822results about "Surface coverings" patented technology

The present invention relates to a wall-flow filter for removing particles from the exhaust gas of an internal combustion engine, which comprises a coating F, which comprises a sintered material S, wherein material S comprises an oxide, oxide-hydroxide, carbonate, sulphate, silicate, phosphate, mixed oxide, composite oxide, molecular sieve or a mixture comprising two or more of these materials.

An exhaust gas purification catalyst comprising: an upstream catalyst provided on the upstream side in the flow direction of exhaust gas; and a downstream catalyst provided on the downstream side in the flow direction of exhaust gas, wherein the upstream catalyst has a base A and a layer a1 provided on the base A, the downstream catalyst has a base B and a layer b1 provided on the base B, the layer a1 contains Rh and a Ce-Zr-Al complex oxide, the layer b1 contains Rh and a Ce-Zr complex oxide, the contained amount of Al calculated as Al2O3 in the Ce-Zr-Al complex oxide contained in the layer a1 is at least 30 mass% with respect to the mass of the Ce-Zr-Al complex oxide, the contained amount of the Ce-Zr-Al complex oxide contained in the layer a1 is at least 50 mass% with respect to the mass of the layer a1, and the layer b1 does not contain Al or, if the layer b1 contains Al, the contained amount of Al calculated as Al2O3 in the layer b1 is at most 30 mass% with respect to the mass of the layer b1.

Methods for treating a filter for filtering particulate matter from exhaust gas are disclosed in which a dry powder is sprayed towards an inlet face of the filter entrained in a primary flow of gas to pass through the inlet face to contact a porous structure of the filter. The back pressure of the filter is monitored during spraying of the dry powder and the spraying of the dry powder is stopped when the back pressure of the filter reaches a required value. The required value may equal an absolute back pressure, or a pre-determined target back pressure for the filter minus an offset pressure, or an estimated back pressure of the filter.

An exhaust treatment method and apparatus for treating an exhaust stream flowing through an exhaust line housing in a downstream direction, the apparatus comprising a first particulate filter, an SCR unit, and a second particulate filter downstream of the SCR unit, all serially positioned in the exhaust line.

The present invention provides a catalytic article comprising a) a first layer comprising a nickel component and a copper component supported on a ceria component, wherein the amount of the nickel component is 0.1 to 30 wt. %, calculated as nickel oxide, based on the total weight of the first layer, and wherein the amount of the copper component is 0.01 to 5.0 wt. % calculated as copper oxide, based on the total weight of the first layer; b) a second layer comprising a platinum group metal component supported on at least one of an oxygen storage component, an alumina component and a zirconia component, wherein the platinum group metal component comprises platinum, rhodium, palladium, or any combination thereof, and wherein the amount of the platinum group metal component is 0.01 to 5.0 wt. % based on the total weight of the second layer; and c) a substrate, wherein the first layer and the second layer are separated by a barrier layer or a gap.

A method of controlling an exhaust gas aftertreatment system includes receiving a plurality of emissions values from a plurality of sensors disposed in an aftertreatment system, determining a real-time conversion efficiency for one or more legs of the aftertreatment system based on the emissions values, determining a real-time conversion metric for the aftertreatment system based on the real-time conversion efficiency for the one or more legs, comparing the real-time conversion metric to an upper threshold value, and initiating a cleaning operation to clean the aftertreatment system based on a determination that the real-time conversion metric satisfies the upper threshold value.

The present invention provides an exhaust gas purification catalyst in which platinum group metal migration from a catalyst layer to a base material during high temperature duration is suppressed. The exhaust gas purification catalyst disclosed herein includes a base material, a catalyst layer, and an intermediate layer arranged between the base material and the catalyst layer. The base material contains SiC. The catalyst layer contains a platinum group metal as a catalyst component. The intermediate layer contains substantially no platinum group metal. A product of a thickness of the intermediate layer (μm) and a specific surface area (m2 / g) of the intermediate layer is 1100 or more.

The present invention relates to a method for producing a coated wall-flow filter. The wall-flow filter is coated with a powder aerosol.

