Abstract:
A process for the production of mixed oxide particles comprising: (1) providing a dispersion comprising a disperse phase and a continuous phase, wherein the disperse phase comprises one or more precursor compounds of ceria, one or more precursor compounds of zirconia, and one or more precursor compounds of one or more rare earth oxides other than ceria and/or one or more precursor compounds of yttria; (2) forming an aerosol of the dispersion provided in step (1); and (3) pyrolyzing the aerosol of step (2) to obtain mixed oxide particles, as well as to mixed oxide particles obtainable from flame spray pyrolysis, and preferably obtainable by the process and to its use.
Abstract:
Provided are exhaust systems and components suitable for use in conjunction with gasoline engines to capture particulates in addition to reducing gaseous emission such as hydrocarbons, nitrogen oxides, and carbon monoxides. Exhaust treatment systems comprising a three-way conversion (TWC) catalyst located on a particulate filters are provided. Coated particle filters having washcoat loadings in the range of 1 to 4 g/ft result in minimal impact on back pressure while simultaneously providing TWC catalytic activity and particle trapping functionality to meet increasingly stringent regulations such as Euro 6, Sufficient to high levels of oxygen storage components (OSC) are also delivered on and/or within the filter. The filters can have a coated porosity that is substantially the same as its uncoated porosity. The TWC catalytic material can comprise a particle size distribution such that a first set of particles has a first d90 particle size of 7.5 µ?? or less and a second set of particles has a second d90 particle size of more than 7.5 µ??. Methods of making and using the same are also provided.
Abstract:
Provided are catalyst composites whose catalytic material is effective to substantially simultaneously oxidize carbon monoxide and hydrocarbons and reduce nitrogen oxides. The catalyst composites have a two-metal layer on a carrier, the two-metal layer comprising a rhodium component supported by a first support comprising a refractory metal oxide component or a first ceria-zirconia composite; a palladium component supported by a second support comprising a second ceria-zirconia composite; one or more of a promoter, stabilizer, or binder; wherein the amount of the total of the first and second ceria-zirconia composites in the two-metal layer is equal to or greater than the amount of the refractory metal oxide component. Methods of making and using the same are also provided.
Abstract:
Provided are exhaust systems and components suitable for use in conjunction with gasoline engines to capture particulates in addition to reducing gaseous emission such as hydrocarbons, nitrogen oxides, and carbon monoxides. Exhaust treatment systems comprising a three-way conversion (TWC) catalyst located on a particulate filters are provided. Coated particle filters having washcoat loadings in the range of 1 to 4 g/ft result in minimal impact on back pressure while simultaneously providing TWC catalytic activity and particle trapping functionality to meet increasingly stringent regulations such as Euro 6, Sufficient to high levels of oxygen storage components (OSC) are also delivered on and/or within the filter. The filters can have a coated porosity that is substantially the same as its uncoated porosity. The TWC catalytic material can comprise a particle size distribution such that a first set of particles has a first d90 particle size of 7.5 µ?? or less and a second set of particles has a second d90 particle size of more than 7.5 µ??. Methods of making and using the same are also provided.
Abstract:
Un sistema de tratamiento de emisiones corriente abajo de un motor de inyección directa de gasolina para el tratamiento de una corriente de escape que comprende hidrocarburos, monóxido de carbono, óxidos de nitrógeno y material en partículas, donde el sistema de tratamiento de emisiones comprende un filtro de material en partículas catalizado que comprende: un material catalítico de conversión de tres vías (TWC) que está recubierto sobre o dentro de un filtro de material en partículas de flujo de pared que tiene una porosidad no recubierta de al menos 55%; en el que el filtro de material en partículas catalizado tiene una porosidad recubierta que está dentro del 7% de la porosidad no recubierta del filtro de material en partículas, caracterizado porque el filtro de material en partículas tiene una distribución de tamaño de poro con dos picos distintos que tienen un primer tamaño de poro promedio en el intervalo de 10-30 mm y un segundo tamaño de poro promedio en el intervalo de 31-100 mm, y el material catalítico TWC comprende una distribución de tamaño de partícula con dos picos distintos, de manera que un primer conjunto de partículas tiene un primer tamaño de partícula d90 en el intervalo de 1 a 7.5 mm y un segundo conjunto de partículas tiene un segundo tamaño de partícula d90 en el intervalo de 7.6 mm a 100 mm.
