DIESEL PARTICLE FILTER HAVING IMPROVED BACK PRESSURE PROPERTIES

摘要

There is proposed a diesel particulate filter comprising a ceramic wall-flow filter substrate and a coating comprised of a material having a high melting point, which is applied in the inlet ducts. The coating portion 6 is formed by closing the voids 5 connecting the inlet channels 1 and the outlet channels 2 in the wall 4 on the inlet side to the soot particles 7, So as not to interfere with the passage of the components. The coating can be made from one or more oxides having a high melting point or from a fiber material having a high melting point. In both cases, the coating has the effect of drastically reducing deep filtration, thus significantly reducing the backpressure experienced during the deep filtration phase.