Magnetically tunable selectivity in methane oxidation enabled by Fe-embedded liquid metal catalysts

Area of Science:

• Catalysis
• Materials Science
• Nanotechnology

Background:

• Liquid metal catalysts offer unique structural flexibility due to atomic mobility at room temperature.
• Controlling catalyst nanostructure is crucial for tuning chemical reactions.
• External stimuli, like magnetic fields, present opportunities for dynamic catalyst control.

Purpose of the Study:

• To design and demonstrate a reconfigurable liquid metal catalyst system.
• To investigate the effect of external magnetic fields on catalyst structure and activity.
• To achieve reversible control over chemical product distribution using magnetic fields.

Main Methods:

• Fabrication of an iron-embedded liquid metal catalyst.
• Application of an external magnetic field to control iron atom aggregation and spin.
• Analysis of product distribution (methyl hydroperoxide and acetic acid) under varying magnetic field strengths.

Main Results:

• The catalyst demonstrated reversible switching between atomic dispersion and clustering of iron atoms controlled by a magnetic field.
• This switching enabled tunable production of methyl hydroperoxide (up to 99.9% selectivity) and acetic acid (up to 91.7% selectivity).
• Promising production rates were achieved for both products under ambient conditions.

Conclusions:

• External magnetic fields can precisely control catalytic pathways in liquid metal systems.
• This approach offers a novel method for dynamic tuning of chemical synthesis.
• The iron-embedded liquid metal catalyst shows significant potential for applications in controlled chemical production.