ammonia synthesis

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• Review Article
• Published: 25 May 2023

Prospects and challenges of green ammonia synthesis

• Dongpei Ye   ORCID: orcid.org/0000-0003-0091-6994 1 &
• Shik Chi Edman Tsang   ORCID: orcid.org/0000-0002-8796-3146 1  

Nature Synthesis volume  2 ,  pages 612–623 ( 2023 ) Cite this article

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• Chemical hydrogen storage
• Heterogeneous catalysis

Ammonia is a chemical commodity in high demand, owing to its use in agriculture as well as its potential as a chemical vector for renewable energy storage and transportation. At present, ammonia synthesis consumes 1–2% of the world’s total energy output while producing 1% of the world’s total carbon emissions. Thus, the development of greener synthetic routes to ammonia is urgently required. In this Review, we discuss the progress and challenges in regard to the technological and economic aspects of various routes to green ammonia synthesis. Fundamental mechanisms, including the classical N 2 dissociative process, the newly identified associative process for catalytic N 2 conversion to NH 3 under milder conditions and the chemical looping pathway, are discussed to guide novel catalyst designs. In particular, associative N 2 activation can be achieved at low pressure, which is more adaptable for coupling to renewable energy (such as solar, wind or tidal), offering a new industrial production route to green ammonia. Additional possibilities for direct large-scale green ammonia synthesis through electrochemical and photochemical approaches are also discussed. Finally, a scaleup roadmap for ammonia synthesis is described alongside recent industrial developments, highlighting the rapid evolution and prosperous future of green ammonia generation.

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We acknowledge financial support from the Engineering and Physical Sciences Research Council Divisional Cooperative Awards in Science and Technology Conversion Incentivisation Scheme and OXGRIN. Credit: fertilizer/mechanical understanding icons in the graphical abstract, Flaticon.com .

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Ye, D., Tsang, S.C.E. Prospects and challenges of green ammonia synthesis. Nat. Synth 2 , 612–623 (2023). https://doi.org/10.1038/s44160-023-00321-7

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Received : 22 November 2022

Accepted : 14 April 2023

Published : 25 May 2023

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DOI : https://doi.org/10.1038/s44160-023-00321-7

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