fig4

Figure 4. Properties and performance of Ru/MnCo₂O₄-X, Ru/TiO₂ and Ru/Al₂O₃, etc. (A) Temperature changes of Ru/MnCo₂O₄-2, MnCo₂O₄, Ru/TiO₂ and Ru/Al₂O₃ (50 mg of catalysts mixed with 1.2 g of quartz sands) under visible light irradiation (420-780 nm, 12,500 W m^-2) (B) Induced electric field distributions for Ru/TiO₂ and Ru/MnCo₂O₄ under light irradiation with a wavelength of 420 nm and intensity of 12,500 W m^-2. (C) production rate and selectivity for samples. (D) activity energy calculated with Arrhenius equation for CH₄ formation over Ru/MnCo₂O₄-2. (E) Methane production rate for different Ru loading samples at various temperatures. Reproduced with permission from Ref.^[54].