fig2

Figure 2. Methane photocatalytic ozonation in continuous flow reactor. (A) Methane conversion of various catalysts under different oxidation processes; (B) Variation of methane concentration under different oxidation processes over the Au/ZnO (Reaction condition: 0.5 g photocatalyst, reaction temperature of 25 ± 2 ^oC, light intensity: 16 W 254 nm UV*2, gas flow rate: 200 mL·min^-1, ozone concentration: 300 ppm); (C) Variation of methane concentration at different ozone concentrations over the Au/ZnO; (D) Cyclic tests of photocatalytic ozonation over the Au/ZnO (One cycle: 4 h; ten cycles: 40 h). UV: Ultraviolet.