An exhaust aftertreatment system (10) in the exhaust stream of an internal combustion engine (12) that is at least partially powered by an alcohol fuel is permeable to an exhaust stream containing nitrogen oxides as well as an alcohol and / or formaldehyde. The exhaust aftertreatment system (10) comprises a metering device (14) for metering ammonia into the exhaust stream, a first SCR catalyst (16), and a second SCR catalyst (18), wherein the first SCR catalyst (16) is arranged in the exhaust stream downstream of the metering device (14) and is configured to generate a treated exhaust stream from the exhaust stream of the internal combustion engine (12) that contains nitrogen oxides and at least one nitrogen-containing hydrocarbon compound.The second SCR catalyst (18) is arranged in the exhaust stream downstream of the first SCR catalyst (16) and is designed to reduce the nitrogen oxides contained in the generated treated exhaust stream by consuming the nitrogen-containing hydrocarbon compound contained in the generated treated exhaust stream. Furthermore, a method for exhaust aftertreatment and the use of an exhaust aftertreatment system (10) are specified.

An exhaust aftertreatment system (10) in the exhaust stream of an internal combustion engine (12) that is at least partially powered by an alcohol fuel is permeable to an exhaust stream from the internal combustion engine (12) containing nitrogen oxides as well as an alcohol and / or formaldehyde. The exhaust aftertreatment system (10) comprises an oxidation catalyst (14) for removing methanol and formaldehyde from the exhaust stream, an SCR catalyst (18), and a metering device (16) for metering ammonia into the exhaust stream, wherein the oxidation catalyst (14) is arranged in the exhaust stream upstream of the SCR catalyst (18). The metering device (16) is arranged in the exhaust stream upstream of the SCR catalyst (18) and upstream or downstream of the oxidation catalyst (14). Furthermore, a method for exhaust aftertreatment and the use of the exhaust aftertreatment system (10) are specified.

To provide an exhaust gas purification device reduced in pressure loss and improved in exhaust gas purification performance.SOLUTION: An exhaust gas purification device is provided with a honeycomb substrate and an outflow cell-side catalyst. The honeycomb substrate has a porous partition wall defining a plurality of cells extending to an outflow-side end face from an inflow-side end face. The plurality of cells include an inflow cell and an outflow cell adjacent to each other while sandwiching the partition wall.The inflow cell is opened at the inflow-side end and blocked at the outflow-side end. The outflow cell is blocked at the inflow-side end and opened at the outflow-side end. The outflow cell-side catalyst is provided in a partition wall inside area on the outflow cell side in the outflow cell-side catalyst disposition range extending to a position separated by a prescribed distance from the outflow-side end of the partition wall along an extending direction. A minimum value of a void ratio in the outflow cell-side catalyst disposition range of the partition wall and in a width direction of the outflow cell-side catalyst disposition wall including the outflow cell-side catalyst is set within a range of 20-30%.SELECTED DRAWING: Figure 2

A method of making a ceramic honeycomb wall-flow filter substrate supporting an on-wall coating, a fragment of which on-wall coated filter substrate analysed by mercury porosimetry has a volume of pores of 005 to 0.5 µm diameter as a percentage of a mercury intrusion volume of the fragment of at least 15.0%, comprises the steps of: (i) preparing a slurry comprising water, a carboxylic acid, inorganic oxide particles or a mixture of two or more inorganic oxide particles having a D(v, 0.9) of 8 to 20 µm; and 10 to 35 % by weight relative to 100% weight of the inorganic oxide particles of a particulate insoluble cellulose pore former of non-uniform morphology and having an equivalent spherical diameter D(v, 0.5) of 0.5 to 14 µm and a modal aspect ratio (width / length) of 0.3 to 0.9; (ii) coating the slurry on at least first channels of the substrate, wherein the substrate has a mean pore size (D50) of 6 to 15 µm prior to any coating and a porosity less than 60% prior to any coating; and (iii) drying and calcining the slurry-coated substrate, whereby sufficient slurry is coated on the substrate so that the product of step (iii) has a coating loading of 0.07 to 0.4 g / in3 (4.3 to 24.4 g / L), relative to a substrate weight prior to step (ii) and wherein a mean average on- wall coating thickness of the coated substrate is 5 to 70 µm.

