Hybrid Photo- and Thermal Catalyst System for Continuous CO₂ Reduction

Area of Science:

• Catalysis and Chemical Engineering
• Materials Science
• Renewable Energy Technologies

Background:

• Heterogeneous thermal catalysis is crucial for industrial chemical production but is energy-intensive, relying heavily on fossil fuels.
• Photochemically enhanced catalysts offer a potential solution by integrating solar energy to reduce process heat requirements.

Purpose of the Study:

• To demonstrate a practical photo- and thermal catalyst system for reducing carbon dioxide (CO2) to carbon monoxide (CO) via the reverse water gas shift reaction.
• To develop and test a novel catalyst and reactor module for enhanced efficiency and reduced energy consumption.

Main Methods:

• Designed a SiO2 on Al photo- and thermal catalyst system for indium oxide hydroxide (In2O3-(OH)x) catalysts using a first-principles approach.
• Utilized a compact, electrically heated photo- and thermal annular reactor module for continuous operation.

Main Results:

• Achieved a 5-fold light enhancement in CO production rate, the highest reported for this model photocatalyst.
• Demonstrated over 70 hours of stable CO production.
• Reduced heater power consumption by 31% with 2 suns of irradiation.

Conclusions:

• The developed photo- and thermal catalyst system and reactor module show strong performance in harvesting both light and thermal energy.
• This technology offers a promising pathway to reduce the energy intensity of industrial catalytic processes by utilizing solar energy.