Efficient CO₂ Hydrogenation to Formate with a Continuous-Flow System under Mild Conditions Catalyzed by Ir-Based...

Area of Science:

• Catalysis
• Materials Science
• Green Chemistry

Background:

• Developing efficient catalytic systems for carbon dioxide (CO2) hydrogenation is crucial for sustainable chemical production.
• Continuous-flow systems offer enhanced safety and efficiency compared to batch processes.
• Mild reaction conditions are desirable to reduce energy consumption and operational costs.

Purpose of the Study:

• To develop and investigate novel iridium-based porous organic polymers (KAPs-Ir) for continuous-flow CO2 hydrogenation.
• To achieve high catalytic performance under mild conditions.
• To evaluate the stability and reusability of the KAPs-Ir catalyst.

Main Methods:

• Synthesis of a series of iridium-based porous organic polymers (KAPs-Ir).
• Testing the KAPs-Ir catalyst in a continuous-flow CO2 hydrogenation system.
• Optimization of reaction conditions, including temperature and pressure.
• Long-term stability tests of the catalyst.

Main Results:

• A KAPs-Ir catalyst (KAPs-1c Ir: 0.37 wt%) achieved a high productivity of 10,403 mmol_FA g_Ir^-1 h^-1 for CO2 hydrogenation to formate.
• This productivity was obtained under mild conditions (80°C and 0.4 MPa).
• The catalyst demonstrated excellent stability, maintaining reactivity for at least 240 hours.

Conclusions:

• KAPs-Ir catalysts are highly effective for continuous-flow CO2 hydrogenation.
• The developed system significantly outperforms existing methods in terms of productivity and reaction conditions.
• The catalyst's stability ensures its potential for practical applications in CO2 conversion.