The present invention discloses catalytic devices for the selective catalytic reduction of nitrogen oxides from the exhaust gas of combustion engines, comprising a carrier substrate of length L, a bottom layer comprising a zone D extending from a second side over a length LZ and comprising a first SCR composition consisting of one or more manganese-containing mixed oxides, or a mixture of one or more manganese-containing mixed oxides and one or more metal-promoted small-pore zeolites; and a zone C' extending from a first side over a length LY = L - LZ and comprising a third SCR composition consisting of a V / TiO2 SCR catalyst composition which comprises at least one oxide of vanadium, and a top layer comprising a material zone C extending over the carrier substrate and comprising a second SCR composition consisting of a V / TiO2 SCR catalyst composition which comprises at least one oxide of vanadium.

A pillar shaped honeycomb structure, including: an outer peripheral wall; and a porous partition wall disposed inside the outer peripheral wall, the a porous partition wall defining a plurality of cells, each of the cells extending from one end face to other end face to form a flow path, wherein a surface of the porous partition wall in the cells comprise a collecting layer having an average pore diameter lower than that of the porous partition wall; and wherein magnetic particles having a Curie point of 700° C. or higher are provided either or both between the surfaces of the porous partition wall and the collecting layer, and on the collecting layer.

An exhaust gas purification catalyst disclosed herein comprises a catalyst layer 20 including a lower catalyst layer 22 and an upper catalyst layer 24. A lower-layer front portion A containing Pd is provided on the upstream side of the lower catalyst layer 22, and a lower-layer rear portion B containing at least one of Pd and Pt is provided on the downstream side of the lower catalyst layer 22. Further, an upper-layer front portion C containing Rh is provided on the upstream side of the upper catalyst layer 24, and an upper-layer rear portion D containing Rh is provided on the downstream side of the upper catalyst layer 24. The lower-layer front portion A, the lower-layer rear portion B, the upper-layer front portion C, and the upper-layer rear portion D each have an individually set CeO2 content. In addition, in this exhaust gas purification catalyst, the ratio APGM / BPGM of the amount of the catalytic metal present in the lower-layer front portion A to the amount of the catalytic metal present in the lower-layer rear portion B is set to 0.8 or more and 1.1 or less from the viewpoint of achieving both OSC performance and warm-up performance. As a result, it is possible to provide an exhaust gas purification catalyst that can exhibit adequate purification performance according to the operation state of an internal combustion engine.

An exhaust gas purification catalyst (10) contains a refractory three-dimensional structure (20), a second catalyst layer (31) containing palladium and rhodium, and a first catalyst layer (32) containing palladium positioned between the refractory three-dimensional structure (20) and the second catalyst layer (31), in which the first catalyst layer (32) or the second catalyst layer (31) further contains a Zr—Pr composite oxide that is a composite oxide of zirconium and praseodymium. A proportion of a mass of praseodymium oxide contained in the Zr—Pr composite oxide relative to a total mass of zirconium oxide and praseodymium oxide contained in the Zr—Pr composite oxide may be 11% or more and 90% or less.

The invention provides a catalyst composition, including a mixture of catalytically active particles and a magnetic material, such as superparamagnetic iron oxide nanoparticles, capable of inductive heating in response to an applied alternating electromagnetic field. The catalytically active particles will typically include a base metal, platinum group metal, oxide of base metal or platinum group metal, or combination thereof, and will be adapted for use in various catalytic systems, such as diesel oxidation catalysts, catalyzed soot filters, lean NOx traps, selective catalytic reduction catalysts, ammonia oxidation catalysts, or three-way catalysts. The invention also includes a system and method for heating a catalyst material, which includes a catalyst article that includes the catalyst composition and a conductor for receiving current and generating an alternating electromagnetic field in response thereto, the conductor positioned such that the generated alternating electromagnetic field is applied to at least a portion of the magnetic material.

An apparatus comprises an internal combustion engine configured to run on a mixture of air and fuel, wherein the fuel of the mixture of air and fuel is a gaseous fuel comprising at least 95 vol% H2, a source of gaseous fuel comprising at least 95 vol% H2 and an exhaust system comprising a catalytic aftertreatment component, wherein the catalytic aftertreatment component comprises a catalyst composition comprising palladium and gold on a metal oxide support.

