Patent application number | Description | Published |
20090193792 | METHOD AND APPARATUS FOR MANAGING AN EXHAUST GAS FEEDSTREAM FOR A SPARK-IGNITION DIRECT-INJECTION ENGINE - The disclosure sets forth operating a spark-ignition, direct-fuel injection internal combustion engine equipped with an exhaust aftertreatment system including a lean-NOx reduction catalyst upstream of a second converter element. The engine preferentially operates in one of a homogeneous charge combustion mode and a stratified charge combustion mode based upon temperature of the lean-NOx reduction catalyst. Exhaust gas flow is selectively diverted to the second converter element. | 08-06-2009 |
20090199547 | METHOD AND APPARATUS FOR EXHAUST AFTERTREATMENT IN A SPARK-IGNITION DIRECT-INJECTION INTERNAL COMBUSTION ENGINE - The disclosure sets forth a spark-ignition, direct-fuel injection internal combustion engine selectively operative at an air/fuel ratio lean of stoichiometry and fluidly connected to an exhaust aftertreatment system. The exhaust aftertreatment system consists essentially of an electro-thermal heating element adjoining a converter element. A control system comprising a control module is signally connected to a sensing device and adapted to monitor a temperature of the converter element and operatively connected to the engine and operative to connect the electro-thermal heating element to an electric power source. | 08-13-2009 |
20100057328 | LEAN NITROGEN OXIDE EMISSION CONTROL SYSTEM AND METHOD - A control system comprising an NH | 03-04-2010 |
20100086458 | METHOD AND ARCHITECTURE FOR OXIDIZING NITRIC OXIDE IN EXHAUST GAS FROM HYDROCARBON FUEL SOURCE WITH A FUEL LEAN COMBUSTION MIXTURE - An after-treatment system architecture and method for oxidizing the nitric oxide component of an exhaust stream from a hydrocarbon fueled power source operated with a fuel lean combustion mixture. | 04-08-2010 |
20100107605 | PASSIVE AMMONIA-SELECTIVE CATALYTIC REDUCTION FOR NOx CONTROL IN INTERNAL COMBUSTION ENGINES - Engine exhaust gas feedstream NOx emissions aftertreatment includes a catalytic device connected upstream of an ammonia-selective catalytic reduction device including a base metal. Engine operation can be modulated to generate an engine-out exhaust gas feedstream that converts to ammonia on the catalytic device. The ammonia is stored on the ammonia-selective catalytic reduction device, and used to reduce NOx emissions in the exhaust gas feedstream. | 05-06-2010 |
20100107606 | PASSIVE AMMONIA-SELECTIVE CATALYTIC REDUCTION FOR NOx CONTROL IN INTERNAL COMBUSTION ENGINES - Engine exhaust gas feedstream NOx emissions aftertreatment includes a catalytic device and first and second ammonia selective catalytic reduction devices. The first and second ammonia-selective catalytic reduction devices each includes a base metal. Engine operation can be modulated to generate an engine-out exhaust gas feedstream that converts to ammonia. The ammonia is stored on the first and second ammonia selective catalytic reduction devices and used to reduce NOx emissions in the exhaust gas feedstream. | 05-06-2010 |
20100139248 | METHOD AND APPARATUS FOR CONTROLLING OPERATION OF A SPARK-IGNITION DIRECT-INJECTION ENGINE - Operation of a spark ignition, direct injection engine having an aftertreatment system including an oxidation catalyst and a selective catalyst reduction device is described. The method includes controlling to a stoichiometric air/fuel ratio and retarding spark ignition timing. Engine fueling is then controlled to a lean air/fuel ratio and spark is retarded. The engine is then operated to generate ammonia reductant. Engine operation then comprises operating at a preferred air/fuel ratio and controlling spark ignition timing to a preferred timing. | 06-10-2010 |
20100139251 | METHOD AND APPARATUS FOR CONTROLLING EXHAUST EMISSIONS IN A SPARK-IGNITION DIRECT-INJECTION ENGINE - Exhaust emissions from a spark-ignition direct-injection engine connected to an oxidation catalytic device and a selective catalyst reduction device having a capacity to store ammonia reductant are controlled. The engine operates in a first combustion mode to generate ammonia reductant, stored on the second aftertreatment device. The engine operates lean of stoichiometry and nitrides of oxygen in the exhaust gas feedstream are reduced on the second aftertreatment device. | 06-10-2010 |
