Multifunctional Catalyst Combination for the Direct Conversion of CO₂ to Propane

Area of Science:

• Catalysis
• Sustainable Chemistry
• Carbon Capture and Utilization

Background:

• Direct conversion of carbon dioxide (CO2) to valuable hydrocarbons is crucial for sustainable energy.
• Existing methods often focus on olefins and aromatics, neglecting other key commodities like propane.
• There is a need for efficient catalysts that can selectively produce propane from CO2.

Purpose of the Study:

• To develop a highly active and selective multifunctional catalyst for the direct conversion of CO2 to propane.
• To investigate the synergistic effects of catalyst components on propane selectivity and CO2 conversion.
• To compare the performance of SAPO-34 with ZSM-5 in CO2-to-propane conversion.

Main Methods:

• Synthesis of a multifunctional PdZn/ZrO2+SAPO-34 catalyst.
• Direct catalytic conversion of CO2 to hydrocarbons under specific reaction conditions (350 °C, 50 bar, 1500 mL g-1 h-1).
• Analysis of product selectivity, focusing on propane yield and CO2 conversion rates.

Main Results:

• Achieved total propane selectivity exceeding 50% with CO2 conversion close to 40%.
• Demonstrated high selectivity for saturated hydrocarbons (>99.9%), simplifying product purification.
• Observed enhanced propane selectivity attributed to the SAPO-34 topology and PdZn/ZrO2 synergy.

Conclusions:

• The developed PdZn/ZrO2+SAPO-34 catalyst is highly effective for direct CO2 to propane conversion.
• The catalyst's multifunctional nature and specific topology significantly boost propane selectivity.
• This work presents a promising pathway for producing essential hydrocarbons from CO2, supporting the shift from fossil fuels.