A system includes a controller for an exhaust aftertreatment system including a SCR catalyst in exhaust gas-receiving communication with an engine and at least one reductant dosing system structured to provide reductant to the exhaust gas. The controller is structured to determine a ratio of NO to NO2 at or proximate an inlet of the SCR catalyst. The controller is further structured to command the at least one reductant dosing system to increase, decrease, or maintain an amount of reductant provided to the exhaust gas based on comparing the ratio of NO to NO2 to a previous NO to NO2 ratio.

The present invention relates a system for the treatment of an exhaust gas of a diesel combustion engine, said system comprising a specific NOx adsorber component, a diesel oxidation catalyst (DOC) component, a selective catalytic reduction (SCR) component, a gas heating component, and a reductant injector, wherein in said system, the specific NOx adsorber component is arranged upstream of the gas heating component, the reductant injector is arranged up-stream of the SCR component, the gas heating component is arranged upstream of the reductant injector, the DOC component is arranged upstream of the reductant injector, and the DOC component and the gas heating component are directly consecutive components. Further, the present invention relates a process for preparing such a system and use thereof.

A catalyst article for treating exhaust gas, comprising a substrate having an axial length L and including an inlet end and an outlet end, a first catalyst region starting at the inlet end and extending over a length less than the axial length L, the first catalyst region comprising a first platinum group metal (PGM) component, a first inorganic oxide, and an optional first oxygen storage capacity (OSC) material, a second catalyst region starting at the outlet end and extending over a length less than the axial length L, the second catalyst region comprising a second PGM component, an optional second inorganic oxide, and a second OSC material, and a third catalyst region, wherein the weight ratio of the optional first OSC material to the first inorganic oxide is greater than 1:1.

The method includes: preparing a base material having a wall flow structure, including a first cell with an opening only at an first end, a second cell with an opening only at a second end, and a porous partition partitioning the first cell and the second cell; supplying a catalyst layer forming material to the first end and applying the catalyst layer forming material to an inside of the partition from the first end up to a predetermined length along the extension direction of the partition such that an uncoated portion where the second end is not coated with the catalyst layer forming material in a range facing the first cell of the partition in the extension direction of the partition is formed, and ventilating from the second end and drying the applied catalyst layer forming material.

A particle filter includes a particle filter housing and a filter body arrangement which is accommodated in the particle filter housing and is configured to separate particles out of an exhaust-gas flow that is emitted by an internal combustion engine and passes through the filter body arrangement when the latter is used as intended. The filter body arrangement has filter body elements that are separated from one another by at least one liquid-tight layer that is oriented at least substantially in the direction of longitudinal extension of the particle filter. Further aspects relate to an exhaust-gas aftertreatment device for an internal combustion engine, and to a motor vehicle.

An exhaust gas purifying catalyst with a high NOx storing characteristic includes a base material and a catalyst layer. The catalyst layer has a first layer including an upstream side catalyst layer formed from an exhaust gas inflow side end part of the exhaust gas purifying catalyst toward an exhaust gas outflow side direction, and a downstream side catalyst layer formed from an exhaust gas outflow side end part of the exhaust gas purifying catalyst toward an exhaust gas inflow side direction. The upstream and downstream side catalyst layers contain at least Pd and / or Rh as a catalyst metal and OSC containing Ce. A second layer contains Pt as the catalyst metal and a NOx storing material. When the CeO2 quantity in the upstream side catalyst layer is C1 and the CeO2 quantity in the downstream side catalyst layer is C2 in the first layer, a relation of C1<C2 is satisfied.

The present disclosure provides an exhaust gas purification catalyst improved in structural stability. The present disclosure relates to an exhaust gas purification catalyst including a substrate and a catalyst layer disposed on the substrate. The catalyst layer has a two-layer structure including a first coat layer formed on the substrate and a second coat layer formed on the first coat layer. The first coat layer contains alumina and an OSC material. The alumina has an average particle diameter of 6.0 μm or more, and the OSC material has an average particle diameter of 6.0 μm or more. The OSC material is a ceria-zirconia-based composite oxide without alumina.