20100186390 | TECHNIQUE FOR PRODUCTION OF AMMONIA ON DEMAND IN A THREE WAY CATALYST FOR A PASSIVE SELECTIVE CATALYTIC REDUCTION SYSTEM - A method for controlling a powertrain includes selectively initiating an ammonia generation cycle, including injecting fuel into a combustion chamber of an engine before a primary combustion event to a calibrated air fuel ratio in a range lean of stoichiometry based upon generation of NOx within the combustion chamber, injecting fuel into the combustion chamber after the primary combustion event based upon an overall air fuel ratio in a range rich of stoichiometry and resulting generation of molecular hydrogen, and utilizing a catalyst device between the engine and a selective catalytic reduction device to produce ammonia. | 07-29-2010 |
20100186391 | TECHNIQUE FOR PRODUCTION OF AMMONIA ON DEMAND IN A THREE WAY CATALYST FOR A PASSIVE SELECTIVE CATALYTIC REDUCTION SYSTEM - A method for controlling a powertrain includes selectively initiating an ammonia generation cycle including injecting fuel into a combustion chamber of an engine before a primary combustion event to a calibrated air fuel ratio in a range lean of stoichiometry based upon generation of NOx within the combustion chamber, injecting fuel into the powertrain after the primary combustion event based upon an overall air fuel ratio in a range rich of stoichiometry and resulting generation of molecular hydrogen, utilizing a hydrogen forming catalyst to reform the injected fuel, and utilizing a catalyst device between the engine and the selective catalytic reduction device to produce ammonia. | 07-29-2010 |
20100191437 | METHOD AND SYSTEM FOR MONITORING AN ACTIVE HYDROCARBON ADSORBER - A method and system for monitoring an exhaust gas adsorber includes a comparison module comparing the first exhaust gas constituent signal corresponding to an amount of exhaust gas constituent in an exhaust conduit and a second exhaust gas constituent signal corresponding to an amount of exhaust gas constituent in the exhaust gas adsorber. The system includes a fault module generating a fault in response to comparing in the comparison module. | 07-29-2010 |
20100229533 | PEROVSKITE-TYPE COMPOUNDS FOR USE IN LEAN NOx TRAPS - An exhaust aftertreatment system for a lean-burn engine may include a lean NO | 09-16-2010 |
20100233045 | SULFUR TOLERANT PEROVSKITE SUPPORTED CATALYSTS - A sulfur tolerant oxidation catalyst with appreciable NO and HC oxidation capabilities has been developed for use in any component of an exhaust aftertreatment system for a lean-burn engine where the oxidation of at least NO is desired. Several non-exclusive examples of such components where the oxidation catalyst may be employed include a DOC and a LNT. The oxidation catalyst may comprise perovskite oxide particles that support palladium particles. The ability of the palladium supported perovskite oxide particles to concurrently oxidize NO and HC's can significantly diminish or altogether eliminate the use of platinum in the exhaust aftertreatment system for at least NO oxidation. The oxidation catalyst, moreover, may exhibit superior thermal durability and better NO and HC oxidation activities than platinum in some instances. | 09-16-2010 |
20100293930 | METHOD AND APPARATUS FOR AMMONIA FORMATION IN A CATALYTIC CONVERTER - An exhaust gas aftertreatment system for treating an engine-out exhaust gas feedstream of a spark-ignition direct-injection engine includes a multi-stage catalytic converter comprising a converter inlet, a converter outlet, and a substrate having a first end associated with the converter inlet and a second end associated with the converter outlet. The substrate further includes a multiplicity of flow passages between the first and second ends of the substrate, a first surface location corresponding to the first end of the substrate, and a second surface location corresponding to the second end of the substrate. A first washcoat stage is applied to the substrate at the first surface location corresponding to the first end of the substrate. A second washcoat stage is applied to the substrate at the second surface location corresponding to the second end of the substrate. The first and second washcoat stages include washcoats formulated to generate hydrogen and ammonia from the engine-out exhaust gas feedstream. An ammonia-selective catalytic reduction device is downstream of the first and second washcoat stages. | 11-25-2010 |
20110070139 | CATALYST COMBINATIONS AND METHODS AND SYSTEMS FOR OXIDIZING NITRIC OXIDE IN A GAS STREAM - One embodiment of the invention may include a product comprising a catalyst combination comprising a perovskite catalyst and a second catalyst that is not a perovskite catalyst. | 03-24-2011 |
20110076212 | METHODS AND SYSTEMS FOR OXIDIZING NITRIC OXIDE IN A GAS STREAM - An after-treatment system architecture and method for oxidizing the nitric oxide component of a gas stream. | 03-31-2011 |
20110082030 | WASHCOATING TECHNIQUE FOR PEROVSKITE CATALYSTS - Precursor cations of A and B elements of an ABO | 04-07-2011 |
