SCR Coated DPF for Marine Engine Applications
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The combination of a catalytic coating for selective catalytic reduction (SCR) and a diesel particulate filter (DPF) obtains the simultaneous reduction of NOX and particulate matter in a compact exhaust after-treatment system (EATS). A diesel oxidation catalyst (DOC), which is installed upstream to the SCR coated DPF (SDPF), provides the required NO2 for the passive soot regeneration. The layout of this EATS is state of the art for automotive applications. However, the requirements of a marine application, especially the high sulfur resistance, result in a significant development effort. It has been observed that the combination of vanadium-based coatings and DPF substrates made of cordierite lead to a significant deterioration of the SCR performance after different aging procedures. Contrary to this, the combination of DPFs, which consist of silicon carbide, and vanadium-based coatings, reveals a sufficient NOX reduction after aging in addition to the required sulfur resistance. Furthermore, the investigated DOC systems provides a remarkable NO2 generation, which enables the passive soot regeneration in the SDPF system, while using marine distillate fuels with a sulfur content up to 5000 ppm.
KeywordsAfter-treatment system Marine application SDPF CRT Sulfur resistance Hydrothermal stability
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 634135.
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