Selective catalytic reduction of NO by alcohols on Co- and Fe-Siβ catalysts

Co–Siβ and Fe–Siβ catalysts prepared by a two-step post-synthesis method were characterised by EPR, diffuse reflectance UV–vis, XRD and N2-physisorption. Iron and cobalt ions are present as isolated lattice tetrahedral CoII and FeIII species for low metal contents (0.7 and 0.9 wt.%, respectively). For higher iron content, FeOx oligomers appear. Zeolites with isolated CoII and FeIII species are active in selective catalytic reduction of NO with ethanol. On FeOx oligomers the oxidation of NO to NO2 starts to dominate in the selective catalytic reduction of NO with ethanol at the temperatures higher than 700 K.