Multiple washcoats on filter substrate

An integrated multi-functional catalyst system comprising:

• a diesel particulate filter having an inlet side for receiving flow and an opposite outlet side;
• a substrate in the diesel particulate filter having an interior wall surface and an exterior wall surface;
• a first washcoat layer applied to the interior wall surface and adjacent the inlet side;
• a second washcoat layer applied to the exterior wall surface and adjacent the outlet side, wherein flow distribution through the substrate is dispersed for minimizing back pressure;
• and,
• wherein the first washcoat layer contains an NOx adsorber function.

An integrated multi-functional catalyst system comprising:

• a diesel particulate filter having an inlet side for receiving flow and an opposite outlet side;
• a plurality of honeycomb cells within the diesel particulate filter, wherein alternating exit channels are blocked at the inlet side and alternating inlet channels are blocked at the opposite outlet side;
• a substrate for each of the inlet channels, each substrate having an interior wall surface and an exterior wall surface;
• a first washcoat layer disposed on a portion of the interior wall surface, wherein the portion is less than the entire length of the interior wall surface;
• and,
• a second washcoat layer, containing a different function than the first washcoat layer disposed on a portion of the exterior wall surface, wherein the portion is less than the entire length of the exterior wall surface.

A method of manufacturing an integrated multi-functional catalyst system, the method comprising:

• providing a diesel particulate filter having an inlet side for receiving flow and an opposite outlet side;
• providing a substrate in the diesel particulate filter having an interior wall surface and an exterior wall surface;
• applying a first washcoat layer to a portion of the interior wall surface wherein the portion is less than the entire length of the interior wall surface;
• and,
• applying a second washcoat layer, containing a different function than the first washcoat layer, to a portion of the exterior wall surface, wherein the portion is less than the entire length of the exterior wall surface.

An integrated multi-functional catalyst system comprising:

• a diesel particulate filter;
• a substrate disposed within the diesel particulate filter, wherein the substrate comprises a wall;
• a first washcoat layer disposed a first length at the wall;
• and,
• a second washcoat layer disposed a second length at the wall, wherein the first length is greater than the second length.

An integrated multi-functional catalyst system comprising:

• a diesel particulate filter;
• a substrate disposed within the diesel particulate filter, wherein the substrate comprises a wall;
• a first washcoat layer disposed at the wall;
• a second washcoat layer disposed at the wall;
• and,
• a third washcoat layer disposed at the wall.