Engineering Iron-Nickel Nanoparticles for Magnetically Induced CO₂ Methanation in Continuous Flow

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Induction heating of magnetic nanoparticles (NPs) is crucial for activating heterogeneous catalytic reactions.
• Effective catalytic systems require NPs with high heating power and catalytic activity.

Purpose of the Study:

• To develop bimetallic NPs for magnetically induced CO2 methanation.
• To enhance catalytic performance through surface engineering.

Main Methods:

• Organometallic synthesis of iron-nickel (Fe30Ni70) NPs.
• Surface modification by depositing a thin nickel layer to create Fe30Ni70@Ni NPs.
• Evaluation of NPs' heating power, catalytic activity, and selectivity for CO2 hydrogenation.

Main Results:

• Fe30Ni70 NPs showed high heating power but limited methane selectivity (65%) after deposition on SiRAlOx.
• Fe30Ni70@Ni NPs achieved 100% conversion and 100% methane selectivity under mild magnetic induction conditions.
• The engineered NPs demonstrated high activity and selectivity for CO2 hydrogenation.

Conclusions:

• Surface engineering of bimetallic NPs significantly improves catalytic performance for CO2 methanation.
• Fe30Ni70@Ni NPs are highly effective for magnetically induced CO2 hydrogenation, yielding quantitative methane production.
• This approach offers a promising pathway for efficient CO2 conversion using magnetic induction heating.