Abstract:
Provided are catalyst composites whose catalytic material is effective to substantially simultaneously oxidize carbon monoxide and hydrocarbons and reduce nitrogen oxides. The catalyst composites have a two-metal layer on a carrier, the two-metal layer comprising a rhodium component supported by a first support comprising a refractory metal oxide component or a first ceria-zirconia composite; a palladium component supported by a second support comprising a second ceria-zirconia composite; one or more of a promoter, stabilizer, or binder; wherein the amount of the total of the first and second ceria-zirconia composites in the two-metal layer is equal to or greater than the amount of the refractory metal oxide component. Methods of making and using the same are also provided.
Abstract:
Se proveen sistemas de escape y componentes adecuados para usarse junto con motores a gasolina para capturar partículas además de reducir emisión gaseosa tal como hidrocarburos, óxidos de nitrógeno y monóxidos de carbono. Se proveen sistemas de tratamiento de escape comprendiendo un catalizador de conversión de tres vías (TWC) localizados en un filtro de partículas. Los filtros de partículas revestidos que tienen cargas de revestimiento lavable en el rango de 0.0032 a 0.012 kg/m da como resultado el impacto mínimo sobre la contrapresión mientras que provee simultáneamente la actividad catalítica de TWC en funcionalidad de trampa de partículas para cumplir con las normas crecientemente estrictas tales como Euro 6, suficiente para altos niveles de componentes de almacenamiento de oxígeno (OSC) también se proporcionan sobre y/o dentro del filtro. Los filtros pueden tener una porosidad revestida que es sustancialmente igual que su porosidad no revestida. El material catalítico de TWC puede comprender una distribución de tamaño de partícula de manera que un primer grupo de partículas tiene un primer tamaño de partículas de 7.5 µm y un segundo grupo de partículas tiene un segundo tamaño de partículas de d90 de más de 7.5 µm. También se proveen métodos para producir y usar los mismos.
Abstract:
Provided are exhaust systems and components suitable for use in conjunction with gasoline engines to capture particulates in addition to reducing gaseous emission such as hydrocarbons, nitrogen oxides, and carbon monoxides. Exhaust treatment systems comprising a three-way conversion (TWC) catalyst located on a particulate filters are provided. Coated particle filters having washcoat loadings in the range of 1 to 4 g/ft result in minimal impact on back pressure while simultaneously providing TWC catalytic activity and particle trapping functionality to meet increasingly stringent regulations such as Euro 6, Sufficient to high levels of oxygen storage components (OSC) are also delivered on and/or within the filter. The filters can have a coated porosity that is substantially the same as its uncoated porosity. The TWC catalytic material can comprise a particle size distribution such that a first set of particles has a first d90 particle size of 7.5 µ?? or less and a second set of particles has a second d90 particle size of more than 7.5 µ??. Methods of making and using the same are also provided.
Abstract:
compostos catalisadores automotivos com uma camada de dois metais. são fornecidos compostos catalisadores, cujo material catalítico é eficaz para substancialmente simultaneamente oxidar o monóxido de carbono e hidrocarbonetos e reduzir os óxidos de nitrogênio. os compostos catalisadores têm uma camada de dois metais em um transportador, a camada de dois metais compreendendo um componente de ródio suportado por um primeiro suporte que compreende um componente de óxido metálico refratário ou um primeiro composto de céria-zircônia; um componente de paládio suportado por um segundo suporte que compreende um segundo composto de céria-zircônia; um ou mais de um promotor, estabilizador ou ligante; em que a quantidade total do primeiro e do segundo compostos de céria-zircônia na camada de dois metais é igual ou maior do que a quantidade do componente de óxido metálico refratário. métodos para produzir e usar o mesmo também são fornecidos.