Efficient ozone decomposition over bifunctional Co_(3)Mn-layered double hydroxide with strong electronic interaction

摘要

Ground-level ozone is one of the primary pollutants detrimental to human health and ecosystems.Catalytic ozone decomposition still suffers from low efficiency and unsatisfactory stability.In this work,we report a manganese-based layered double hydroxide catalyst(Co_(3)Mn-LDH),which exhibited a superior ozone decomposition performance with the efficiency of 100% and stability over 7 h under a GHSV of 2,000,000 mL g^(-1)h^(-1) and relative humidity of 15%.Even when the relative humidity increased to 50%,the ozone decomposition also reached 86%,which significantly exceeds as-synthesized MnO_(2) and commercial MnO_(2) in performance.The catalytic mechanism was studied by H_(2)-TPR,FT-IR and XPS.The excellent performance of Co_(3)Mn-LDH can be attributed to its abundant surface hydroxyl groups that ensured the preferentially surface enrichment of ozone,as well as the cyclic dynamic replenishment of electrons between multivalent Co^(2+)/Co^(3+),Mn^(2+)/Mn^(3+)/Mn^(4+)and oxygen species that endowed the stable ozone decomposition.This work offers new insights into the design of efficient catalysts for ozone pollution control.