Abstract: A method is provided for controlling regeneration of an SCR catalyst. The method includes coordinating the regeneration duration and temperature (e.g., longer/shorter regenerations and/or lower/higher temperatures) to the urea deposit loading. In this way, improved regeneration may be achieved due to the particular nature of urea deposits on SCR catalysts.

Abstract: A method is provided for controlling regeneration of an SCR catalyst. The method includes coordinating the regeneration duration and temperature (e.g., longer/shorter regenerations and/or lower/higher temperatures) to the urea deposit loading. In this way, improved regeneration may be achieved due to the particular nature of urea deposits on SCR catalysts.

Abstract: A method is provided for controlling regeneration of an SCR catalyst. The method includes coordinating the regeneration duration and temperature (e.g., longer/shorter regenerations and/or lower/higher temperatures) to the urea deposit loading. In this way, improved regeneration may be achieved due to the particular nature of urea deposits on SCR catalysts.

Abstract: A method of regenerating a particulate filter utilizes two temperature levels, with the first, lower, level removing stored hydrocarbons and urea from an SCR catalyst. The second, higher, level then follows for filter regeneration. Because the regeneration occurs after the SCR catalyst has been purged of hydrocarbons and urea, for example, the temperature experienced by the SCR catalyst during regeneration is reduced. In this way, SCR degradation may be reduced.

Abstract: A method of regenerating a particulate filter in an apparatus comprising an internal combustion engine and a catalyst that employs urea as reductant for NOx is disclosed. The method comprises exposing the catalyst and particulate filter to a first, lower elevated exhaust temperature to remove urea deposits and/or stored hydrocarbon from the catalyst, and then exposing the catalyst and particulate filter to a second, higher elevated exhaust temperature to heat the particulate filter to decompose particulate matter in the particulate filter. In this manner, damage caused to the catalyst due to the decomposition and reaction of urea deposits and/or oxidation of stored hydrocarbon during particulate filter regeneration may be avoided.

Abstract: A method is provided for operating an aftertreatment device coupled downstream of an internal combustion engine, the aftertreatment device including a urea-based selective catalyst reduction (SCR) catalyst. The method comprises establishing a threshold urea deposit accumulation for regeneration of the SCR catalyst; determining that the threshold urea deposit accumulation in the SCR catalyst has been met; and in response to the determination, regenerating the SCR catalyst by maintaining the SCR catalyst at a predetermined regeneration temperature for a predetermined time interval.

Abstract: The present invention involves an exhaust gas catalyst and method of manufacturing same. The invention provides for a cost-effective material which lowers the cold-start emissions from the exhaust of vehicles. The invention is a passive system which accelerates the light-off temperature of catalyst in a cost-effective fashion. The invention includes a method of manufacturing an exhaust gas catalyst capable of lowering cold-start emissions including the steps of providing an oxide mixture having praseodymium and cerium, doping about 0–10% weight zirconium and about 0–10% weight yttrium to the oxide mixture, adding about 0–2% weight metal including palladium, platinum, or rhodium to the oxide mixture, mixing gamma aluminum to the oxide mixture for washcoating and washcoating the oxide mixture onto a monolithic substrate.

Abstract: An exhaust gas catalyst and method of manufacturing same. The invention provides for a cost-effective material which lowers the cold-start emissions from the exhaust of vehicles. The invention is a passive system which accelerates the light-off temperature of catalyst in a cost-effective fashion. The invention includes a method of manufacturing an exhaust gas catalyst capable of lowering cold-start emissions including the steps of providing an oxide mixture having praseodymium and cerium, doping about 0-10% weight zirconium and about 0-10% weight yttrium to the oxide mixture, adding about 0-2% weight metal including palladium, platinum, or rhodium to the oxide mixture, mixing gamma aluminum to the oxide mixture for washcoating and washcoating the oxide mixture onto a monolithic substrate.

Abstract: The present invention involves an exhaust gas catalyst and method of manufacturing same. The invention provides for a cost-effective material which lowers the cold-start emissions from the exhaust of vehicles. The invention is a passive system which accelerates the light-off temperature of catalyst in a cost-effective fashion. The invention includes a method of manufacturing an exhaust gas catalyst capable of lowering cold-start emissions including the steps of providing an oxide mixture having praseodymium and cerium, doping about 0-10% weight zirconium and about 0-10% weight yttrium to the oxide mixture, adding about 0-2% weight metal including palladium, platinum, or rhodium to the oxide mixture, mixing gamma aluminum to the oxide mixture for washcoating and washcoating the oxide mixture onto a monolithic substrate.

Abstract: The invention is a mixed oxide oxygen storage material useful as a catalyst or catalyst washcoat. The mixed oxide is praseodymium oxide loaded onto a support of either cerium oxide or cerium-zirconium oxide. The praseodymium oxide is loaded on the support so that the resultant mixed oxide contains praseodymium and cerium in a molar ratio of 1:4 to 4:1. This mixed oxide may be loaded with a catalyst like palladium for use in automotive exhaust gas systems.

Abstract: A method of milling a cerium-rich material for oxygen storage and oxygen release in an exhaust gas catalyst. The present invention provides a method of preparing a cerium-rich material that has enhanced oxygen storing and releasing properties for exhaust gas systems. The invention includes providing the cerium-rich material having oxides of about 60 wt. % ceria and oxides of about 40 wt. % lanthana and neodymia, and using high energy vibratory mechanical milling at a predetermined oscillation frequency and amplitude for a predetermined duration to preprepare the cerium-rich material until the cerium-rich material is at a substantially uniform molecular mixture of ceria, lanthana, and neodymia, by which the cerium-rich material's property of storing and releasing oxygen are enhanced.

Abstract: The present invention involves an exhaust gas catalyst and method of manufacturing same. The invention provides for a cost-effective material which lowers the cold-start emissions from the exhaust of vehicles. The invention is a passive system which accelerates the light-off temperature of catalyst in a cost-effective fashion. The invention includes a method of manufacturing an exhaust gas catalyst capable of lowering cold-start emissions including the steps of providing an oxide mixture having praseodymium and cerium, doping about 0-10% weight zirconium and about 0-10% weight yttrium to the oxide mixture, adding about 0-2% weight metal including palladium, platinum, or rhodium to the oxide mixture, mixing gamma aluminum to the oxide mixture for washcoating and washcoating the oxide mixture onto a monolithic substrate.

Abstract: The invention is a method for producing a metal oxide product by steps including absorbing a liquid solution of metal oxide precursors onto crystalline or microcrystalline, porous structured organic material capable of being combusted at elevated temperatures; heating the organic material containing the absorbed solution for a time and at a temperature sufficient to vaporize the liquid, convert the metal oxide precursors to metal oxides, and combust the organic material. The metal oxide products have been found to retain a high specific surface area (porous structure) even when subjected to elevated temperatures, which makes them ideally suited for use as catalyst materials.