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Green Ammonia-Mediated CO2 Capture and Conversion to Valuable Chemicals

Wenzhen Li1,*, Hengzhou Liu1, Yifu Chen1, Shuang Gu2

1 Chemical & Biological Engineering Department, Iowa State University, 617 Bissell Rd, Ames, IA 50011, USA
2 Mechanical Engineering Department, Wichita State University, 1845 Fairmount St, Wichita, KS 67260, USA

* Corresponding Author: Wenzhen Li. Email: email

The International Conference on Computational & Experimental Engineering and Sciences 2024, 31(1), 1-1. https://doi.org/10.32604/icces.2024.012577

Abstract

Direct electrochemical conversion of CO2 capture solutions (instead of gaseous CO2) into valuable chemicals can circumvent the energy-intensive CO2 regeneration and pressurization steps. While commonly used CO2 capture agents include alkali and amine solutions, ammonia has been rarely investigated. In another aspect, mismanagement of reactive nitrogen (Nr) in waste has emerged as a major problem in water pollution to our ecosystems, causing severe eutrophication and health concerns. Sustainably recovering Nr [such as nitrate (NO3)-N] and converting it into green ammonia (NH3) could mitigate the environmental impacts of Nr and reduce the NH3 demand from the carbon-intensive Haber-Bosch process, as well as a possible CO2 capture agent due to its alkaline nature.    In this talk, we will present our rencet research on integration of electrodialysis and electrocatalysis for ammonia synthesis from dilute waste Nr sources [1], and green ammonia-mediated CO2 capture (to ammonium bicarbonate, NH4HCO3) and subsequent reduction to ammonium formate (NH4HCO2) as a new approach to CO2 capture and utilization (CCU) [2]. We have demonstrated a record-high NO3-to-NH3 performance in a scalable, versatile, and cost-effective membrane-free alkaline electrolyzer (MFAEL): an unprecedented NH3 partial current density of 4.22 ± 0.25 A cm−2 with a faradaic efficiency of 84.5 ± 4.9%. We also discovered that an ammonium bicarbonate (NH4HCO3)-fed electrolyzer with an anion exchange membrane (AEM) outperforms the state-of-the-art KHCO3 electrolyzer with a bipolar membrane (BPM) owing to its favorable thermal decomposition property, which allows for a 3-fold increase in the in situ CO2 concentration, a maximum 23% increase in formate faradaic efficiency, and a 35% reduction in cell voltage by substituting BPM with the AEM. Our integrated process by combining NH4HCO3 electrolysis with CO2 capturing by on-site generated green ammonia from the electro-reduction of nitrate in MFAEL has shown a remarkable 99.8% utilization of CO2 capturing agent. Our recent progress in this direction will also be briefly presented. Such a multi-purpose process may offer a sustainable route for the simultaneous removal of Nr wastes and streamlined CO2 capturing and upgrading to valuable chemicals.

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Cite This Article

APA Style
Li, W., Liu, H., Chen, Y., Gu, S. (2024). Green ammonia-mediated co2 capture and conversion to valuable chemicals. The International Conference on Computational & Experimental Engineering and Sciences, 31(1), 1-1. https://doi.org/10.32604/icces.2024.012577
Vancouver Style
Li W, Liu H, Chen Y, Gu S. Green ammonia-mediated co2 capture and conversion to valuable chemicals. Int Conf Comput Exp Eng Sciences . 2024;31(1):1-1 https://doi.org/10.32604/icces.2024.012577
IEEE Style
W. Li, H. Liu, Y. Chen, and S. Gu, “Green Ammonia-Mediated CO2 Capture and Conversion to Valuable Chemicals,” Int. Conf. Comput. Exp. Eng. Sciences , vol. 31, no. 1, pp. 1-1, 2024. https://doi.org/10.32604/icces.2024.012577



cc Copyright © 2024 The Author(s). Published by Tech Science Press.
This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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