ECO-NOx SCR based systems may include one or more layers of an oxidative catalyst (CatOx), which also makes it possible to efficiently remove CO and a significant portion of any unburned hydrocarbons. CatOx installed downstream of the SCR is also useful in minimizing any ammonia slip.
The ECO-NOx™ SCR systems employ DeNOx and CatOx catalysts produced by the Danish company Haldor Topsøe SA. These catalysts are based on a ceramic fiber porous support that is reinforced with titanium dioxide (TiO2) and are homogeneously impregnated with the active components Tungsten Trioxide (WO3) and Vanadium Pentoxide (V2O5), respectively.