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Article Dans Une Revue Angewandte Chemie International Edition Année : 2022

Ammonia Synthesis at Room Temperature and Atmospheric Pressure from N2

Résumé

Ammonia, NH 3 , is an essential molecule, being part of fertilizers. It is currently synthesized via the Haber-Bosch process, from the very stable dinitrogen molecule, N 2 and dihydrogen, H 2 . This process requires high temperatures and pressures, thereby generating ca 1.6% of the global CO 2 emissions. Alternative strategies are needed to realize the functionalization of N 2 to NH 3 under mild conditions. Here, we show that boron-centered radicals provide a means of activating N 2 at room temperature and atmospheric pressure whilst allowing a radical process to occur, leading to the production of borylamines. Subsequent hydrolysis released NH 4 + , the acidic form of NH 3 . EPR spectroscopy supported the intermediacy of radicals in the process, corroborated by DFT calculations, which rationalized the mechanism of the N 2 functionalization by R 2 B radicals.

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Chimie
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Dates et versions

hal-03839021 , version 1 (04-11-2022)

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Soukaina Bennaamane, Barbara Rialland, Lhoussain Khrouz, Marie Fustier-Boutignon, Christophe Bucher, et al.. Ammonia Synthesis at Room Temperature and Atmospheric Pressure from N2: A Boron‐Radical Approach. Angewandte Chemie International Edition, 2022, ⟨10.1002/anie.202209102⟩. ⟨hal-03839021⟩
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