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Photothermal direct methane conversion to formaldehyde at the gas-solid interface under ambient pressure.

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This study presents a new continuous-flow method for converting methane to formaldehyde using photothermal catalysis. This green chemistry approach achieves high production rates and selectivity, overcoming industrial implementation challenges.

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Area of Science:

  • Catalysis
  • Green Chemistry
  • Materials Science

Background:

  • Conventional methane conversion is energy-intensive and has a high carbon footprint.
  • Batch-type gas-liquid-solid systems face challenges in product separation and concentration.
  • Developing efficient and sustainable methane conversion routes is crucial.

Purpose of the Study:

  • To demonstrate a continuous-flow gas-solid photothermal catalytic route for methane conversion to formaldehyde.
  • To overcome the limitations of high-pressure batch systems for industrial application.
  • To achieve efficient product separation and concentration.

Main Methods:

  • Utilized a continuous-flow gas-solid photothermal catalytic reactor.
  • Employed Ag single-atom modified ZnO as the photocatalyst.
  • Collected gas-phase formaldehyde via water absorption.

Main Results:

  • Achieved a formaldehyde production rate of 117.8 ± 1.7 μmol h⁻¹ with 71.2 ± 0.8% selectivity.
  • Obtained a highly concentrated formaldehyde solution (514.2 ± 33.7 µmol mL⁻¹, 1.54 ± 0.10 wt.%) after 12-hour water absorption.
  • Demonstrated effective product enrichment, overcoming conventional batch reaction barriers.

Conclusions:

  • Established a continuous-flow photothermal catalytic route for sustainable methane to formaldehyde conversion.
  • The Ag-ZnO catalyst shows high efficiency and selectivity under ambient pressure.
  • This technology provides a foundation for industrial-scale methane valorization.