Development of an Integrated NOx and PM Reduction Aftertreatment System: SCRi™ for Advanced Diesel Engines

Abstract

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SCR and SCRi® as After-treatment Systems for Low CO2 and Low NOx Vehicles

“…Fig. 4 and 5 show results of previous studies [12] that a 30% volume reduction could be gained with the use of the structured 300/600 cpsi LS/PE NOx reduction catalyst in comparison with the standard extruded 300 cpsi SCR catalyst. Furthermore, a lower NH 3 slip has been achieved.…”

“…In Europe catalyst technologies currently used are extruded catalysts or coated substrates with vanadium pentoxide as the catalytically active component. [12].…”

“…SCRI ® TECHNOLOGY SCRi ® technology was developed to reduce soot particle emissions in the exhaust gas with the integration of a partial-fl ow deep-bed fi lter PM METALIT ® in front of the reduction catalyst. The basic principle of SCRI ® system is described in the earlier literature [12,13]. Fig.…”

Soot Modeling for Advanced Control of Diesel Engine Aftertreatment

“…;co + (1 - (4) The temperature dependence of CO catalytic selectivity/co is of the following form (Eq. (5)):…”

“…To that aim, the development of low back pressure and efficient aftertreatment systems has been of major importance. Moreover, to comply at the same time with strict PM and NOx limits, state of the art exhaust systems, including DPF (diesel particulate filters) and SCR (.selective catalytic reduction) [3,4,5], need to be integrated with engine controls to exploit as much as possible their interaction, and also to minimize fuel and urea consumptions. In order to achieve the real goal of developing more efficient diesel engines, the correct integration of the different devices during the design, operation, and even failure processes, is extremely important [6], Among all the cited devices, the DPF has the worse effect on engine backpressure and fuel consumption penalties.…”