Volume 243, 2023

Low temperature ammonia synthesis by surface protonics over metal supported catalysts

Abstract

Low-temperature ammonia synthesis by applying an electric field to a solid heterogeneous catalyst was investigated to realize an on-demand, on-site catalytic process for converting distributed renewable energy into ammonia. By applying an electric field to the catalyst, even at low temperatures, the reaction proceeds efficiently by an “associative mechanism” in which proton-conducting species on the support surface promote the formation of N2Had intermediates through surface protonics. Kinetics, isotope exchange, infrared spectroscopy, X-ray spectroscopy, and AC impedance analysis were performed to clarify the effect of metal and catalyst support structure on the reaction, and an evaluation method for the surface protonics of the support was established to analyze the reaction mechanism, and further analysis using computational chemistry was also conducted. The elementary step determining catalytic activity changed from N2 dissociation to N2H formation, and this difference resulted in high activity for ammonia synthesis at low temperatures even when using base metal catalysts such as Fe and Ni.

Graphical abstract: Low temperature ammonia synthesis by surface protonics over metal supported catalysts

Associated articles

Article information

Article type
Paper
Submitted
07 Nov 2022
Accepted
29 Nov 2022
First published
29 Nov 2022
This article is Open Access
Creative Commons BY-NC license

Faraday Discuss., 2023,243, 179-197

Low temperature ammonia synthesis by surface protonics over metal supported catalysts

Y. Sekine, Faraday Discuss., 2023, 243, 179 DOI: 10.1039/D2FD00146B

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