Achieving multiple pollutants control via SCR process: efficacy of VMT catalyst

Simultaneous removal of multiple pollutants from industrial emissions offers significant cost and space savings when upgrading air pollution control devices. Sintering processes emit complex pollutant mixtures including SO_x, NO, volatile organic compounds (VOCs), and dioxins (PCDD/Fs). This study evaluates the simultaneous removal of NO, PCDD/Fs, and toluene using three commercial V₂O₅-MoO₃/TiO₂ (VMT) selective catalytic reduction (SCR) catalysts, under simulated flue gas conditions at 220 °C. The catalysts designated Cat-1, Cat-2, and Cat-3 differed in composition, including variations in MoO₃, V₂O₅, and the addition of SiO₂ or WO₃. The effects of H₂O_(g) and SO₂ were also evaluated to assess catalyst stability and resistance to poisoning. Cat-1, with the highest MoO₃ content, achieved the best overall performance with removal efficiencies of 93.1% for PCDD/Fs, 83.3% for NO, and 84.6% for toluene. Cat-2, containing sulfur-resistant SiO₂ and WO₃, demonstrated superior NO and PCDD/Fs removal in the presence of H₂O_(g) and SO₂. Cat-3, with the highest V₂O₅ content, exhibited the highest NO conversion when H₂O_(g) and SO₂ were absent, and its performance was minimally affected by co-pollutants. This work confirms the efficacy of VMT catalysts for multipollutant control, highlighting their potential for industrial applications.