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Inorganic Nitrogen Assimilation01:22

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Laser-induced nitrogen fixation.

Huize Wang1, Ranga Rohit Seemakurthi2, Gao-Feng Chen3

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|September 13, 2023
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Researchers developed a novel method for ammonia synthesis at ambient conditions using laser-induced dissociation of lithium oxide. This approach significantly enhances ammonia yield, offering a promising alternative for industrial decarbonization.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Photochemistry

Background:

  • Industrial ammonia production is energy-intensive and a major source of CO2 emissions.
  • Current renewable-based ammonia synthesis methods lack industrial scalability due to low yield and efficiency.

Purpose of the Study:

  • To develop a novel, efficient, and scalable method for ammonia synthesis at ambient conditions.
  • To demonstrate a new approach for nitrogen fixation using laser-induced chemistry.

Main Methods:

  • Utilizing laser-induced multiphoton dissociation of lithium oxide under infrared light.
  • Synthesizing ammonia via nitrogen fixation by laser-generated zero-valent metal and subsequent hydrolysis.
  • Employing a commercial CO2 laser for focused infrared light generation.

Main Results:

  • Achieved a record ammonia yield rate of 30.9 micromoles/sec/cm² at 25°C and 1.0 bar nitrogen.
  • Demonstrated ammonia synthesis rates two orders of magnitude higher than existing ambient condition methods.
  • Validated the potential of using solar-pumped lasers for nitrogen fixation.

Conclusions:

  • Laser-induced dissociation of lithium oxide offers a highly efficient pathway for ammonia synthesis.
  • This technology presents a significant advancement for decarbonizing ammonia production and enabling localized synthesis.
  • The method opens avenues for new laser-driven chemical applications.