20110082031 | METHOD AND SYSTEM FOR MONITORING A HYDROCARBON ADSORBER - A catalyst and method of forming the catalyst includes a catalyst body having hydrocarbon adsorber material and oxygen storage capacity material disposed thereon. | 04-07-2011 |
20110202253 | FUEL EFFICIENT AMMONIA GENERATION STRATEGY FOR LEAN-BURN ENGINES UTILIZING PASSIVE NH3-SCR FOR THE CONTROL OF NOX - A method and system for operating an ammonia generation cycle in an internal combustion engine and a connected aftertreatment system includes monitoring a parameter of engine operation, comparing the parameter of engine operation to a threshold delineating operation of the engine in one of a stoichiometric operation and rich operation, and operating the ammonia generation cycle based upon the comparing indicating the parameter of engine operation exceeding the threshold. | 08-18-2011 |
20120036834 | Mn, Ce and Zr MIXED OXIDES OXIDATION CATALYST - The oxidation of nitrogen oxide (NO) in an oxygen-containing exhaust gas flow from a diesel or other lean-burn engine may be catalyzed using particles of co-precipitated and calcined manganese (Mn), cerium (Ce) and zirconium (Zr) mixed oxides. In preferred embodiments, the molar ratios of Mn, Ce and Zr to the total amount of base metals in the ternary mixed oxide catalyst are in the range of 0.25-0.35, 0.40-0.50 and 0.20-0.25, respectively. Further, this ternary mixed oxide catalyst is less susceptible to sulfur poisoning than previously-disclosed binary mixed oxide catalysts. The ternary mixed oxide catalyst may also be regenerated—and the inhibiting effect of SO | 02-16-2012 |
20120042631 | CATALYST MATERIALS FOR AMMONIA OXIDATION IN LEAN-BURN ENGINE EXHAUST - An exhaust aftertreatment system and a method for treating exhaust produced by a lean-burn engine are provided. The exhaust aftertreatment system may include an exhaust gas treatment subsystem and a clean-up oxidation catalyst located downstream of the exhaust gas treatment subsystem. The clean-up oxidation catalyst can selectively oxidize NH | 02-23-2012 |
20120055138 | METHODS FOR ENGINE EXHAUST NOX CONTROL USING NO OXIDATION IN THE ENGINE - A powertrain includes an internal combustion engine having a combustion chamber and an aftertreatment system. A method for reducing NOx emissions in the powertrain includes monitoring an actual exhaust gas feedstream ratio of NO | 03-08-2012 |
20120060472 | CATALYST MATERIALS FOR NOx OXIDATION IN AN EXHAUST AFTERTREATMENT SYSTEM THAT USES PASSIVE AMMONIA SCR - An exhaust aftertreatment system that receives an exhaust flow from a lean-burn engine and a method for treating the exhaust flow are described. The exhaust aftertreatment system may include a three-way-catalyst, an oxidation catalyst, and a NH | 03-15-2012 |
20120134907 | COATED PEROVSKITE-BASED CATALYSTS, CATALYST COMBINATIONS AND METHODS OF TREATING A GAS STREAM - One embodiment of the invention includes a method of treating a gas stream comprising flowing the gas stream over a hydrocarbon reduction and NO | 05-31-2012 |
20120157301 | METHOD FOR PREPARING PEROVSKITE OXIDE-BASED CATALYST PARTICLES - A high-surface area fine particle dispersal of LaMnO | 06-21-2012 |
20120159927 | PEROVSKITE OXIDE COMPOUNDS FOR USE IN EXHAUST AFTERTREATMENT SYSTEMS - A method for removing NO | 06-28-2012 |
20120159935 | PEROVSKITE-BASED CATALYSTS, CATALYST COMBINATIONS AND METHODS OF MAKING AND USING THE SAME - One embodiment of the invention may include a method comprising providing a product comprising a substrate comprising a perovskite catalyst, NO | 06-28-2012 |
20120167553 | EXHAUST AFTERTREATMENT SYSTEMS THAT INCLUDE AN AMMONIA-SCR CATALYST PROMOTED WITH AN OXYGEN STORAGE MATERIAL - A low-oxygen content exhaust flow produced by an engine that is combusting, on average, a stoichiometric mixture of air and fuel generally contains various unwanted gaseous emissions. The exhaust flow is treated by an exhaust aftertreatment system that includes a three-way-catalyst (TWC) and an ammonia-selective catalytic reduction (ammonia-SCR) catalyst positioned downstream from the TWC in a flow direction of the exhaust flow. The ammonia-SCR catalyst includes (1) a base metal ion-substituted zeolite and/or a base metal ion-substituted silicoaluminophosphate and (2) an oxygen storage material selected from the group consisting of a metal oxide or a mixed metal oxide that exhibits oxygen storage and release capacity. The serial arrangement of the TWC and the ammonia-SCR catalyst enhances the conversion of NO | 07-05-2012 |
