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Area of Science:

  • Catalysis
  • Plasma Chemistry
  • Nanomaterials Science

Background:

  • Direct conversion of methane to C2 hydrocarbons is challenging due to over-dehydrogenation and low selectivity.
  • Non-thermal plasma offers mild conditions but faces competing side reactions.

Purpose of the Study:

  • To develop a bifunctional nanoreactor for selective methane to C2 hydrocarbon conversion.
  • To enhance selectivity towards acetylene (C2H2) and ethylene (C2H4) using plasma activation.

Main Methods:

  • Design and synthesis of a shielded, hollow, mesoporous nanoreactor (Na2WO4-Mn3O4/m-SiO2).
  • Utilizing internal tandem catalysis with isolated Na2WO4 and confined Mn3O4 active sites.
  • Investigating plasma-induced methane activation and hydrocarbon coupling.

Main Results:

  • Achieved 39% methane conversion with a 42.3% fraction of C2H2 and C2H4.
  • Na2WO4 facilitated the formation of reactive intermediates (CH*, CH2*).
  • Mn3O4 promoted the coupling of intermediates to C2 hydrocarbons.
  • Mesoporous channels prevented deep dehydrogenation and carbon deposition.

Conclusions:

  • The nanoreactor enables highly selective nonoxidative conversion of methane to C2 hydrocarbons.
  • The shielded bifunctional design offers a new paradigm for plasma-driven chemical processes.
  • This approach provides a promising route for producing valuable unsaturated C2 hydrocarbons from methane.