216results about "Surface coverings" patented technology

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 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.

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.

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.

A technology capable of achieving excellent NOx storage ability is provided. An exhaust gas-purifying catalyst 1 according to the present invention includes a substrate 10 and a catalyst layer 20 supported on the substrate 10, wherein the catalyst layer 20 contains a first supported catalyst 21 containing a first heat resistant carrier 210 and rhodium 211 supported on the first heat resistant carrier 210, a second supported catalyst 22 containing a second heat resistant carrier 220 and platinum 221 supported on the second heat resistant carrier 220, the second heat resistant carrier 220 containing an inorganic oxide which has a spinel structure and contains alumina and magnesia, a third supported catalyst 25 containing a third heat resistant carrier 250 and platinum 251a and a noble metal 251b other than platinum which are supported on the third heat resistant carrier, and a nitrogen oxide storage material 24 and 26, wherein a proportion of a mass of platinum contained in the second supported catalyst 22 in an entire mass of platinum contained in the catalyst layer is in a range of 15% by mass to 35% by mass.

A NOX storage catalyst includes CHA zeolite, a transition metal ion-exchanged in the CHA zeolite, and a rare earth metal that is different the transition metal and is supported on the CHA zeolite. A method for preparing a NOX storage catalyst includes preparing a synthetic mother liquid including a zeolite raw material as a source of silica and alumina, a structure-inducing material, a complexing material, and a solvent, reacting the synthetic mother liquid to prepare a CHA zeolite, and supporting a transition metal and a rare earth metal that is different from the transition metal on the prepared CHA zeolite.

An object of the present invention is to provide an exhaust gas purification catalyst including a catalyst layer containing Rh and a Ce-Zr-Al-based complex oxide, the exhaust gas purification catalyst being capable of achieving both improvement of the oxygen storage capacity of the Ce-Zr-Al-based complex oxide and prevention of the decrease in the exhaust gas purification performance of Rh, and the present invention provides an exhaust gas purification catalyst (1) including a substrate (10) and a first catalyst layer (20) provided on the substrate (10), wherein the first catalyst layer (20) contains Rh and a complex oxide containing Ce, Zr, and Al, wherein the content of the complex oxide is 70% by mass or more, based on a total mass of all components other than Rh in the first catalyst layer (20), and wherein a mass ratio of a content of Ce in terms of metal in the complex oxide to a content of Zr in terms of metal in the complex oxide is 0.03 or more and 0.50 or less.

A sensor element includes: an element body including an oxygen-ion-conductive solid electrolyte layer; and a protective layer that covers at least part of the element body and is a porous body having a plurality of pores thereinside. The standard deviation of the porosity of the protective layer is 2.3% or less.

The present invention relates to a particulate filter, which comprises a substrate comprising a plurality of porous walls extending longitudinally to form a plurality of parallel channels extending from an inlet end to an outlet end, wherein a quantity of the channels are inlet channels that are open at the inlet end and closed at the outlet end, and a quantity of channels are outlet channels that are closed at the inlet end and open at the outlet end; and a layer of inorganic particles loaded on surfaces of porous walls in the inlet channels and / or outlet channels, wherein the inorganic particles comprise or consist of boehmite particles. The present invention also relates to a method for producing a particulate filter which includes applying inorganic particles comprising or consisting of boehmite particles in inlet channels and / or outlet channels of a substrate.

A honeycomb filter includes: a honeycomb substrate having porous partition walls disposed so as to surround cells extending from an inflow end face to an outflow end face, an outer peripheral coating layer disposed so as to surround an outer periphery of the honeycomb substrate, and plugging portions that are disposed at any one of ends on the inflow end face and ends on the outflow end face, of the cells, wherein, the outer peripheral coating layer has an inflection point at which thermal expansion in thermal expansion behavior of the outer peripheral coating layer turns to contraction and a temperature T1 of which is 1000 to 1500° C., and the outer peripheral coating layer has a porosity P1 of 36 to 48%, and a thermal expansion coefficient C1 between 40 to 800° C. of 2.5 to 3.5×10−6 / ° C.

