Selective catalytic reduction of NO with NH₃ over V-MCM-41 catalyst

V-MCM-41, a mesoporous catalyst doped with V₂O₅, was applied for the first time to the removal of atmospheric NO. The quantity of V₂O₅ added was 10 wt% and 30 wt%. The characteristics of the synthesized catalysts were examined using XRD, N₂ soprtion, and NH₃-TPD. With increasing quantity of V₂O₅ added, specific surface area decreased and pore size increased. When the quantity of V₂O₅ was 10 wt%, the MCM-41 structure was retained, whereas considerable collapse of mesoporous structure was observed when 30 wt% V₂O₅ was added. The examination of acid characteristics using NH₃-TPD showed that 30 wt% V-MCM-41 had the higher NH₃ adsorption ability, implying that it would exhibit high activity for NH₃ SCR reaction. In the NO removal experiments, 30 wt% V-MCM-41 showed much higher NO removal efficiency than 10 wt% V-MCM-41, which was attributed to its high NH₃ adsorption ability.