separation of high-purity ammonia from real wastewaters. Specifically, we focus on understanding the reaction microevenionment of titanium and cobalt in multiple catalyst architectures while leveraging a systematic study of electrolyte composition on catalyst activity, selectivity, and stability. We complement these efforts with reactive separation devices that leverage electrochemical potential to drive nitrate and ammonia transport, which advances the vision of wastewater refining: producing a tunable portfolio of products from real wastewaters.
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