Disclosed herein are oxidation catalyst compositions comprising a first platinum group metal (PGM) component, a manganese (Mn) component, a first refractory metal oxide support material, and a metal component comprising yttrium, lanthanum, tin, magnesium, cerium, titanium, or a combination of any of the foregoing, wherein each of the first PGM component, the Mn component, and the metal component are supported on the first refractory metal oxide support material; catalyst articles coated with at least one such catalyst composition; and emission treatment systems including at least one such catalyst article.

A system (2) comprising (i) a vehicular compression ignition engine (1) comprising one or more engine cylinders and one or more electronically-controlled fuel injectors therefor; (ii) an exhaust line (3) for the engine comprising: a first emissions control device (5) comprising a first honeycomb substrate, which comprises a hydrocarbon adsorbent component; and a second emissions control device (7) comprising an electrically heatable element (7a) and a catalysed second honeycomb substrate (7b), which comprises a rhodium-free platinum group metal (PGM) comprising platinum, wherein the electrically heatable element (7a) is disposed upstream from the catalysed second honeycomb substrate (7b) and wherein both the electrically heatable element (7a) and the catalysed second honeycomb substrate (7b) are disposed downstream from the first honeycomb substrate; a third emissions control device (22), which is a third honeycomb substrate comprising an ammonia-selective catalytic reduction catalyst disposed downstream from the second emissions control device (7); and one or more temperature sensors located: upstream of the electrically heatable element and/or upstream of the first honeycomb substrate; and between the electrically heatable element (7a) and the catalysed second honeycomb substrate (7b); and (iii) an engine control unit (20) comprising a central processing unit pre-programmed, when in use, to control both a heating activation state of the electrically heatable element (7a); an injection timing strategy of the one or more electronically-controlled fuel injector to increase the temperature of at least the first emissions control device following key-on/cold-starting a vehicle comprising the system, wherein the one or more temperature sensors are electrically connected to the engine control unit for feedback control in the system.

A system (2) comprising (i) a vehicular compression ignition engine (1) comprising one or more engine cylinders and one or more electronically-controlled fuel injectors therefor; (ii) an exhaust line (3) for the engine comprising: a first emissions control device (5) comprising a first honeycomb substrate, which comprises a hydrocarbon adsorbent component; and a second emissions control device (7) comprising an electrically heatable element (7a) and a catalysed second honeycomb substrate (7b), which comprises a rhodium-free platinum group metal (PGM) comprising platinum, wherein the electrically heatable element (7a) is disposed upstream from the catalysed second honeycomb substrate (7b) and wherein both the electrically heatable element (7a) and the catalysed second honeycomb substrate (7b) are disposed downstream from the first honeycomb substrate; a third emissions control device (22), which is a third honeycomb substrate comprising an ammonia-selective catalytic reduction catalyst disposed downstream from the second emissions control device (7); and one or more temperature sensors located: upstream of the electrically heatable element and/or upstream of the first honeycomb substrate; and between the electrically heatable element (7a) and the catalysed second honeycomb substrate (7b); and (iii) an engine control unit (20) comprising a central processing unit pre-programmed, when in use, to control both a heating activation state of the electrically heatable element (7a); an injection timing strategy of the one or more electronically-controlled fuel injector to increase the temperature of at least the first emissions control device following key-on/cold-starting a vehicle comprising the system, wherein the one or more temperature sensors are electrically connected to the engine control unit for feedback control in the system.

The present invention relates to a catalyst comprising a carrier substrate of the length L extending between substrate ends a and b and two washcoat zones A and B, wherein washcoat zone A comprises a zeolite having a smallest lower channel width of at least 0.4 nm and extends starting from substrate end a over a part of the length L, and washcoat zone B comprises the same components as washcoat A and palladium and extends from substrate end b over a part of the length L, wherein L=L.sub.A+L.sub.B, wherein L.sub.A is the length of washcoat zone A and L.sub.B is the length of substrate length B.

An exhaust-gas purification system of an internal combustion engine includes an electrically heated catalytic device and a three-way catalytic device. The electrically heated catalytic device includes a first honeycomb base having a large number of honeycomb passages and a first catalyst component that is supported on, by a predetermined thin-film treatment, surfaces that define the honeycomb passages and that contains one or more types of noble metals. The three-way catalytic device includes a second honeycomb base having a large number of honeycomb passages and a second catalyst component that is supported on surfaces defining the honeycomb passages and that contains one or more types of noble metals. The total noble metal content per unit volume of the second honeycomb base is higher than the total noble metal content per unit volume of the first honeycomb base.

An internal combustion engine includes an engine body, an HC adsorption and removal catalyst in an exhaust, including an HC adsorption layer and a catalyst layer, and having a desorption temperature of the HC from the HC adsorption layer lower than an HC removal temperature of a temperature where a rate of removal of HC at the catalyst layer is a predetermined rate or more when an air-fuel ratio of the exhaust is near the stoichiometric air-fuel ratio, and an air feed device for feeding air to the HC adsorption and removal catalyst. A control device for an internal combustion engine includes an air feed control for controlling feed air to the HC adsorption and removal catalyst when a condition stands. The condition includes the temperature of the HC adsorption and removal catalyst being the desorption temperature or more and less than the HC removal temperature.

A nitrogen oxides (NO.sub.x) and hydrocarbon (HC) storage catalyst for treating an exhaust gas flow is provided. The NO.sub.x and HC storage catalyst includes (a) a zeolite, (b) noble metal atoms, and (c) a metal oxide, a non-metal oxide, or a combination thereof. One or more of the noble metal atoms is present in a complex with the metal oxide, the non-metal oxide or a combination thereof. The complex is dispersed within a cage of the zeolite. Methods of preparing the NO.sub.x and HC storage catalyst and methods of using the NO.sub.x and HC storage catalyst for treating an exhaust gas stream flowing from a vehicle internal combustion engine during a period following a cold-start of the engine are also provided.

A hydrocarbon and NOx catalyst trap includes a three-way catalyst, and a zeolite layer adjacent to the three-way catalyst and including alumina and silica arranged to form a repeating skeletal frame that defines cavities including active metal active sites for hydrocarbon and NOx trapping such that individual atoms of the active metal are bound to the frame within the cavities via oxygen atoms.

To provide a hydrocarbon adsorbent having high hydrocarbon adsorbing properties even after exposed to a high temperature/high humidity reducing atmosphere.

A hydrocarbon adsorbent, which includes a FAU type zeolite having a lattice constant of at least 24.29 and containing copper. Such a hydrocarbon adsorbent may be used for a method for adsorbing hydrocarbons to be exposed to a high temperature/high humidity environment, and may be used particularly for a method for adsorbing hydrocarbons in an exhaust gas of an internal combustion engine, such as an automobile exhaust gas.

The present invention relates to a hydrocarbon adsorbent with metal-impregnated zeolite particles having regular mesopores and a manufacturing method therefor. The hydrocarbon adsorbent includes a metal cation and a metal oxide that are impregnated in zeolite particles, in particular, the zeolite particles include regularly formed mesopores having a size of 2 to 10. By adjusting a Si/Al ratio and mesoporosity of the mesopores, a hydrocarbon adsorbent may have increased adsorption capacity for hydrocarbons in a cold-start section and can rapidly oxidize the hydrocarbon upon desorption thereof, thereby reducing the discharge of exhaust gas produced in automobiles and industries.