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Photo-Driven Aerobic Methane Nitration.

Xuefeng He1, Lina Zhang1, Jiawei Chen1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, iChem, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.

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Summary
This summary is machine-generated.

Researchers converted methane (CH4) to methanol (CH3OH) using nitrogen dioxide (NO2) and visible light. This novel photochemical method offers a new pathway for selective methane transformation and valuable oxygenate production.

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Area of Science:

  • Chemical Engineering
  • Photochemistry
  • Catalysis

Background:

  • Methane conversion to oxygenates is highly valuable but challenging.
  • Photochemical reactions in atmospheric chemistry are well-studied but not applied to preparative methane conversion.
  • Nitrogen dioxide (NO2) can act as a photo-mediator.

Purpose of the Study:

  • To develop a novel photochemical method for converting methane (CH4) to methanol (CH3OH).
  • To utilize nitrogen dioxide (NO2) as a photo-mediator and molecular oxygen (O2) as the oxidant.
  • To explore the potential of this system for selective methane transformation.

Main Methods:

  • Visible light irradiation of nitrogen dioxide (NO2) generated from aluminum nitrate (Al(NO3)3).
  • Reaction of excited NO2 with methane (CH4) and molecular oxygen (O2) to form methyl nitrate (CH3ONO2).
  • Hydrolysis of methyl nitrate to methanol (CH3OH).
  • Recycling of nitric acid (HNO3) and nitrate (NO3-) to Al(NO3)3 to complete a chemical loop.
  • Catalysis using hydrochloric acid (HCl) via hydrogen atom-transfer reactions.

Main Results:

  • Achieved up to 17% methane conversion.
  • Obtained 78% selectivity for methyl nitrate (CH3ONO2).
  • Demonstrated a recyclable chemical loop involving nitric acid and nitrate.
  • Showcased the catalytic effect of HCl on the photochemical process.

Conclusions:

  • A simple and effective photochemical system for methane oxidation to methanol has been developed.
  • This method utilizes readily available reagents and visible light, offering a sustainable approach.
  • The system shows promise for selective methane transformation and the production of valuable oxygenates.