Catalytic Conversion of Multipollutants (Hg⁰/NO/Dioxin) with V₂O₅–WO₃/TiO₂ Catalysts

Abstract

A multipollutant (Hg0/NO/dioxin)-containing gas-stream-generating system is developed to investigate the effectiveness of V2O5–WO3/TiO2 catalyst for multipollutant control. The results indicate that plate-type 1.52 wt% V2O5 performs much better than two other catalysts for oxidizing Hg0. With a higher vanadium loading of 1.52 wt% V2O5, higher Hg0 conversions (53–75%) are observed compared to 0.66 wt% V2O5 (45–68%) and 0.26 wt% V2O5 (32–63%) for simulated flue gas streams. In addition, the mercury oxidation activity significantly increases with increasing concentration of hydrogen chloride. For removal of PCDD/Fs, the results show that the removal efficiencies of PCDD/F congeners achieved with V2O5–WO3/TiO2 range from 50% to 65%. It is observed that the removal efficiency of highly chlorinated PCDD/Fs is slightly higher than that of low-chlorinated PCDD/Fs. Overall, plate-type catalyst of 1.52 wt% V2O5 shows the highest Hg0/NO/dioxin conversion and reduction efficiency among three catalysts evaluated.