A method for purifying the exhaust gas generated by an internal combustion engine, wherein the exhaust gas generated by the internal combustion engine is conducted through an exhaust gas path in which at least one adsorption element is arranged, to which pollutants contained in the exhaust gas at least partly bind, and in which the at least one adsorption element is regenerated by at least partial desorption of the bound pollutants, and pollutants desorbed from the at least one adsorption element during the desorption process are stored in at least one storage unit.

An exhaust purification system includes an LAF sensor provided in an exhaust pipe and generates a signal corresponding to an air-fuel ratio of exhaust gas. An upstream catalytic converter is downstream of the LAF sensor and has a catalyst to purify the exhaust gas. An O2 sensor is downstream of the upstream catalytic converter, and generates a signal corresponding to the air-fuel ratio of the exhaust gas. A GPF is downstream of a the O2 sensor and purifies the exhaust gas. An ECU controls an air-fuel mixture in an engine using output signal KACT of the LAF sensor and an output signal VO2 of the O2 sensor such that the air-fuel ratio of exhaust gas flowing into the GPF converges to a target value near the stoichiometric ratio. The GPF has a filter substrate and a downstream TWC supported by a partition of the filter substrate.

An object of the present invention is to provide an exhaust gas purification catalyst with improved exhaust gas purification performance, and in order to achieve such an object, the present invention provides an exhaust gas purification catalyst (1A) including a substrate (10) and a catalyst layer (20) provided on the substrate (10), wherein the catalyst layer (20) includes a first layer (21) containing Rh, and Pd and/or Pt, and a second layer (22) containing Rh, and Pd and/or Pt, wherein a total content of Zr and Ce in terms of oxide and a content of aluminum element in terms of oxide in the first layer (21) are 70% by mass or more and 15% by mass or less, respectively, based on a mass of the first layer (21), and wherein a content of aluminum element in terms of oxide and a total content of Zr and Ce in terms of oxide in the second layer (22) are 75% by mass or more and 15% by mass or less, respectively, based on a mass of the second layer (22).

An object of the present invention is to provide an exhaust gas purification catalyst with improved exhaust gas purification performance, and in order to achieve such an object, the present invention provides an exhaust gas purification catalyst (1A) including a substrate (10) and a catalyst layer (20A) provided on the substrate (10), wherein a content of aluminum element in terms of oxide and a content of barium element in a first layer (21) of the catalyst layer (20A) are 15% by mass or more and 3% by mass or more, respectively, based on a mass of the first layer (21), and wherein a total of a content of zirconium element in terms of oxide and a content of a rare earth element in terms of oxide, a content of aluminum element in terms of oxide, and a content of barium element in a second layer (22) of the catalyst layer (20A) are 80% by mass or more, less than 15% by mass, and less than 3% by mass, respectively, based on a mass of the second layer (22).

An object of the present invention is to provide an exhaust gas purification catalyst composition and an exhaust gas purification catalyst, each of which utilizes a phosphorus capturing material that enables solving a problem of MAO, and in order to achieve the object, a complex oxide containing Mg, Ba, and Al, wherein the complex oxide has a spinel-type crystal structure, and wherein a molar ratio of a Mg content to an Al content in the complex oxide is 0.010 or more and 0.25 or less is used as a phosphorus capturing material.

The present invention is directed to a wall-flow filter which is used in particular in exhaust gas systems of vehicles driven by gasoline engines. The filter has three-way activity and filters fine particles, which result from the combustion of gasoline, from the exhaust gas stream. The invention also relates to a method for producing a corresponding filter and to the preferred use thereof.

The exhaust gas purification device includes a substrate, a first catalyst layer, and a second catalyst layer. The substrate includes an upstream end and a downstream end. The first catalyst layer contains first catalyst particles and lies on the substrate across a first region extending between the upstream end and a first position. The first position is at a first distance from the upstream end toward the downstream end. The second catalyst layer contains second catalyst particles and lies on the first catalyst layer across the first region. The second catalyst layer is provided with pores. Pore connectivity of the second catalyst layer is 5% to 35%. A mean value of areas of the pores of the second catalyst layer in a cross-sectional backscattered electron image of the second catalyst layer may be 0.7 ?m.sup.2 to 9.0 ?m.sup.2.

A gasoline particulate filter for an exhaust system of a gasoline internal combustion engine includes a substrate and a catalytic coating disposed on the substrate. The catalytic coating has a carrier and at least one catalytically active ingredient. The catalytic coating has a carrier loading less than or equal to 0.5 g/in.sup.3 (0.03 g/cm.sup.3), and a catalytically active ingredient loading greater than or equal to 0.01 g/ft.sup.3 (0.35 g/m.sup.3) and less than 2 g/ft.sup.3 (70.63 g/m.sup.3).

An exhaust purification system includes an LAF sensor provided in an exhaust pipe and generates a signal corresponding to an air-fuel ratio of exhaust gas. An upstream catalytic converter is downstream of the LAF sensor and has a catalyst to purify the exhaust gas. An O2 sensor is downstream of the upstream catalytic converter, and generates a signal corresponding to the air-fuel ratio of the exhaust gas. A GPF is downstream of a the O2 sensor and purifies the exhaust gas. An ECU controls an air-fuel mixture in an engine using output signal KACT of the LAF sensor and an output signal VO2 of the O2 sensor such that the air-fuel ratio of exhaust gas flowing into the GPF converges to a target value near the stoichiometric ratio. The GPF has a filter substrate and a downstream TWC supported by a partition of the filter substrate.

Catalyzed particulate filters comprise three-way conversion (TWC) catalytic material, which comprises rhodium as the only platinum group metal, that permeates walls of a particulate filter. Such catalyzed particulate filters may be located downstream of close-coupled three-way conversion (TWC) composites in an emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust stream comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates.