Abstract
A catalytic deSoot–deNOx system, comprising Pt and Ce fuel additives, a Pt-impregnated wall-flow monolith soot filter and a vanadia-type monolithic NH3-SCR catalyst, was tested with a two-cylinder DI diesel engine. The soot removal efficiency of the filter was 98–99mass% with a balance temperature (stationary pressure drop) of 315°C at an engine load of 55%. The NOx conversion ranged from 40 to 73%, at a NH3/NOx molar ratio of 0.9. Both systems were measured at a GHSV of 52000l/(lh). The maximum NOx conversion was obtained at 400°C. The reason for the moderate deNOx performance is discussed. No deactivation was observed after 380h time on stream. The NOx emission at high engine loads is around 15% lower than that of engines running without fuel additives.
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