Efficient Decomposition of Ozone at Room Temperature by Cobalt-Organic ZIF-67 Nanostructure and Its Derivatives

Catalytic decomposition of indoor ozone under high humidity conditions is a challenging and significant task. Co 2+ –centered ZIF-67 was used as the precursor material in this study, and the effect of metal–organic frameworks carbonization and secondary doping of transition metals on the activity was systematically investigated. Accordingly, the CoMn–NC catalyst exhibited a superhigh ozone conversion of 98.9% within 10 h at a concentration of 40 ppm of O 3, relative humidity of 50%, and weight hourly space velocity of 360,000 mL/(g·h). The Co 0 cores in the nanoparticles and Co–N 2 centers generated during the carbonation process synergistically decompose ozone. The synergistic effect of Mn and Co can readily transfer electrons through the redox cycle, under the high surface oxygen conditions. The unique structure, a greater number of defect centers, and stronger peroxide desorption capability enable the catalyst to effectively avoid nanoparticle agglomeration and maintain relatively high activity over a long period of time.