Patent application number | Description | Published |
20100043402 | PASSIVE AMMONIA-SELECTIVE CATALYTIC REDUCTION FOR NOx CONTROL IN INTERNAL COMBUSTION ENGINES - A method for operating an internal combustion engine includes controlling the engine to a preferred air/fuel ratio to generate an engine-out exhaust gas feedstream including preferred concentrations of nitric oxide, carbon monoxide, and hydrogen, converting the nitric oxide, carbon monoxide, and hydrogen to ammonia across a first catalytic device; and storing the ammonia on an ammonia-selective catalytic reduction device fluidly serially connected downstream of the first catalytic device. | 02-25-2010 |
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 |
20100192545 | EXHAUST AFTERTREATMENT SYSTEM - An exhaust aftertreatment system connected to an internal combustion engine operative lean of stoichiometry includes first and second selective catalytic reactor devices. A preferred ratio of hydrocarbon:NOx to achieve a preferred concentration of ammonia immediately downstream of the first selective catalytic reactor device is determined. An ethanol-based reductant is dispensed upstream of the first selective catalytic reactor device. | 08-05-2010 |
20100209329 | CATALYST FOR PRODUCING AMMONIA FROM HYDROCARBON AND NITROGEN OXIDES - Provided is a process for producing ammonia by the catalytic reduction of nitrogen oxide in the presence of a hydrocarbon, and in certain embodiments, in the presence of an oxygenated hydrocarbon. | 08-19-2010 |
20100307140 | METHOD TO MONITOR HC-SCR CATALYST NOX REDUCTION PERFORMANCE FOR LEAN EXHAUST APPLICATIONS - A method for initiating a regeneration mode in selective catalytic reduction device utilizing hydrocarbons as a reductant includes monitoring a temperature within the aftertreatment system, monitoring a fuel dosing rate to the selective catalytic reduction device, monitoring an initial conversion efficiency, selecting a determined equation to estimate changes in a conversion efficiency of the selective catalytic reduction device based upon the monitored temperature and the monitored fuel dosing rate, estimating changes in the conversion efficiency based upon the determined equation and the initial conversion efficiency, and initiating a regeneration mode for the selective catalytic reduction device based upon the estimated changes in conversion efficiency. | 12-09-2010 |
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 |
20110072790 | METHOD AND APPARATUS FOR MONITORING A HYDROCARBON-SELECTIVE CATALYTIC REDUCTION DEVICE - A method for monitoring a hydrocarbon-selective catalytic reactor device of an exhaust aftertreatment system of an internal combustion engine operating lean of stoichiometry includes injecting a reductant into an exhaust gas feedstream upstream of the hydrocarbon-selective catalytic reactor device at a predetermined mass flowrate of the reductant, and determining a space velocity associated with a predetermined forward portion of the hydrocarbon-selective catalytic reactor device. When the space velocity exceeds a predetermined threshold space velocity, a temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is determined, and a threshold temperature as a function of the space velocity and the mass flowrate of the reductant is determined. If the temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is below the threshold temperature, operation of the engine is controlled to regenerate the hydrocarbon-selective catalytic reactor device. | 03-31-2011 |
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 |
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 |
20120079813 | OPERATING METHODS FOR SELECTIVE CATALYTIC REDUCTION OF NOx - Where oxygenated hydrocarbons, such as ethanol, may be considered for use as a reductant to be added to diesel or gasoline engine exhaust for promoting the catalyzed reduction of NOx to N | 04-05-2012 |
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 |
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 |
20130061576 | SELECTIVE CATALYTIC REDUCTION (SCR) DEVICE CONTROL SYSTEM - An exhaust gas treatment system for an internal combustion engine is provided, including an exhaust gas conduit, an oxidation catalyst (“OC”) device, an electrically heated catalyst (“EHC”) device, a selective catalytic reduction (“SCR”) device, and a control module. The OC device is in fluid communication with the exhaust gas conduit. The OC device adsorbs hydrocarbons and is selectively activated to induce oxidation of the hydrocarbons in the exhaust gas. The EHC device is in fluid communication with the exhaust gas conduit and is configured to receive the exhaust gas. The EHC device is located within the OC device and is selectively activated to produce heat and induce further oxidation of the exhaust gas. The EHC device has an oxidation catalyst compound disposed thereon for converting nitrogen oxide (“NO”) to nitrogen dioxide (“NO | 03-14-2013 |
20130074474 | ENGINE OFF NH3 BASED SELECTIVE CATALYTIC REDUCTION NOX ADSORBER - An exhaust treatment system for an engine includes a selective catalyst reduction (SCR) treatment module that controls a valve and an air pump to deliver air to an SCR catalyst in response to the engine turning off. An SCR loading module controls the valve and the air pump to deliver air to an exhaust manifold and controls a dosing system to deliver a dosing agent upstream of the SCR catalyst when a temperature of the SCR catalyst is less than a temperature threshold and the SCR catalyst is not saturated with ammonia. | 03-28-2013 |
20130074477 | ON-BOARD DIAGNOSTIC METHOD FOR NO2 FORMATION IN AN OXIDATION CATALYST - The capacity of a platinum-containing diesel oxidation catalyst (DOC) to simultaneously convert NO to NO | 03-28-2013 |
20130091826 | COLD START NO2 GENERATION SYSTEM - A cold start NO | 04-18-2013 |
20130152553 | Selective Catalytic Reduction (SCR) System For NOx Storage - An exhaust gas treatment system for an internal combustion engine is provided, including an exhaust gas conduit, a flow-through container of absorbent particles, an electrically heated catalyst (“EHC”) device, a selective catalytic reduction (“SCR”) device, and a control module. The exhaust gas conduit is in fluid communication with, and is configured to receive an exhaust gas from the internal combustion engine. The exhaust gas contains oxides of nitrogen (“NO | 06-20-2013 |
20130239552 | CONTROL SYSTEM FOR REDUCING NITROUS OXIDE ("N2O") AFTER SELECTIVE CATALYTIC REDUCTION ("SCR") DEVICE LIGHT-OFF - An exhaust gas treatment system for an internal combustion engine is provided having an exhaust gas conduit, an oxidation catalyst (“OC”) device, a selective catalytic reduction (“SCR”) device, and a control module. The internal combustion engine has at least one operating parameter. The exhaust gas conduit is in fluid communication with, and is configured to receive an exhaust gas from the internal combustion engine. The exhaust gas contains oxides of nitrogen (“NO | 09-19-2013 |
20130294989 | NITRIC OXIDE OXIDATION OVER SILVER-BASED CATALYSTS | 11-07-2013 |
20130294990 | SILVER PROMOTED CLOSE-COUPLED NOx ABSORBER | 11-07-2013 |