Synthesis of Cu 2 O Nanoparticles via Self-exothermic Reaction for Highly Efficient Ozone Decomposition

Abstract

Ground-level ozone is a typical atmospheric pollutant, making the development of efficient and stable ozone degradation technologies highly important. In this study, a self-exothermic reaction was utilized to successfully achieve kilogram-scale synthesis of nanocrystalline Cu 2 O, using high-concentration ascorbic acid aqueous solution and solid Cu(OH) 2 as the precursors.Experimental results show that when the concentration of ascorbic acid is 0.77 mol/L, the obtained catalyst exhibits an ozone conversion rate of up to 98% at 25℃ at a high space velocity of 960,000 mL/(g•hr), along with good moisture resistance and low-temperature stability. Furthermore, after processing the powder catalyst into a structured monolithic catalyst, the ozone removal rate remains above 92% at a high space velocity of 48,000/h. Characterization analyses indicate that the high catalytic activity originates from the abundant defect structures and oxygen vacancies introduced during the self-exothermic synthesis process, which significantly increases the number of active sites. This study presents a simple and efficient method for large-scale production of high-performance Cu 2 O catalysts, demonstrating broad application prospects in ozone pollution control.