Reverse Microemulsion-Synthesized High-Surface-Area Cu/γ-Al₂O₃ Catalyst for CO₂ Conversion via Reverse Water Gas...

Area of Science:

• Catalysis
• Materials Science
• Chemical Engineering

Background:

• The reverse microemulsion method offers a route to synthesize high-surface-area catalysts.
• Copper oxide supported on alumina (CuO/γ-Al2O3) is a promising material for CO2 conversion.

Purpose of the Study:

• To synthesize and characterize a CuO/γ-Al2O3 catalyst using the reverse microemulsion method.
• To evaluate the catalytic performance of the synthesized catalyst for CO2 conversion to CO.
• To assess the stability and selectivity of the catalyst under reaction conditions.

Main Methods:

• Synthesis of CuO/γ-Al2O3 catalyst (18 wt % Cu) via reverse microemulsion.
• Calcination at 400 °C to achieve a specific surface area (SSA) of 328 m²/g.
• Evaluation of catalytic performance across temperatures (300-600 °C) and space velocities (10,000-200,000 mL/(g h)).

Main Results:

• The catalyst achieved 100% selectivity to CO generation.
• Near-equilibrium CO2 conversion (approx. 50%) was attained at 500 °C with a space velocity of 10,000 mL/(g h) and H2/CO2 = 4.
• Stable performance for 80 hours was observed, with near-equilibrium CO2 conversion (approx. 60%) at 600 °C and 60,000 mL/(g h) (H2/CO2 = 4), despite minor surface area reduction.

Conclusions:

• The synthesized CuO/γ-Al2O3 catalyst is highly effective for CO2 conversion to CO.
• The catalyst exhibits excellent stability and selectivity, even under demanding reaction conditions.
• This material shows significant potential for efficient and selective CO generation from CO2.