A catalyst for the treatment of an exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons, the catalyst comprising a first washcoat layer comprising Mn supported on a CuO—Al2O3 mixed oxide, and a substrate, wherein the substrate has an inlet end, and an outlet end, wherein the catalyst further comprises one or more platinum group metals comprising Pt, Pd, or Pt and Pd, wherein the one or more platinum group metals are at least in part contained in one or more of: (a) the first washcoat layer, and (b) an optional second washcoat layer, or (c) optional second and third washcoat layers. Further, the present invention relates to an exhaust gas treatment system comprising said catalyst, a method for the treatment of an exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons using said catalyst.

The present invention relates to a catalyst article for treating exhaust gas, the catalyst article comprising a substrate and at least a first catalytic region disposed on the substrate, wherein the first catalytic region comprises a ceria-zirconia support material and a non-ceria-zirconia support material; wherein from 0.1 to 3 wt. % Pt is supported on the ceria-zirconia support material, based on the total weight of the Pt supported on the ceria-zirconia support material and the ceria-zirconia support material; wherein less than 0.1 wt. % Pt is supported on the non-ceria-zirconia support material, based on the total weight of the Pt supported on the non-ceria-zirconia support material and the non-ceria-zirconia support material; and wherein the first catalytic region comprises from 0.1 to 50 g / ft3 Pt, based on the total volume of the substrate.

Embodiments of the disclosure provide an apparatus having a source gas conduit with a sorbent coating to adsorb compounds from a gas stream, and related methods. An apparatus of the disclosure includes a heat exchanger having an interior configured to transmit a heat exchange medium. A plurality of source gas conduits is in thermal communication with the heat exchanger and configured to transmit a gas stream therethrough. Each of the plurality of source gas conduits is in thermal communication with the heat exchanger. A sorbent coating is on an interior sidewall of each of the plurality of source gas conduits.

A method for the manufacture of a gasoline particulate filter (GPF) for the treatment of an exhaust gas is disclosed. The method comprises (i) forming a washcoat slurry; (ii) coating a wall-flow filter substrate with the washcoat slurry to form a washcoated substrate; and (iii) calcining the washcoated substrate to form a gasoline particulate filter. The washcoat slurry comprises (a) a platinum group metal selected from the group consisting of Pt, Pd, Rh and mixtures thereof; (b) an oxygen storage capacity (OSC) material; and (c) a C2-C6 aliphatic amino acid.

An exhaust gas purification catalyst particle is an exhaust gas purification catalyst particle comprising inorganic oxide particles and an inorganic coating layer coating the inorganic oxide particles, wherein the cumulative fine pore volume in the range of 0.1 to 20 μm in pore diameter is reduced as compared to the cumulative fine pore volume in the range of 0.1 to 20 μm in pore diameter of the inorganic oxide particles before being coated with the inorganic coating layer, and the thermal conductivity is higher than that of the inorganic oxide particles before being coated with the inorganic coating layer.

To provide an exhaust gas purification system for a gasoline engine that has high NH3 purification performance after endurance.SOLUTION: An exhaust gas purification system for a gasoline engine disclosed herein is disposed in an exhaust path of a gasoline engine. The exhaust gas purification system comprises an upstream catalytic converter including a first catalyst, and a downstream catalytic converter including a second catalyst. The first catalyst contains a catalytic precious metal. The second catalyst has a structure in which an NH3 adsorption layer and a catalyst layer are stacked on a base material. The NH3 adsorption layer of the second catalyst contains zeolite as the NH3 adsorption material. The catalyst layer of the second catalyst contains a catalytic precious metal and an OSC material.SELECTED DRAWING: Figure 1

