Facile and Environmentally Friendly Synthesis of Ga2O3/CeO2 Catalysts for CO Oxidation

Low-temperature CO oxidation is crucial for applications like gas purification and exhaust treatment, with ceria-based catalysts being highly promising. However, conventional synthesis methods often require energy-intensive calcination, releasing harmful gaseous contaminants. To address this, we demonstrate a facile and environmentally friendly method for preparing Ga2O3/CeO2 catalysts by substituting gallium salt solution with liquid gallium, followed by room-temperature ball milling (BM). The resulting 1.5% Ga2O3-CeO2 catalyst, milled at 300 rpm for 60 min, exhibited catalytic activity starting at 100 °C and achieved complete CO conversion at 300 °C. This work presents an economical and sustainable strategy that utilizes liquid metals to prepare high-performance ceria-based catalysts, offering a green alternative to traditional synthesis routes that rely on metal salts and high-temperature treatments.