Patent application number | Description | Published |
20090158719 | Emission Treatment System - An emission treatment system and method for remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams are described. The emission treatment system has an oxidation catalyst upstream of a soot filter upstream from a NOx reducing catalyst. | 06-25-2009 |
20090288402 | Emission Treatment Catalysts, Systems and Methods - Zoned diesel oxidation catalysts containing a higher precious metal loading in the inlet zone that the outlet zone and an equal or shorter length inlet zone are described. Emission treatment systems and methods of remediating nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons using zoned diesel oxidation catalysts are also described. | 11-26-2009 |
20090304564 | NOx Storage Materials and Traps Resistant to Thermal Aging - Nitrogen oxide storage materials and methods of manufacturing nitrogen oxide storage materials are disclosed. The nitrogen oxide storage materials can be used to manufacture catalytic trap disposed in an exhaust passage of an internal combustion engine which is operated periodically between lean and stoichiometric or rich conditions, for abatement of NOx in an exhaust gas stream which is generated by the engine. In one embodiment, the nitrogen oxide storage material comprises alkaline earth material supported on ceria particles having a crystallite size of between about 10 and 20 nm and the alkaline earth oxide having a crystallite size of between about 20-40 nm. | 12-10-2009 |
20110173950 | Emissions Treatment System with Ammonia-Generating and SCR Catalysts - Provided are emissions treatment systems for an exhaust stream having an ammonia-generating component, such as a NOx storage reduction (NSR) catalyst or a lean NOx trap (LNT) catalyst, and an SCR catalyst disposed downstream of the ammonia-generating catalyst. The SCR catalyst can be a molecular sieve having the CHA crystal structure, for example SSZ-13 or SAPO-34, which can be ion-exchanged with copper. The LNT can be layered, having an undercoat washcoat layer comprising a support material, at least one precious metal, and at least one NOx sorbent selected from the group consisting of alkaline earth elements, rare earth elements, and combinations thereof and a top washcoat layer comprising a support material, at least one precious metal, and ceria in particulate form, the top washcoat layer being substantially free of alkaline earth components. The emissions treatment system is advantageously used for the treatment of exhaust streams from diesel engines and lean burn gasoline engines. | 07-21-2011 |
20110305612 | NOX STORAGE CATALYST WITH IMPROVED HYDROCARBON CONVERSION ACTIVITY - Described is a nitrogen oxide storage catalyst comprising:
| 12-15-2011 |
20110305613 | Fe-BEA/Fe-MFI Mixed Zeolite Catalyst And Process For The Treatment Of NOx In Gas Streams - Disclosed is a catalyst, preferably for use in selective catalytic reduction (SCR), said catalyst comprising one or more zeolites of the MFI structure type, and one or more zeolites of the BEA structure type, wherein at least part of the one or more zeolites of the MFI structure type and at least part of the one or more zeolites of the BEA structure type respectively contain iron (Fe). Furthermore, an exhaust gas treatment system is described, comprising said catalyst as well as a process for the treatment of a gas stream comprising NO | 12-15-2011 |
20110305614 | Cu-CHA/Fe-MFI Mixed Zeolite Catalyst And Process For The Treatment Of NOx In Gas Streams - Described is a catalyst, preferably for use in selective catalytic reduction (SCR), said catalyst comprising one or more zeolites of the MFI structure type, and one or more zeolites of the CHA structure type, wherein at least part of the one or more zeolites of the MFI structure type contain iron (Fe), and wherein at least part of the one or more zeolites of the CHA structure type contain copper (Cu). An exhaust gas treatment system is described, comprising said catalyst as well as a process for the treatment of a gas stream comprising NO | 12-15-2011 |
20120023915 | NOx Storage Materials and Traps Resistant to Thermal Aging - Nitrogen oxide storage materials and methods of manufacturing nitrogen oxide storage materials are disclosed. The nitrogen oxide storage materials can be used to manufacture catalytic trap disposed in an exhaust passage of an internal combustion engine which is operated periodically between lean and stoichiometric or rich conditions, for abatement of NOx in an exhaust gas stream which is generated by the engine. In one embodiment, the nitrogen oxide storage material comprises alkaline earth material supported on ceria particles having a crystallite size of between about 10 and 20 nm and the alkaline earth oxide having a crystallite size of between about 20-40 nm. | 02-02-2012 |
20130089483 | Cu-CHA/Fe-BEA Mixed Zeolite Catalyst And Process For The Treatment Of NOx In Gas Streams - The present invention relates to a catalyst, which may be used in selective catalytic reduction (SCR), said catalyst comprising one or more zeolites of the BEA structure type, one or more zeolites of the CHA structure type, and optionally one or more zeolites of the MFI structure type, wherein at least part of the one or more zeolites of the BEA structure type contain iron (Fe), wherein at least part of the one or more zeolites of the CHA structure type contain copper (Cu), and wherein at least part of the optional one or more zeolites of the MFI structure type contain iron (Fe). Furthermore, the present invention concerns an exhaust gas treatment system comprising said catalyst as well as a process for the treatment of a gas stream comprising NO using said catalyst as well. | 04-11-2013 |
20140047819 | Emissions Treatment System with Ammonia-Generating and SCR Catalysts - Provided are emissions treatment systems for an exhaust stream having an ammonia-generating component, such as a NOx storage reduction (NSR) catalyst or a lean NOx trap (LNT) catalyst, and an SCR catalyst disposed downstream of the ammonia-generating catalyst. The SCR catalyst can be a molecular sieve having the CHA crystal structure, for example SSZ-13 or SAPO-34, which can be ion-exchanged with copper. The LNT can be layered, having an undercoat washcoat layer comprising a support material, at least one precious metal, and at least one NOx sorbent selected from the group consisting of alkaline earth elements, rare earth elements, and combinations thereof and a top washcoat layer comprising a support material, at least one precious metal, and ceria in particulate form, the top washcoat layer being substantially free of alkaline earth components. The emissions treatment system is advantageously used for the treatment of exhaust streams from diesel engines and lean burn gasoline engines. | 02-20-2014 |
20140248200 | Emissions Treatment System with Ammonia-Generating and SCR Catalysts - Provided are emissions treatment systems for an exhaust stream having an ammonia-generating component, such as a NOx storage reduction (NSR) catalyst or a lean NOx trap (LNT) catalyst, and an SCR catalyst disposed downstream of the ammonia-generating catalyst. The SCR catalyst can be a molecular sieve having the CHA crystal structure, for example SSZ-13 or SAPO-34, which can be ion-exchanged with copper. The LNT can be layered, having an undercoat washcoat layer comprising a support material, at least one precious metal, and at least one NOx sorbent selected from the group consisting of alkaline earth elements, rare earth elements, and combinations thereof and a top washcoat layer comprising a support material, at least one precious metal, and ceria in particulate form, the top washcoat layer being substantially free of alkaline earth components. The emissions treatment system is advantageously used for the treatment of exhaust streams from diesel engines and lean burn gasoline engines. | 09-04-2014 |