An exhaust gas purifying system for a gasoline engine with high NH3 purifying performance after duration is provided. The exhaust gas purifying system for a gasoline engine disclosed herein is configured to be disposed in an exhaust path of the gasoline engine. The exhaust gas purifying system includes an upstream catalyst converter including a first catalyst body and a downstream catalyst converter including a second catalyst body. The first catalyst body contains a catalyst precious metal. The second catalyst body has a structure in which an NH3 adsorption layer and a catalyst layer are stacked on a base material. The NH3 adsorption layer of the second catalyst body contains a zeolite as an NH3 adsorber. The catalyst layer of the second catalyst body contains a catalyst precious metal and an OSC material.

Provided is a catalyst for exhaust gas purification that has improved NOx storage performance in a lean atmosphere. A catalyst 100 for exhaust gas purification disclosed herein includes a substrate 10 and a catalyst layer 20. The catalyst layer 20 includes a lower layer 22, a middle layer 24, and an upper layer 26. The upper layer 26 contains Rh. The middle layer 24 contains at least Pt and a NOx storage material. The lower layer 22 has a lower-layer front portion 22a containing Pd and a lower-layer rear portion 22b containing Pd. The Pd content (CF) in the lower-layer front portion 22a per L of the substrate is greater than the Pd content (CR) in the lower-layer rear portion 22b per L of the substrate.

An gas purification catalyst device having a catalyst coated layer formed on at least one base material, wherein: the catalyst coated layer includes a first catalyst coated layer on the upstream side of an exhaust gas flow, and a second catalyst coated layer on the downstream side of the exhaust gas flow; the first catalyst coated layer includes a hydrocarbon adsorbent and a catalytic precious metal; and the second catalyst coated layer includes a nitrogen oxide adsorbent and a catalytic precious metal.

The present disclosure provides a technology of reducing waviness of a carrying width of a catalyst metal carrying portion in an exhaust gas purification catalyst. A method disclosed herein includes: preparing a base material having an exhaust gas passage; preparing a catalyst metal solution containing a catalyst metal oxidizing or reducing exhaust gas component; supplying the catalyst metal solution to a chemical solution plate so that a bottom surface of the chemical solution plate is not exposed; immersing an end of the base material in the catalyst metal solution supplied to the chemical solution plate; and firing the base material. The bottom surface of the chemical solution plate is provided with grooves in a predetermined pattern, and an average of depths of the grooves is from 1.2 mm to 3 mm inclusive, and an average of widths of the grooves is from 1.6 mm to 3 mm inclusive.

The invention relates to a method for manufacturing a particulate filter for use in exhaust applications. In particular, the invention relates to a so-called wall-flow filter substrate coated with a dry ceramic powder in the inlet region. A corresponding filter or an exhaust system comprising said filter and its use in an exhaust purification method are also disclosed.

The present invention relates to a composition comprising platinum supported on titanium oxide, the platinum particles having an average particle diameter of 50-200 nm. The composition has a surprisingly low light-off temperature for the ammonia oxidation and a high selectivity for oxidation to N2.

Disclosed is a catalyst composition for exhaust gas purification, which is a catalyst composition for exhaust gas purification containing Ce-based oxide particles, Ce-Zr-based composite oxide particles, and a noble metal element, wherein the amount of Ce in the Ce-based oxide particles, based on the mass of the Ce-based oxide particles, is 80% by mass or greater in terms of the CeO2 equivalent, the amount of Ce in the Ce-Zr-based composite oxide particles, based on the mass of the Ce-Zr-based composite oxide particles, is 5% by mass or greater and 90% by mass or less in terms of the CeO2 equivalent, and the crystallite diameter of CeO2 in the Ce-based oxide particles is 10 nm or greater.

The present invention relates to catalyzed particulate filters, particularly for use in the emission treatment systems of internal combustion engines. Provided are catalyzed particulate filters, methods of making catalyzed particulate filters, and methods of using catalyzed particulate filters to control emissions in exhaust gases from internal combustion engines.

