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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Catalytic nitrogen fixation using visible light energy.

Yuya Ashida1, Yuto Onozuka1, Kazuya Arashiba1

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.

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Researchers developed a novel process for ammonia synthesis using visible light and cooperative catalysts. This sustainable method avoids fossil fuels, offering a greener alternative for nitrogen fixation.

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Area of Science:

  • Green Chemistry
  • Catalysis
  • Sustainable Energy

Background:

  • Ammonia synthesis (nitrogen fixation) is vital for humanity.
  • Current industrial methods rely on fossil fuels, posing sustainability challenges.
  • Developing renewable energy-driven nitrogen fixation is a key research goal.

Purpose of the Study:

  • To establish a catalytic process for ammonia synthesis using visible light.
  • To utilize renewable energy for nitrogen fixation, aligning with sustainable chemistry principles.

Main Methods:

  • An iridium- and molybdenum-catalyzed system was developed.
  • Cooperative catalysts, including iridium and molybdenum complexes with N-heterocyclic carbene pincer ligands, were employed.
  • Reactions were conducted under ambient conditions with visible light irradiation.

Main Results:

  • Ammonia was synthesized from atmospheric dinitrogen under ambient conditions.
  • The process was driven by visible light energy.
  • Iridium and molybdenum catalysts cooperatively activated dihydroacridine and dinitrogen.

Conclusions:

  • A novel, visible light-driven catalytic system for ammonia synthesis was successfully established.
  • This method offers a sustainable alternative to traditional nitrogen fixation processes.
  • The cooperative catalysis approach enables thermodynamically challenging reactions under mild conditions.