Effect of the Mn oxidation state and lattice oxygen in Mn-based TiO₂ catalysts on the low-temperature selective catalytic reduction of NO by NH₃

Figures & data

Figure 1. Effect of calcination temperature on surface area, pore volume, and pore diameter of the Mn/TiO₂ catalysts.

Figure 2. X-ray diffraction patterns of the Mn/TiO₂ catalysts with different calcination temperatures (A = anatase TiO₂; R = rutile TiO₂).

Figure 3. H₂-TPR profiles of the Mn/TiO₂ catalysts with different calcination temperatures.

Figure 4. NH₃-TPD profiles of the Mn/TiO₂ catalysts with different calcination temperatures using TCD.

Figure 5. NH₃-TPD profiles of the Mn/TiO₂ catalysts with different calcination temperatures using mass spectrum. (A) Investigation of NH₃, O₂ and H₂O; (B) investigation of N₂, NO, N₂O, and NO₂ (color figure available online).

Figure 6. NO-TPD spectra of the Mn/TiO₂ catalysts with different calcination temperatures using mass spectrum. (A) Investigation of NO; (B) investigation of NO₂.

Figure 7. Oxidation activity of NO to NO₂ by O₂ on the Mn/TiO₂ catalysts with different calcination temperatures. (Reaction condition: 200 ppm NO, 8% O₂, 6% H₂O, GHSV = 60,000 hr⁻¹).

Figure 8. NO_x conversion of the Mn/TiO₂ catalysts with different calcination temperatures. (Reaction condition: 200 ppm NO_x, 8% O₂, 6% H₂O, NH₃/NO_x = 1, GHSV = 60,000 hr⁻¹).