A composite structure, exhaust aftertreatment system, and method of manufacture. The composite structure includes a body that includes an array of intersecting walls that form a plurality of channels extending in an axial direction through the body such that adjacent channels are located on opposite sides of each wall. A composite material of the body includes a first phase of a porous glass or ceramic containing material. The first phase includes an internal interconnected porosity. A second phase of an electrically conductive material is included that is a continuous, three-dimensional, interconnected, electrically conductive phase at least partially filling the internal interconnected porosity of the first phase, which creates an electrical path through at least some of the walls in a lateral direction perpendicular to the axial direction between the opposite sides of the walls.

An ammonia adsorption catalyst and a preparation method and a use thereof, where the ammonia adsorption catalyst includes a substrate and an adsorption layer located on the surface of the substrate, and the adsorption layer includes a noble metal-containing zeolite adsorption material. The catalyst has the advantages of high ammonia adsorption/conversion efficiency, low cost, and flexible application, etc.

The exhaust gas-purifying catalyst of the invention contains oxide particles having interdispersed therein A crystallites that are loaded with a noble metal and B crystallites that are not loaded with a noble metal. The A crystallites loaded with a noble metal are composed of an oxide containing at least one of zirconium (Zr) and cerium (Ce). The B crystallites not loaded with a noble metal are composed of a cerium (Ce)-containing oxide which has a higher Ce content (mol %) than the oxide making up the A crystallites. The oxide particles have a specific surface area after 5 hours of heat treatment at 1,150° C. in open air of 30 m.sup.2/g or more.

An apparatus for purifying an exhaust gas passing through an exhaust pipe includes a catalytic converter disposed on the exhaust pipe. The catalytic converter is provided with a lean NOx trap (LNT) device, the LNT device having an LNT catalyst coated therein, and a catalyzed particulate filter (CPF), the CPF having a catalyst coated therein, and the LNT device and the CPF are sequentially disposed in the catalytic converter. The CPF includes at least one inlet channel extending in a longitudinal direction, the at least one inlet channel having a first end into which fluid flows and a second end which is blocked, at least one outlet channel extending in the longitudinal direction, the at least one outlet channel having a first end which is blocked and a second end through which the fluid flows out, at least one porous wall that defines a boundary between neighboring inlet and outlet channels and that extends in the longitudinal direction, and a support with the catalyst coating thereon, and the support is located within at least one among the at least one inlet channel and the at least one outlet channel.

A NO.sub.x adsorber catalyst and its use in an emission treatment system for internal combustion engines, is disclosed. The NO.sub.x adsorber catalyst comprises a first layer consisting essentially of a support material, one or more platinum group metals disposed on the support material, and a NO.sub.x storage material.

The present invention relates to a catalytic material for treating an exhaust gas produced by a natural gas engine, which catalytic material comprises a molecular sieve and a platinum group metal (PGM) supported on the molecular sieve, wherein the molecular sieve has a framework comprising silicon, oxygen, titanium and optionally germanium, and has a content of non-titanium heteroatom T-atoms of ≤ about 0.20 mol %, wherein the titanium is present in an amount of from 1 to 3 mol %. The present invention further relates to a catalyst article and to a compressed natural gas combustion and exhaust system.

A catalytic converter with excellent OSC performance and NO.sub.x purification performance. The converter includes a substrate with a cell structure through which exhaust gas flows, and a catalyst layer formed on a cell wall surface of the substrate. The catalyst layer includes a lower catalyst layer and an upper catalyst layer, the lower catalyst layer being formed on a surface of the substrate, and the upper catalyst layer being formed on a surface of the lower catalyst layer. The upper catalyst layer includes at least a zirconia support with rhodium carried thereon, and two types of ceria-zirconia-based composite oxides with different specific surface areas, each of the ceria-zirconia-based composite oxides having no rhodium carried thereon. The lower catalyst layer includes an alumina support with platinum carried thereon, and a ceria-zirconia-based composite oxide.

The object of the present invention is to provide an exhaust gas purifying catalyst that can achieve high purification performance while suppressing H.sub.2S emissions. The object is solved by an exhaust gas purifying catalyst in which the top layer of a catalyst coating layer comprises a ceria-zirconia composite oxide having a pyrochlore-type ordered array structure, in which the ceria-zirconia composite oxide contains at least one additional element selected from the group consisting of praseodymium, lanthanum, and yttrium at 0.5 to 5.0 mol % in relation to the total cation amount, and the molar ratio of (cerium+additional element):(zirconium) is within the range from 43:57 to 48:52.

The exhaust gas purification device includes a substrate, a first catalyst layer, and a second catalyst layer. The substrate includes an upstream end, a downstream end, and a porous partition wall defining a plurality of cells extending between the upstream end and the downstream end. The plurality of cells include an inlet cell opening at the upstream end and sealed at the downstream end, and an outlet cell adjacent to the inlet cell sealed at the upstream end and opening at the downstream end. The first catalyst layer is disposed on a surface of the partition wall in an upstream region. In a downstream region, the second catalyst layer is disposed inside the partition wall, and a second catalyst-containing wall including the partition wall and the second catalyst layer has a porosity of 35% or more.

An exhaust purification device includes an adding valve that adds an additive to exhaust gas. A first partition plate includes a first hole-formation region, which includes a main flow hole extending through a central portion and sub-flow holes surrounding the main flow hole, and a first hole-free region surrounding the first hole-formation region. A second partition plate located at a downstream side of the first partition plate includes a second hole-free region, which includes a portion overlapping the main flow hole, and a second hole-formation region surrounding the second hole-free region. An injector injects the additive in a circumferential direction of the first hole-free region from a position opposing the first hole-free region in the extending direction and opposing a projection of the first hole-formation region in a cross-sectional direction.