A catalyst for cleaning exhaust gases, having a honeycomb body which configures a plurality of flow ducts through which a gas from a gas inlet side may flow in the axial direction to a gas outlet side, having an inner casing which encloses the honeycomb body having an outer casing which encloses the inner casing, and having an insulation region which is disposed between the inner casing and the outer casing. The honeycomb body, the inner casing, the outer casing and the insulation region are formed from exactly two tiers formed from metal foils that are stacked on top of one another and wound along a winding direction transverse to the axial direction.

The present disclosure provides a method of forming a selective catalytic reduction (SCR) catalyst, the method including receiving a first iron-promoted zeolite having a first iron content, and treating the iron-promoted zeolite with additional iron in an ion exchange step to form a second iron-promoted zeolite with a second iron content, the second iron content being higher than the first iron content. A selective catalytic reduction (SCR) catalyst composition including an ironpromoted zeolite having at least about 6 weight percent iron, based on total weight of the ironpromoted zeolite, wherein the iron content of the zeolite was added to the zeolite in at least two separate steps is also provided herein.

The present invention relates to a NOx storage material comprising a cerium-based mixed oxide comprising cerium, oxygen, and a first rare earth metal other than cerium, wherein said NOx storage material further comprises a second rare earth metal other than cerium; wherein said first rare earth metal is different to said second rare earth metal; and wherein said second rare earth metal is disposed or supported on the surface of the cerium-based mixed oxide.

Provided are a novel form of AFX zeolite, a novel synthesis technique for producing pure phase small pore zeolites, a novel synthesis method for producing a zeolite with an increased Al pair content, a catalyst comprising the AFX zeolite in combination with a metal, and methods of using the same.

The presently claimed invention provides a catalytic article and an exhaust gas treatment system. The catalytic article comprises platinum supported on a first support comprising ceria containing metal oxide component; rhodium supported on a second support selected from a refractory alumina component, an oxygen storage component or a combination thereof; and a substrate, wherein said catalytic article is essentially free of palladium. The presently claimed invention also provides a process for preparing the catalytic article and use of the catalytic article and the exhaust gas treatment system for purifying a gaseous exhaust stream comprising hydrocarbons, carbon monoxide, and nitrogen oxide.

A muffler is detachably attached to an engine. A catalyst for purifying exhaust gas is provided upstream of the muffler, and a secondary air valve for supplying air to an exhaust passage is provided upstream of the catalyst. The catalyst and the secondary air valve are integrally unitized. A catalyst unit including the catalyst and the secondary air valve is provided between the engine and the muffler.

A scraping device for undried joining material protruding from a segment joint body in which side surfaces of a plurality of pillar-shaped honeycomb structure segments are joined via the undried joining material, the segment joint body having an outer peripheral side surface, a first honeycomb-shaped end surface, and a second honeycomb-shaped end surface located on an opposite side of the first honeycomb-shaped end surface, the scraping device includes a stand for placing the segment joint body; a controller; and a scraping robot comprising at least one scraping spatula configured to be movable in at least one scraping direction along at least one surface of the outer peripheral side surface, the first honeycomb-shaped end surface, and the second honeycomb-shaped end surface while being pressed against the at least one surface.

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.

An electric heating type support includes: a pillar shaped honeycomb structure being configured to a ceramic, including: an outer peripheral wall; and partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the cells extending from one end face to other end face to form a flow path; at least one electrode layer disposed on a surface of the outer peripheral wall of the pillar shaped honeycomb structure; and at least one electrode connecting portion provided on the at least one electrode layer, the at least one electrode connecting portion being connectable to a metal connector. The at least one electrode connecting portion has at least one independent rising portion, and a height of the at least one electrode connecting portion from a surface of the at least one electrode layer is from 1 to 6 mm.

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.