Investigation of the selective catalytic reduction of NO by NH3 on Fe-ZSM5 monolith catalysts

Effect of Oxygen Concentration in NH₃-SCR Reaction over Fe- and Cu-loaded Beta Zeolites

“…The presence of NH3 suppressed the oxidation of NO to NO2, leading to reduction in the NH3-SCR activity, with the apparent reaction order of NH3 being zero or of negative order. The inhibition effect of NH3 strongly indicates the possibility of NH3 adsorption onto the active sites 5), 9) , the reduction of a loaded metal 10) , or NH3 oxidation 6) . On the other hand, for Cu-loaded zeolite catalysts, several ratedetermining steps were proposed, such as NO oxidation to NO2 1), 11) , oxidative adsorption of NO 12) , or oxidation of Cu to Cu 2 13) .…”

VOx Surface Coverage Optimization of V2O5/WO3-TiO2 SCR Catalysts by Variation of the V Loading and by Aging

“…The gas hourly space velocity (GHSV = volumetric gas flow/coated monolith volume) was 50,000 h −1 , which is typical of SCR converters of diesel vehicles [39]. The maximum NOx reduction activity was measured by dosing NH3 in excess, i.e.…”

“…The washcoated monoliths were tested in a laboratory test reactor described elsewhere [34,39] under a feed of 10 vol% O2, 5 vol% H2O, 500 ppm NO, 0-600 ppm NH3 with balance N2, in order to mimic realistic exhaust gas composition. The gas hourly space velocity (GHSV = volumetric gas flow/coated monolith volume) was 50,000 h −1 , which is typical of SCR converters of diesel vehicles [39].…”

Using temporal analysis of products and flux response technology to determine diffusion coefficients in catalytic monoliths

“…Monolith supported catalysts are widely used in both the automotive industry as catalytic converters, as well as in the bulk and fine chemicals industries (Deutschen et al, 2000;Kröcker et al, 2006). Monoliths are employed to reduce external mass transfer resistance and to reduce the pressure drop over the catalyst (Zhang et al, 2004).…”