Synergistic promotions between CO₂ capture and in-situ conversion on Ni-CaO composite catalyst

Area of Science:

• Chemical Engineering
• Catalysis
• Materials Science

Background:

• Integrated carbon dioxide capture and conversion (iCCC) is crucial for carbon neutrality.
• Understanding synergistic effects between adsorption and catalysis is key to iCCC development.

Purpose of the Study:

• To demonstrate synergistic promotions between CO2 capture and in-situ conversion.
• To elucidate the molecular mechanisms governing these interactions.

Main Methods:

• Constructed consecutive high-temperature Calcium-looping and dry reforming of methane processes.
• Employed systematic experimental measurements and density functional theory (DFT) calculations.
• Utilized supported Ni-CaO composite catalysts.

Main Results:

• Revealed interactive facilitation of carbonate reduction and methane dehydrogenation via process intermediates.
• Identified the adsorptive/catalytic interface as critical, controlled by Ni nanoparticle loading and size on porous CaO.
• Achieved ultra-high CO2 and CH4 conversions of 96.5% and 96.0% at 650°C.

Conclusions:

• The study provides molecular insights into the synergistic effects in iCCC.
• Optimized Ni-CaO catalysts demonstrate high performance for simultaneous CO2 capture and conversion.
• This work advances cost-effective strategies for achieving carbon neutrality.