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Catalytic Reduction of Dinitrogen via Hydroboration
Shun Suginome1, Atsushi Okochi1, Taiji Nakamura2
1Department of Applied Chemistry, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-8656, Japan.
Journal of the American Chemical Society
|July 17, 2025
Summary
Researchers developed a new catalytic method for nitrogen fixation under mild conditions. This process uses molybdenum-nitride catalysts to convert dinitrogen (N₂) into borylamines, offering a promising alternative to the energy-intensive Haber-Bosch process.
Area of Science:
- Inorganic Chemistry
- Catalysis
- Sustainable Chemistry
Background:
- The Haber-Bosch process, essential for ammonia production, requires extreme temperatures and pressures.
- Developing alternative, milder nitrogen fixation methods is crucial for sustainability.
- Catalytic conversion of dinitrogen (N₂) using milder reductants remains a significant challenge.
Purpose of the Study:
- To report a novel catalytic system for the reduction of dinitrogen (N₂) under mild conditions.
- To investigate the hydroboration pathway for N₂ conversion.
- To advance the development of efficient nitrogen fixation technologies.
Main Methods:
- Catalytic reduction of N₂ using catecholborane as a reductant.
- Employing molybdenum-nitride complexes with PCP-type pincer ligands as catalysts.
- Conducting the reaction at 60 °C and 1 atm N₂ pressure.
Main Results:
- Achieved catalytic conversion of N₂ to borylamines with up to 32 equivalents yield.
- The reaction proceeds via successive hydroboration, hydride disproportionation, and N-N bond cleavage.
- Demonstrated the regeneration of the active molybdenum-nitride catalyst.
Conclusions:
- Mild-condition catalytic reduction of N₂ via hydroboration is feasible.
- This method offers a significant advancement over the Haber-Bosch process.
- The developed system represents a step towards ideal nitrogen fixation systems.
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