Spectroscopy-guided optimization of copper-based catalysts for low-temperature CO₂ recycling to CO

Area of Science:

• Catalysis
• Materials Science
• Chemical Engineering

Background:

• The reverse water-gas shift (RWGS) reaction is crucial for CO2 valorization, producing CO for industrial applications.
• Low and medium temperature RWGS catalysts face challenges due to endothermic nature and competing reactions, limiting industrial integration.

Purpose of the Study:

• To design and optimize Cu-based materials for efficient low-temperature RWGS.
• To understand catalyst deactivation mechanisms, specifically coking, and develop strategies to mitigate it.

Main Methods:

• Synthesis and characterization of Cu/TiO2 catalysts.
• Utilized *operando* UV-vis, DRIFTS, and NAP-XPS spectroscopies for in-situ analysis.
• Investigated the effect of Platinum (Pt) doping on catalyst performance and stability.

Main Results:

• Identified acrolein as a major coke precursor, elucidating deactivation pathways.
• Pt doping significantly reduced coke deposition, enhancing catalyst longevity.
• Developed a PtCuK@ catalyst exhibiting superior activity, selectivity, and regenerability.

Conclusions:

• Optimized Cu-based catalysts with Pt doping offer a viable solution for stable and efficient low-temperature RWGS.
• The study provides a framework for developing durable catalysts for sustainable CO2 utilization.
• Advanced RWGS catalysts pave the way for industrial CO2 valorization.