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Area of Science:

  • Chemical Engineering
  • Plasma Chemistry
  • Catalysis

Background:

  • Growing natural gas production increases methane utilization as a chemical feedstock.
  • High methane activation energy is a major obstacle for its chemical conversion.
  • Direct conversion of methane to valuable chemicals like acetylene is highly desirable.

Purpose of the Study:

  • To report a novel method for the direct conversion of methane to acetylene.
  • To investigate the energy efficiency and selectivity of this conversion process.
  • To explore the role of a rotating arc and discharge gas in methane conversion.

Main Methods:

  • Utilized a novel rotating arc driven by AC electrical power for methane conversion.
  • Fed methane (CH4) at concentrations >43% diluted in hydrogen (H2) discharge gas.
  • Controlled arc length and reaction conditions to optimize energy use and selectivity.

Main Results:

  • Achieved a low specific energy requirement (SER) of 10.2 kW h kg-1 C2H2.
  • Demonstrated high acetylene (C2H2) selectivity (>90%) and carbon balance (>95%).
  • Maintained methane conversion rates >70% with suppressed soot formation due to H2.

Conclusions:

  • The novel rotating arc technology enables energy-efficient direct conversion of methane to acetylene.
  • Arc control and optimized reaction conditions are key to enhancing this process.
  • This method offers a viable pathway for utilizing methane as a chemical feedstock.