20120180558 | METHOD FOR MONITORING EXHAUST GAS AFTERTREATMENT DEVICES - A method for monitoring performance of a passive selective catalytic reduction system includes operating the internal combustion engine in a preconditioning mode. Subsequent to the preconditioning, an air/fuel excursion is introduced into the exhaust gas feedstream and a signal output from a sensor monitoring the exhaust gas feedstream in the selective catalytic reduction system during the air/fuel excursion is monitored. An operating effectiveness is determined for the selective catalytic reduction system correlated to the signal output from the sensor monitoring the exhaust gas feedstream. | 07-19-2012 |
20120183467 | LOW TEMPERATURE OXIDATION OF AMMONIA IN NITRIC ACID PRODUCTION - Ammonia in a gas stream comprising oxygen and nitrogen may be effectively completely oxidized to a mixture of NO and NO | 07-19-2012 |
20120191288 | ON-BOARD DIAGNOSTICS SYSTEM AND METHOD - An on-board diagnostics system and method are disclosed for a vehicle having an engine and an exhaust system. The system includes a modified selective catalytic reduction catalyst coupled to the engine via the exhaust system, where the modified selective catalytic reduction catalyst includes oxygen storage components. An upstream oxygen sensor is disposed in the exhaust pipe upstream of the modified selective catalytic reduction catalyst and a downstream oxygen sensor is disposed in the exhaust pipe downstream from the modified selective catalytic reduction catalyst. An engine control module receives data from the upstream and downstream oxygen sensors and determines a lifespan of the modified selective catalytic reduction catalyst based upon the data from the upstream and downstream oxygen sensors. | 07-26-2012 |
20120210696 | LOW TEMPERATURE NOx STORAGE SYSTEM FOR LEAN EXHAUST AFTERTREATMENT - Following a cold start of a hydrocarbon-fueled engine operated in a lean-burn-combustion mode, several seconds and minutes may be required for the exhaust gas stream to heat exhaust treatment devices in the exhaust system and conduit to their effective operating temperatures. The warm-up period may be particularly long for a NOx reduction catalyst (SCR) located downstream in the exhaust flow system. Accordingly, a bed of absorbent material, such as a suitably sized bed of alumina particles, located upstream of the SCR, is used to temporarily absorb water and NOx from a relatively cold exhaust until the exhaust has suitably heated the SCR to its operating temperature. Then, the warmed exhaust will remove the water and NOx from their temporary storage material and carry them to the reduction catalyst. | 08-23-2012 |
20120240554 | MANGANESE-BASED OXIDES PROMOTED LEAN NOx TRAP (LNT) CATALYST | 09-27-2012 |
20120291420 | OXIDATION CATALYSTS FOR ENGINES PRODUCING LOW TEMPERATURE EXHAUST STREAMS - The oxidation of carbon monoxide (CO) and hydrocarbons (HC) in an oxygen-containing gas stream, such as the exhaust stream from a diesel engine, or other lean-burn engine, may be catalyzed using a combination of mixed oxide particles of cerium, zirconium and copper, and discrete particles of an alumina-supported platinum group metal catalyst. The catalyzed oxidation of CO and HC by this combination of oxidation catalyst particles is effective at temperatures below 300° C. | 11-22-2012 |
20120304624 | NON-STOICHIOMETRIC PEROVSKITE OXIDE OXIDATION CATALYST FOR OXIDIZING NO TO NO2 - A non-stoichiometric perovskite oxide having the general chemical formula La | 12-06-2012 |
20130019589 | EXHAUST AFTERTREATMENT SYSTEM FOR COMPRESSION-IGNITION ENGINES - An internal combustion engine configured to operate in a compression-ignition combustion mode includes an exhaust aftertreatment system. The exhaust aftertreatment system includes a catalyst device fluidly coupled upstream of an ammonia-selective catalytic reduction device. The, catalyst device includes first, second, and third elements fluidly coupled in series. The first element includes a three-way catalytic element, the second element includes a NOx adsorber, and the third element includes an oxidation catalytic element. | 01-24-2013 |
20130108544 | SCR CATALYSTS PREPARATION METHODS | 05-02-2013 |
20130111876 | LOW COST LEAN NOx REDUCTION CATALYST SYSTEM - An exhaust aftertreatment system that includes a suitable combination of particulate catalyst materials is used to effectively reduce an amount of NO | 05-09-2013 |
20130294989 | NITRIC OXIDE OXIDATION OVER SILVER-BASED CATALYSTS | 11-07-2013 |
20130294990 | SILVER PROMOTED CLOSE-COUPLED NOx ABSORBER | 11-07-2013 |
20140161718 | SYNTHESIS OF Cu/SAPO-34 WITH VARIABLE COPPER LOADINGS - A Cu-amine complex of hydrated copper sulfate and ethylene diamine or an oligomer of ethylene diamine is employed in a direct (one-pot) synthesis of a copper-cation containing silicoaluminophosphate (SAPO) zeolite material having the Cu/SAPO-34 structure. The copper-amine complex is included in an aqueous gel of precursors of the SiO | 06-12-2014 |