Patent application number | Description | Published |
20080253950 | HYDROTHERMALLY STABLE AG-ZEOLITE TRAPS FOR SMALL OLEFIN HYDROCARBON MOLECULES - A hydrocarbon trap comprises an Ag-zeolite which is heated by a unique steaming regimen. | 10-16-2008 |
20090041643 | Multilayered Catalyst Compositions - A layered three-way conversion catalyst having the capability of simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides is disclosed. Engine exhaust treatment system and methods of using the same are also provided. In one or more embodiments, the catalyst supported on a carrier has three layers, where at least two of the layers are zoned to have an oxygen storage component being present in an upstream zone in an amount that is less than the oxygen storage component present in the downstream zone. | 02-12-2009 |
20090155151 | Methods and Systems Including CO Oxidation Catalyst With Low NO to NO2 Conversion - Catalysts, catalyst systems, and methods for removing ammonia and/or carbon monoxide in flue gases are provided where ammonia is used with a selective catalytic reduction catalyst for reducing oxides of nitrogen. An oxidation catalyst is utilized, which comprises particulate platinum or platinum/palladium dispersed on zirconia particles, the particulate platinum or platinum/palladium having an average particle size less than about 10 nm. The catalyst is effective to convert less than 20% of NO to NO | 06-18-2009 |
20100104491 | Multilayered Catalyst Compositions - A layered three-way conversion catalyst having the capability of simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides is disclosed. Engine exhaust treatment system and methods of using the same are also provided. The catalytic material can be provided in layers such that a larger amount of oxygen storage component is provided in a downstream zone as compared to an upstream zone. For example, the upstream zone can be configured to have one, two, or three layers, and the downstream zone can be independently configured to have one, two, or three layers. In one or more embodiments, the catalyst supported on a carrier has three layers, where at least two of the layers are zoned to have an oxygen storage component being present in an upstream zone in an amount that is less than the oxygen storage component present in the downstream zone. | 04-29-2010 |
20100180581 | DIESEL OXIDATION CATALYST COMPOSITE WITH LAYER STRUCTURE FOR CARBON MONOXIDE AND HYDROCARBON CONVERSION - Provided is a catalyst composition, in particular a diesel oxidation catalyst, for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC), and carbon monoxide (CO). More particularly, the present invention is directed to a catalyst structure comprising at least two, specifically three distinct layers, at least one of which contains an oxygen storage component (OSC) that is present in a layer separate from the majority of the platinum group metal (PGM) components, such as palladium and platinum. | 07-22-2010 |
20100186375 | Layered Diesel Oxidation Catalyst Composites - Provided are diesel exhaust components where palladium is segregated from a molecular sieve, specifically a zeolite, in a catalytic material. In the catalytic material, therefore, there are at least two layers: a palladium-containing layer that is substantially free of a molecular sieve and a hydrocarbon trap layer that comprises at least one molecular sieve and is substantially free of palladium. The palladium is provided on a high surface area, porous refractory metal oxide support. The catalytic material can further comprise a platinum component, where a minor amount of the platinum component is in the hydrocarbon trap layer, and a majority amount of the platinum component is in the palladium-containing layer. Systems and methods of using the same are also provided. | 07-29-2010 |
20110033353 | Preparation of Diesel Oxidation Catalyst Via Deposition of Colloidal Nanoparticles - The present invention relates to a process for preparing a catalyst, at least comprising the steps of adding a protecting agent to an aqueous solution of a metal precursor to give a mixture (M1), adding a reducing agent to mixture (M1) to give a mixture (M2), adding a support material to mixture (M2) to give a mixture (M3), adjusting the pH of mixture (M3), and separating the solid and liquid phase of mixture (M3). Furthermore, the present invention relates to the catalyst as such and its use as diesel oxidation catalyst. | 02-10-2011 |
20120077669 | Polymer-Assisted Synthesis Of A Supported Metal Catalyst - Described is a process for the preparation of a catalyst comprising the steps of:
| 03-29-2012 |
20120079817 | Surface-Coated Zeolite Materials For Diesel Oxidation Applications - A diesel oxidation catalyst for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC) and carbon monoxide (CO) is described. Also described is a novel washcoat composition including a surface-coated zeolite coated with at least one of zirconia and alumina, and a platinum group metal supported on a high surface area alumina. | 04-05-2012 |
20120124975 | Diesel Oxidation Catalyst Articles And Methods Of Making And Using - Diesel oxidation catalysts, catalytic articles, methods of making catalytic articles, emissions treatment systems and methods of treating an exhaust gas stream using the catalytic articles for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC) and carbon monoxide | 05-24-2012 |
20130084222 | Diesel Oxidation Catalyst with Layered Structure Containing Ceria Composition as Palladium Support Material for Enhanced HC and CO Gas Conversion - The present invention relates to a layered diesel oxidation catalyst (DOC) comprising: a) a carrier substrate; b) a diesel oxidation catalytic material comprising b1) a first layer located on the carrier substrate, the first layer comprising palladium impregnated on a support material comprising ceria in an amount of at least 45 weight-% based on the total weight of the support material, and optionally comprising platinum; b2) a second layer located on the first layer, the second layer comprising palladium and platinum each impregnated on a support material comprising a metal oxide; wherein the platinum to palladium weight ratio of the first layer is lower than the platinum to palladium weight ratio of the second layer. | 04-04-2013 |
20130172177 | SINTERING-STABLE HETEROGENEOUS CATALYSTS - A catalyst comprising (i) a support, (ii) metal particles and (iii) a shell which is arranged between the metal particles, wherein the shell (iii) comprises silicon oxide. | 07-04-2013 |
20140044627 | Preparation of Diesel Oxidation Catalyst Via Deposition of Colloidal Nanoparticles - The present invention relates to a process for preparing a catalyst, at least comprising the steps of adding a protecting agent to an aqueous solution of a metal precursor to give a mixture (M1), adding a reducing agent to mixture (M1) to give a mixture (M2), adding a support material to mixture (M2) to give a mixture (M3), adjusting the pH of mixture (M3), and separating the solid and liquid phase of mixture (M3). Furthermore, the present invention relates to the catalyst as such and its use as diesel oxidation catalyst. | 02-13-2014 |
20140260214 | NOx Storage Catalyst with lmproved Hydrothermal Stability and NOx Conversion | 09-18-2014 |
20140360171 | Catalyst With Improved Hydrothermal Stability - A catalyst for the treatment of exhaust gas emissions is disclosed. The catalyst can comprise ceria-alumina particles having a ceria phase present in a weight percent of the composite in the range of about 20% to about 80% on an oxide basis, an alkaline earth metal component supported on the ceria-alumina particles, wherein the CeO | 12-11-2014 |