A method for the manufacture of a catalytic gasoline particulate filter (GPF) for the treatment of exhaust gas from a gasoline engine is disclosed. The method comprises: coating a wall-flow filter substrate with a first washcoat slurry from a second face of the substrate to form a first coating disposed within the porous walls and extending from the second face for at least 50% of a length of a second plurality of channels; coating the wall-flow filter substrate with a second washcoat slurry from a first face to form a second coating disposed on the first plurality of inner surfaces and extending from the first face for at least 70% of a length of the first plurality of channels; and calcining the first coating and the second coating to form the catalytic GPF.

The present invention relates to a particulate filter, the particulate filter being a substrate comprising a plurality of porous walls extending longitudinally so as to form a plurality of parallel flow paths extending from an inlet end to an outlet end, wherein a certain amount of the flow paths are inlet flow paths that are open at the inlet end and closed at the outlet end, and a certain amount of the flow paths are outlet flow paths that are closed at the inlet end and open at the outlet end, a substrate, and a layer of inorganic particles loaded on the surface of the porous walls in the inlet flow path and / or the outlet flow path, the layer of inorganic particles containing inorganic particles having a small BET pore volume of 0.5 cm 3 / g or less. The present invention also relates to a method for manufacturing a particulate filter, which includes applying inorganic particles or a precursor thereof to the surface of the porous walls in the inlet flow path and / or the outlet flow path to deposit a layer of inorganic particles containing inorganic particles having a small BET pore volume.

A pillar-shaped honeycomb structure including an outer peripheral side wall, and a plurality of partition walls disposed on an inner peripheral side of the outer peripheral side wall, the plurality of partition walls partitioning a plurality of cells forming flow paths from a first end surface to a second end surface, whereinan average pore diameter of the partition walls measured by a mercury porosimeter is 10 μm or less, andwhen a cross section of the plurality of partition walls is observed with an X-ray microscope and porosities (%) of each partition wall is measured in a thickness direction from one surface to the other surface of each partition wall, an average porosity of each partition wall is 40 to 70%, and a difference between a maximum value and a minimum value of the porosity of each partition wall is 11% or less.

The present invention relates to a rhodium-free TWC catalyst article comprising a catalyst composition coating on a substrate, the catalyst composition coating comprising: a first region comprising: i) a top layer comprising a first platinum composition and a first palladium composition, each present in supported form; ii) a bottom layer comprising a second platinum composition in supported form; and optionally a second region downstream of the first region comprising: iii) a top layer comprising a third platinum composition in supported form; and iv) a bottom layer comprising a fourth platinum composition in supported form. The present invention relates to an exhaust treatment system comprising the rhodium-free TWC catalyst article.

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 and germanium, and has a content of heteroatom T-atoms of ≤about 0.20 mol %, wherein the germanium is present in an amount of from 15 to 20 mol %. The present invention further relates to a catalyst article and a compressed natural gas combustion and exhaust system.

A method for manufacturing a diesel oxidation catalyst comprises: (i) providing a carrier substrate; (ii) forming on the carrier substrate one or more platinum group metal-containing washcoat layers each containing a refractory metal oxide carrier material to provide a first coated substrate; (iii) subjecting the first coated substrate to a first heat treatment comprising heating the first coated substrate to a first maximum temperature and holding the first coated substrate at the first maximum temperature to form a heat-treated coated substrate; (iv) depositing a platinum group metal-containing composition containing a refractory metal oxide carrier material on at least a portion of the heat-treated coated substrate to form a second coated substrate; and (v) subjecting the second coated substrate to a second heat treatment comprising heating the second coated substrate to a second maximum temperature and holding the second coated substrate at the second maximum temperature to form a diesel oxidation catalyst, wherein the first maximum temperature is at least 600 °C and the second maximum temperature is at least 25 °C lower than the first maximum temperature.