DIESEL PARTICULATE FILTER WITH IMPROVED BACK PRESSURE PROPERTIES

摘要

A diesel particulate filter is presented which includes a ceramic wall flow filter substrate and a refractory coating applied in the flow channels. The coating (6) is such that it closes the pores (5) connecting the inflow channels (1) and outflow channels (2) in the wall (4) upstream of soot particles (7) without preventing the passage of the gaseous exhaust gas constituents , The coating can be made from one or more refractory oxides or refractory fiber material. In both cases, the coating causes the depth filtration is significantly reduced and thus significantly reduced during the depth filtration phase to be observed backpressure increase.