An oxidation catalyst for treating an exhaust gas from a diesel engine, which oxidation catalyst comprises: a first washcoat region comprising platinum (Pt), manganese (Mn) and a first support material; a second washcoat region comprising a platinum group metal (PGM) and a second support material; and a substrate having an inlet end and an outlet end; wherein the second washcoat region is arranged to contact the exhaust gas at the outlet end of the substrate and after contact of the exhaust gas with the first washcoat region.

A diesel-emissions reduction unit having an inlet adapted to receive an exhaust stream of the diesel engine; a diesel oxidation trap catalyst located adjacent the inlet; a dosing controller and an injection lance arranged to meter aqueous NH.sub.3 into the exhaust stream; a NOx concentration sensor and a NH.sub.3 concentration sensor with at least one oxidation catalyst panel arranged to isolate the NOx concentration sensor from NH.sub.3 in the exhaust stream; and an exhaust heater arranged to heat the exhaust stream of the diesel engine toward the inlet of the diesel emissions reduction unit.

The present invention relates to a three-way catalyst (TWC) for treatment of exhaust gases from internal combustion engines operated with a predominantly stoichiometric air/fuel ratio, so called spark ignited engines.

A ceramic filter having a pillar-shaped honeycomb structure, wherein when observing a plurality of pores from a surface of partition walls with a laser microscope and plotting an equivalent circle diameter (μm) of each pore on an X-axis and a pore depth (μm) of each pore on a Y-axis on a two-dimensional coordinate system, a slope of a regression line (y/x) obtained by a least squares method in a range of 20≤x≤40 is 0 to 0.20, an average value of the pore depth of the plurality of pores is 2.5 μm to 5.0 μm, and a number density of the plurality of pores is 600/mm.sup.2 to 2450/mm.sup.2.

The invention relates to a catalytic converter for treating exhaust gases of an internal combustion engine, having a housing through which an exhaust gas may flow and which has an inflow side and an outflow side, wherein, in the housing, there is formed a plurality of flow channels (4, 13) which is flowed through along a main throughflow direction from the inflow side to the outflow side, wherein, in the housing, there is arranged at least one pipeline (5, 12) which is flowed through by a fluid which is independent of the exhaust gas that is caused to flow through the flow channels (4, 13).

Provided is an exhaust gas purification catalyst having an improved catalyst performance while securing an OSC in an air-fuel ratio (A/F) rich atmosphere where HC poisoning is likely to occur. The present disclosure relates to an exhaust gas purification catalyst including a substrate and a catalyst coating layer coated on the substrate. The catalyst coating layer has an upstream coat layer formed from an end portion in an upstream side with respect to an exhaust gas flow direction in the exhaust gas purification catalyst and a downstream coat layer formed from an end portion in a downstream side with respect to the exhaust gas flow direction in the exhaust gas purification catalyst. The downstream coat layer includes Rh as a catalytic metal, alumina-ceria-zirconia complex oxide, and alkaline earth metal.

An electric heating type carrier including a conductive honeycomb structure portion and a pair of electrode layers, wherein in a cross-section orthogonal to the direction in which the cells extend, the honeycomb structure portion is classified into following three regions: a first resistance region having a contact portion with a first electrode layer, a second resistance region having a contact portion with a second electrode layer, and a third resistance region that does not come into contact with either the first electrode layer or the second electrode layer, and traverses the cross-section so as to be sandwiched between the first resistance region and the second resistance region, and has a higher electrical resistance per unit volume (1 cm.sup.3) than an electrical resistance per unit volume (1 cm.sup.3) of the first resistance region and the second resistance region.

A catalytic device that can increase the durability of a catalyst support with holes is provided. A flat plate and a corrugated plate have a plurality of holes, a joint area between the flat plate and the corrugated plate is provided in a first upstream area including one end of a catalyst support, and a joint area between the catalyst support and an outer cylinder is provided in a second upstream area that includes the first upstream area and is wider than the first upstream area in the direction of an axis.

A pillar shaped honeycomb structure including pillar shaped honeycomb segments joined together via joining material layers, wherein each of the pillar shaped honeycomb segment includes: an outer peripheral wall; and a porous partition wall disposed on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells, each of the plurality of cells extending from one end face to other end face to form a flow path, wherein a joining material forming the joining material layers includes magnetic particles, and wherein the joining material contains aggregates, and at least a part of the aggregates comprises the magnetic particles.

A pillar shaped honeycomb structure includes: an outer peripheral wall; and a porous partition wall disposed on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells, each of the plurality of cells extending from one end face to the other end face to form a flow path. The partition wall is a porous body containing aggregates and binding materials binding the aggregates. At least a part of the aggregates includes magnetic particles.