Conventional and New Materials for Selective Catalytic Reduction (SCR) of NO_x

It is important and necessary to minimize NO_x pollutant released into the atmosphere owing to the harmful environmental and health effects brought by NO_x emission. Many techniques are available to reduce NO_x emission, among of them, Selective Catalytic Reduction (SCR) is considered as one of the most efficient techniques. Conventional SCR systems involve ammonia (NH₃) or urea (CO(NH₂)₂) as a reducing reagent to reduce NO_x to N₂ and H₂O at high temperatures 300–400 °C. Research on developing novel low-temperature catalysts (LTC) for SCR of NO_x still remains of interest. This work reviewed and compared conventional SCR catalysts with newly emerging Metal-Organic-Frame (MOFs) materials as potential alternatives for SCR catalysts.