Integration of Vanadium and Zeolite Type SCR Functionality into DPF in Exhaust Aftertreatment Systems - Advantages and Challenges

Soot and hydrocarbon oxidation over vanadia-based SCR catalysts

“…Sultana et al [14] furthermore reported that hydrocarbon deposits that block the active sites seem to be preferentially formed for zeolites with large pores and cages. As compared to the Cu-zeolite/DPF multifunctional option, the vanadia-based systems are favored especially for Heavy Duty Vehicles (HDV) and countries with lower emission standards due to the high sulfur resistance and high activity above 300 • C [15].…”

Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts

“…Both WO3 and MoO3 promoters improve the SCR performance of the binary V2O5/TiO2 catalyst, with the first one being more active but also less resistant to As poisoning, that is present in flue gases [13]. In addition, both catalyst formulations show potential for hydrocarbon (HC) and soot oxidation [14], which makes them promising candidates for SCR on diesel particulate filter applications (SCR-DPF) if the temperature can be kept below 550 °C [15][16][17]. Such a combination allows a faster warm-up due to the closer location to the engine.…”

Multi-catalytic soot filtration in automotive and marine applications

“…Fig. 11 from [45] shows measured NO x conversion and mean ammonia slip results from engine cold and warm world harmonized test cycles (WHTC) for Cu-SAPO-34 (Cu-DPF) and V 2 O 5 /WO 3 /TiO 2 /SiO 2 (V-DPF). Further, for comparison of warm WHTC results for the flow-through samples, Cu-ft and V-ft are included.…”