Morphologically tuned CuO-ZnO-CeO₂ catalyst for CO₂ hydrogenation to methanol

Area of Science:

• Materials Science
• Catalysis
• Chemical Engineering

Background:

• Developing efficient catalysts is crucial for sustainable chemical synthesis.
• Composite metal oxides offer tunable properties for catalytic applications.
• Solvent effects in synthesis significantly impact catalyst performance.

Purpose of the Study:

• To synthesize and characterize morphologically modified CuO-ZnO-CeO2 composite catalysts.
• To investigate the influence of solvent on catalyst properties and performance.
• To evaluate the catalytic activity of the synthesized materials for CO2 conversion and methanol synthesis.

Main Methods:

• Single-step hydrothermal synthesis.
• Characterization using XRD, FE-SEM, BET, XPS, and H2-TPR.
• Catalytic performance evaluation in a fixed-bed flow reactor.
• In situ DRIFTS for reaction pathway analysis.

Main Results:

• The CZC-1 catalyst, prepared with a specific DMF ratio, exhibited enhanced active sites, including nanowire morphology, large surface area, and increased oxygen vacancies.
• CZC-1 achieved 13.6% CO2 conversion and 74.1% methanol selectivity at 225 °C and 30 bar.
• In situ DRIFTS confirmed a carbonate-formate-methoxy pathway for methanol formation.

Conclusions:

• Solvent choice critically influences the structural and catalytic properties of CuO-ZnO-CeO2 catalysts.
• The optimized CZC-1 catalyst shows promising performance for CO2 conversion to methanol.
• Understanding the reaction mechanism provides insights for further catalyst design.