Synergistic Cu-Zr and Cu-Mn Dual-Interfaces Boost CO₂ Hydrogenation to Methanol

Area of Science:

• Catalysis Science and Technology
• Green Chemistry and Sustainable Processes
• Materials Science for Energy Applications

Background:

• Designing active and stable copper-based catalysts for CO2 hydrogenation to methanol remains a significant challenge.
• Understanding the role of interfacial sites in catalyst performance is critical for optimizing CO2 conversion.
• Current knowledge gaps hinder the development of highly efficient catalysts for methanol synthesis.

Purpose of the Study:

• To construct a high-performance copper-zirconium-manganese (CuZrMn) catalyst with abundant dual interfaces.
• To elucidate the molecular-level mechanism of CO2 hydrogenation to methanol at these interfaces.
• To establish a design principle for advanced CO2 hydrogenation catalysts.

Main Methods:

• Synthesis and characterization of a novel CuZrMn catalyst (CZM-3).
• Performance evaluation under high-pressure CO2 hydrogenation conditions (4.5 MPa, 260 °C).
• In situ DRIFTS, TPSR-MS, and transient pulse experiments to probe reaction intermediates and mechanisms.

Main Results:

• The optimized CZM-3 catalyst achieved 23.9% CO2 conversion and a methanol space-time yield of 857 g kgcat−1 h−1.
• Abundant Cu-Zr/Cu-Mn dual interfaces were successfully constructed.
• A synergistic dual-channel mechanism involving *HOCO/*CO and *HCOO intermediates was revealed, with Cu-Zr interfaces stabilizing *HCOO and Cu-Mn interfaces promoting CO2 activation.

Conclusions:

• The synergistic effect of dual interfaces significantly enhances CO2 activation and methanol productivity.
• Cu-Zr interfaces facilitate *HCOO hydrogenation, while Cu-Mn interfaces promote CO2 activation via *HOCO/*CO.
• This work provides fundamental insights into interfacial synergy, guiding the design of superior CO2 hydrogenation catalysts.