Diesel Particulate Filters

EnviCat® DPF

The exhaust of lean burn diesel engines contain particulate matter such as soot and soluble organic fractions that are a risk to both human health and the environment. These particulates are removed by installation of filter. As the pores of the filter get plugged during operation, it becomes necessary to regenerate the filters by burning of the soot. Soot can be burnt either by active/passive regeneration. In active regeneration, the uncoated DPF is regenerated periodically by injecting fuel into the hot exhaust upstream of the DOC and thus raising the temperature sufficient for the soot burnout with oxygen. This method needs catalysts that can withstand high temperature. In passive regeneration, NO2 is used to combust the soot at relatively lower temperatures than possible with oxygen. The NO2 is generated by oxidation of the NO in the exhaust gas on a upstream DOC of the filter or alternatively coated DPF (cDPF).

Sud Chemie Diesel Particulate Filters offer innovative Catalytic solutions for active and passive regeneration.

Some of the typical combinations offered are :

•     DOC + Uncoated DPF
•     DOC + Coated DPF
•     cDPF

EnviCat® DOC + uncoated DPF

These filters can be customized with an upstream DOC designed to generate adequate NO2 for soot burning on DPF. The DPF itself is uncoated. This combination is also available for active regeneration where the diesel fuel is injected upstream of the DOC to generate the temperatures required for soot burn out with oxygen.

EnviCat® DOC + cDPF

This arrangement uses a cDPF to further facilitate the in situ formation of NO2 on the filter and simultaneously burn the soot as it forms. For some applications Sud Chemie offers its proprietary cDPF coating for use as a standalone device that can overcome space limitations without compromising the conversion effeciency.

The innovative formulations are designed to attain high PM, CO and HC reduction in excess of 98% and can also dramatically reduces exhaust smoke and diesel odor.

EnviCat® cDPF coatings can be offered on advanced materials substrate in various size and shapes : Cylindrical, Rectangular and Custom shapes

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