Provided is a catalyst device that makes it possible to efficiently purify exhaust gas. A catalyst device that comprises: a carrier that is formed by stacking and rolling a metal-foil-shaped flat plate and a metal-foil-shaped corrugated plate and that carries a catalyst; and an outer cylinder that houses the carrier and supports the carrier such that one end part of the carrier is oriented toward an exhaust gas upstream side and another end part of the carrier is oriented toward an exhaust gas downstream side. The flat plate and the corrugated plate have a plurality of holes and are covered by a coating film that includes a catalyst substance. The coating film that covers the downstream side of the holes is thicker than the coating film that covers the upstream side of the holes.

A decomposition reactor tube (DRT) for converting a reductant into ammonia includes an internal structure including a high-thermal conductivity material having a thermal conductivity greater than 20 W/(m.Math.K), wherein the internal structure is at least one of the splash plate, a splash plate frame, a double wall, an outer wall, a mixer, and/or an exhaust assist port.

A novel catalyst constituent material for combustion gas purification, which has an extremely good ratio of contact between each catalyst metal particle and an exhaust gas; and catalyst device which uses this catalyst constituent material for combustion gas purification; and a method for producing this catalyst constituent material for combustion gas purificaton. The catalyst constituent obtained by mixing catalyst metal particles and a pore-forming material that disappears at high temperatures into a catalyst supporting material which is a slurry containing fine ceramic particles. The pore-forming material also contains long fibers of cellulose nanofibers and/or short fibers of cellulose nanofibers.

Methods and systems are provided for emissions control of a vehicle. In one example, an emissions treatment device includes a porous substrate and a catalytic washcoat disposed thereon, the catalytic washcoat having nickel and no other metal. The porous substrate may be configured to filter particulate matter (PM) exiting the vehicle and the catalytic washcoat may be configured to oxidize at least a portion of the PM. The nickel in the catalytic washcoat may provide additional oxygen storage capacity and increased tolerance to sulfur poisoning of catalytic activity of the catalytic washcoat, further promoting PM oxidation. Moreover, because the catalytic washcoat may increase PM oxidation during passive regeneration events, a total number of active regeneration events may be decreased and fuel economy may be maintained.

A heating device includes a heating element in the form of a metal foam, and a case defined by a side wall that extends along a longitudinal axis. The metal foam is housed in the case. An electrical thermal insulator is arranged between the metal foam and the case. The heating device includes at least one electrode and the metal foam includes a zone configured to receive the at least one electrode.

A stainless steel foil having a chemical composition comprising, by mass %, C: 0.015% or less, Si: 0.50% or less, Mn: 0.50% or less, P: 0.040% or less, S: 0.010% or less, Cr: 10.0% or more and less than 16.0%, Al: 2.5 to 4.5%, N: 0.015% or less, Ni: 0.05 to 0.50%, Cu: 0.01 to 0.10%, Mo: 0.01 to 0.15%, at least one selected from the group consisting of Ti: 0.01 to 0.30%, Zr: 0.01 to 0.20%, Hf: 0.01 to 0.20%, and REM: 0.01 to 0.20%, where Ti+Zr+Hf+2REM≥0.06 and 0.30≥Ti+Zr+Hf are satisfied.

An exhaust gas purification device comprises a first heating element made from an electrically conductive material, a second heating element made from an electrically conductive material, and a power supply configured to circulate an electric current in the first heating element and in the second heating element. The power supply comprises a first electrode electrically connected to the first heating element and a second electrode electrically connected to the second heating element. The heating device includes a substrate extending between the first heating element and the second heating element, and a connecting element electrically connecting the first heating element and the second heating element.

An exhaust gas purification apparatus includes a three-way catalyst. The three-way catalyst includes a downstream catalyst layer and an upstream catalyst layer. The downstream catalyst layer is to be provided in an exhaust pipe. The downstream catalyst layer contains a noble metal material containing at least one of Pd, Rh, or Pt, and an OSC material containing at least ceria. The upstream catalyst layer is to be provided in the exhaust pipe closer to an engine than the downstream catalyst layer is. The upstream catalyst layer contains the noble metal material and the OSC material. The upstream catalyst layer contains the ceria at a content less than a content of the ceria in the downstream catalyst layer.

An exhaust gas purification apparatus provided to purify the exhaust gas of an engine includes: an exhaust line through which exhaust gas discharged from the engine passes, a diesel oxidation catalyst (DOC) installed in the exhaust line to purify hydrocarbons (HC) and carbon monoxide (CO) in the exhaust gas, a urea injector for spraying a urea aqueous solution inside the exhaust line, and a selective catalyst reduction (SCR) for reducing nitrogen oxides (NOx) of exhaust gas that has passed through the DOC using the urea aqueous solution. In particular, the DOC includes a cerium-zirconium oxide (CeZrOx) catalyst.

A novel catalyst constituent material for combustion gas purification, which has an extremely good ratio of contact between each catalyst metal particle and an exhaust gas; and a catalyst device which uses this catalyst constituent material for combustion gas purification; and a method for producing this catalyst constituent material for combustion gas purification. The catalyst constituent obtained by mixing catalyst metal particles and a pore-forming material that disappears at high temperatures into a catalyst supporting material, which is a slurry containing fine ceramic particle. The pore-forming material also contains long fibers of cellulose nanofibers and/or short fibers of cellulose nanofibers.