The present disclosure relates to zeolite catalysts having an aging durability and improved catalytic activity. For example, the zeolite catalysts comprise a specific aluminum distribution, e.g., the positioning of two framework aluminum atoms in the zeolite structure at third-nearest-neighbor (3NN) relative positions in the framework. The zeolite catalysts have two tetrahedrally coordinated AI sites that are separated by two tetrahedrally coordinated Si sites. The disclosure is also directed to process and methods for their characterization and usage.

An oxidation catalyst article comprises a flow-through honeycomb substrate having an inlet end and an outlet end and a longitudinal length extending therebetween and comprising an array of channels each defined by a channel wall, a first washcoat extending from the inlet end up to 40% of the longitudinal length of the substrate and comprising a first platinum group metal composition on a first alumina support, the first washcoat having a total combined loading of Pt and Pd of X g / L (gft-3), a second washcoat extending from the inlet end up to 85% of the longitudinal length of the substrate and entirely overlapping the first washcoat, the second washcoat comprising a second platinum group metal composition on a second alumina support, the second washcoat having a total combined loading of Pt and Pd of Y g / L (gft-3); and a third washcoat extending from the outlet end comprising a third platinum group metal composition wherein the third platinum group metal composition is platinum only or both platinum and palladium on a third alumina support, the third washcoat having a total platinum group metal loading of Z g / L (gft-3); wherein 2Z<X>1.5Y, and wherein the third washcoat does not overlap the first washcoat.

Exhaust gas purification device (100), comprising: a substrate (10) comprising an upstream end (I) through which an exhaust gas is introduced into the device and a downstream end (J) through which the exhaust gas is discharged from the device, wherein the substrate (10) has a length Ls between the upstream end (I) and the downstream end (J); a first catalyst layer (20) containing palladium particles, which extends over a first region (X) and is in contact with the substrate (10), wherein the first region (X) extends between the upstream end (I) and a first position (P), wherein the first position (P) is located at a first distance La from the upstream end (I) in the direction of the downstream end (J); a second catalyst layer (30) containing rhodium particles, which extends over a second region (Y) and is in contact with the substrate (10), wherein the second region (Y) extends between the downstream end (J) and a second position (Q), the second position (Q) being located at a second distance Lb from the downstream end (J) in the direction of the upstream end (I); and a third catalyst layer (40) containing rhodium particles, which extends over a third region (Z) and is in contact with at least the first catalyst layer (20), wherein the third region (Z) extends between the upstream end (I) and a third position (R), wherein the third position (R) is located at a third distance Lc from the upstream end (I) in the direction of the downstream end (J), wherein a mean particle size distribution of the rhodium particles contained in the second catalyst layer (30) and the third catalyst layer (40) is from 1.0 nm to 2.0 nm, and a standard deviation of the particle size distribution of the rhodium particles contained in the second catalyst layer (30) and the third catalyst layer (40) is 0.8 nm or less.

[Problem] To achieve both improvement of emission control performance of a catalytic converter and suppression of catalyst degradation. [Solution] A honeycomb type metal substrate is provided, which is formed by alternately stacking metal flat foil and metal corrugated foil, wherein a plurality of holes are formed in the metal flat foil and the metal corrugated foil, and a burr having a small height is formed on the edge of each hole, wherein at least the surface of the burr is covered with an oxide coating containing α-alumina in the metal flat foil and the metal corrugated foil, and when the average pore size of the plurality of holes is defined as D, the pore size ratio of the holes is defined as R, and the average height of the burr is defined as L, the following equations (1) to (3) are satisfied, 0.2 mm ≤ D ≤ 4.0 mm (1); 5% ≤ R ≤ 70% (2); 0.1 μm ≤ L ≤ 30 μm (3).

Provided are particles for an exhaust gas purification catalyst, the particles comprising: inorganic oxide particles; and an inorganic coating layer covering the inorganic oxide particles. The particles for an exhaust gas purification catalyst have reduced cumulative pore volume in a pore diameter range of 0.1-20 µm compared to a cumulative pore volume in a pore diameter range of 0.1-20 µm of inorganic oxide particles before being coated with the inorganic coating layer. Accordingly, the particles for an exhaust gas purification catalyst have a higher thermal conductivity than the inorganic oxide particles before being coated with the inorganic coating layer.