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To reach the EPA ‘10 and Euro VI strict regulations of PM and NOx for heavy duty trucks it will be necessary to apply integrated catalytic solutions for removal of both PM and NOx. The described system consists of an alternative catalytic configuration where the SCR catalyst is placed downstream of the diesel engine followed by diesel injection over an oxidation catalyst (DOC) and a catalysed diesel particulate filter (cDPF). One of the advantages of this system configuration is that the SCR catalyst in this way is protected from high temperatures during filter regeneration and that the SCR catalyst has the fastest heat up required for good performance in cold test cycles. The SCR catalyst can therefore be of a standard V-based type that is already proven technology for Euro IV and Euro V compliance in Europe. Another advantage is that the DOC and cDPF act as clean-up catalysts for any possible ammonia slip from the SCR catalyst.

To reach the very strict Euro VI regulations of PM and NOx for heavy-duty trucks, it will be necessary to apply integrated catalytic solutions for removal of both PM and NOx. The most cost-effective solution would be to base the Euro VI system on Euro IV/V base engines, without EGR, and apply a high efficiency aftertreatment system, able to reduce the NOx from the common 7-8 g/kWh down to the Euro VI level at 0.4 g/kWh. The described system consists of a catalytic configuration, where the SCR catalyst is placed directly downstream of the diesel engine followed by an ammonia slip catalyst (ASC) and diesel injection over an oxidation catalyst (DOC) and a catalyzed diesel particulate filter (cDPF).