Visible-light-driven conversion of methane to methanol mediated by hydroxyl radical

Area of Science:

• Catalysis
• Green Chemistry
• Materials Science

Background:

• Selective methane (CH4) oxidation to methanol (CH3OH) is crucial for chemical synthesis and energy sustainability.
• The inert nature of CH4 and risk of overoxidation pose significant challenges for artificial reaction systems.
• Noble-metal-free catalysts are sought for cost-effective and sustainable chemical transformations.

Purpose of the Study:

• To develop an effective, noble-metal-free catalyst for selective methane oxidation to methanol.
• To investigate the mechanism of methane oxidation promoted by hydroxyl radicals generated via FeIII/FeII cycling.
• To achieve high yield and selectivity of methanol under mild, visible-light conditions.

Main Methods:

• Synthesis of a novel iron-based catalyst (UNFe).
• Methane oxidation reaction under visible light irradiation at room temperature.
• Analysis of methanol yield and selectivity using gas chromatography and other analytical techniques.

Main Results:

• The UNFe catalyst demonstrated exceptional performance in methane oxidation to methanol.
• High methanol generation yield (289 ± 10 μmol·g⁻¹) and selectivity (96%) were achieved.
• Hydroxyl radical (OH) generation via FeIII/FeII cycling was identified as key to the catalytic activity.

Conclusions:

• The developed UNFe catalyst offers an effective and cost-efficient solution for methane oxidation to methanol.
• The facile strategy utilizing visible light and a noble-metal-free catalyst aligns with green chemistry principles.
• This work provides a promising pathway for sustainable methanol production from methane.