Diesel oxidation catalysts, systems and methods of treatment

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, the catalytic article further comprising an undercoat washcoat layer comprising substantially no platinum group metal, the undercoat washcoat layer positioned between the substrate and the first washcoat layer.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the promoter is in solid solution with the non-zeolite support.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the non-zeolite support is alumina.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the first platinum group metal comprises a mixture of platinum and palladium.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the promoted non-zeolite support is promoted with a promoter comprising manganese and indium.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the promoter comprises manganese in an amount up to about 1 g/in3, iridium in an amount up to about 0.01 g/in3 and indium in an amount up to about 0.1 g/in3.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the promoter comprises less than or equal to about 0.17 g/in3 manganese, less than or equal to about 0.0035 g/in3 iridium and greater than or equal to about 0.067 g/in3 indium.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the promoter comprises tin in an amount up to about 0.2 g/in3, indium in an amount up to about 0.2 g/in3 and iridium in an amount up to about 0.01 g/in3.

A catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof, wherein the substrate comprises a wall flow monolith having a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages.

A method of treating an exhaust gas stream emitted by a diesel engine comprising passing the exhaust gas stream through a catalytic article comprising a substrate having a first washcoat layer comprising a first platinum group metal comprising platinum impregnated on a non-zeolite support promoted with a promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof.

An exhaust treatment system comprising:

• a diesel engine;
• and
• a diesel oxidation catalyst disposed downstream of and in flow communication with the diesel engine, the diesel oxidation catalyst comprising a substrate with a first washcoat layer disposed on the substrate, the first washcoat layer comprising a platinum group metal comprising platinum impregnated on a promoted non-zeolite support, the promoter being selected from the group consisting of tin, manganese, indium, group VIII metal and combinations thereof.