Ligand modification for enhanced CO₂ hydrogenation to methanol

Area of Science:

• Catalysis
• Chemical Engineering
• Computational Chemistry

Background:

• Methanol synthesis from CO2 is crucial for sustainable energy.
• Acid catalysis offers a promising route for CO2 hydrogenation.
• Ligand design is key to optimizing catalyst performance.

Purpose of the Study:

• To theoretically investigate the acid route for CO2 hydrogenation to methanol.
• To evaluate the performance of six ligands, including novel designs.
• To identify key factors influencing catalytic activity.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• Six ligands were theoretically screened, featuring two new structures.
• Microkinetic simulations were performed to validate findings.

Main Results:

• N-CYCLO-PP exhibited the highest catalytic performance.
• The newly designed N-CYCLO-PP ligand lowered the free-energy barrier significantly.
• A direct correlation was found between the activation free energy (ΔG‡) and hydride/formate binding energies.

Conclusions:

• N-CYCLO-PP is a highly promising ligand for CO2 hydrogenation to methanol.
• Understanding the relationship between binding energies and activation barriers is vital for catalyst design.
• Theoretical investigations provide valuable insights for developing efficient methanol synthesis catalysts.