CO₂ Hydrogenation to Methanol over Mesoporous SiO₂-Coated Cu-Based Catalysts

Area of Science:

• Heterogeneous catalysis
• Materials science
• Chemical engineering

Background:

• Copper-based catalysts are crucial for CO2 hydrogenation to methanol.
• Active phase aggregation limits catalyst performance under reaction conditions.
• Improving textural properties is key to overcoming these limitations.

Purpose of the Study:

• To enhance the textural properties of Cu/In2O3/CeO2 and Cu/In2O3/ZrO2 catalysts.
• To improve catalyst stability and performance in CO2 hydrogenation.
• To investigate the effect of mesoporous silica shell coating on catalyst structure and activity.

Main Methods:

• Synthesis of Cu/In2O3/CeO2 and Cu/In2O3/ZrO2 catalysts.
• Coating catalyst nanoparticles with a mesoporous SiO2 shell.
• Characterization of catalyst properties (e.g., particle size, dispersion, interface region).
• Evaluation of catalytic performance in CO2 hydrogenation using chemometric analysis.

Main Results:

• Silica shell coating limited nanoparticle size to 3.5 nm, enhancing metal dispersion.
• The coating widened the metal-metal oxide interface region, crucial for catalysis.
• Coated catalysts exhibited significantly higher activity and selectivity, with methanol space-time yields up to 4 times greater than uncoated catalysts.

Conclusions:

• Mesoporous silica shell coating is an effective strategy to improve Cu-based catalysts for CO2 hydrogenation.
• This approach enhances catalyst structural stability and performance.
• The improved catalysts offer a promising pathway for efficient methanol production from CO2.