Efficient methane-to-acetylene conversion using low-current arcs

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.