Ventura, CA, United States
Ventura, CA, United States
SEARCH FILTERS
Time filter
Source Type

Patent
CDTI | Date: 2017-04-12

The present disclosure describes rhodium iron catalysts of use in catalyst systems. Disclosed here are TWCs configured to include a substrate and one or more of a washcoat layer, an impregnation layer, and/or an overcoat layer. Disclosed herein are one or more of a washcoat layer and/or an overcoat layer formed using a slurry that includes one or more of an oxygen storage material, a refractory support oxide, iron, and rhodium. Disclosed herein are methods of preparing catalysts wherein a washcoat layer is deposited onto the substrate, one or more impregnation layers may be deposited onto the washcoat layer, one or more overcoat layers may be deposited onto the impregnation washcoat layer, and one or more additional impregnation layers may be deposited onto the one or more washcoat layers.


Sulfur-resistant synergized platinum group metals (SPGM) catalysts suitable for diesel oxidation are disclosed. Catalytic layers of SPGM catalyst samples contain a washcoat layer substantially free of PGM material (ZPGM). The SPGM catalyst includes a washcoat layer comprising YMn_(2)O_(5) (pseudobrookite) and an overcoat layer including a Pt/Pd composition with a total PGM loading of up to 176.6 g/m^(3) (5.0 g/ft^(3)). Resistance to sulfur poisoning and catalytic stability under sulfation conditions with high NO oxidation, and HC and CO conversion performances are observed.


The present disclosure describes zero-platinum group metals (ZPGM) material compositions including binary CuMn spinel oxide powders that possess stable reduction/oxidation (redox) reversibility useful for TWC and oxygen storage material (OSM) applications. The redox behavior of CuMn spinel oxide powders is analyzed under oxidation-reduction environments to determine spinel structure stability. The XRD, TPR and XPS analyses confirm the redox stability and reversibility of the CuMn spinel oxide.


Patent
CDTI | Date: 2016-06-14

The present disclosure describes zero-platinum group metals (ZPGM) material compositions including binary CuMn spinel oxide powders having stable reduction/oxidation (redox) reversibility useful for TWC and oxygen storage material applications. The behavior of CuMn spinel oxide powder is analyzed under oxidation-reduction environments to determine redox reversibility, catalytic activity, and spinel structure stability. Characterization of spinel powder is performed employing X-ray diffraction analysis, hydrogen temperature-programmed reduction technique, transmission electron microscopy analysis, and X-ray photoelectron spectroscopy analysis. Test results confirm the phase and structural stability of the CuMn spinel oxide during redox reaction, thereby indicating that the CuMn spinel oxide can be employed in a plurality of TWC applications.


The present disclosure describes support oxides, including include Niobium Oxide, which are employed in three-way catalytic (TWC) systems. Disclosed herein are TWC sample systems that are configured to include a substrate and one or more of a washcoat layer, an impregnation layer, and/or an overcoat layer. The disclosed one or more of washcoat layer and/or overcoat layer are formed using a slurry that includes an oxide mixture and an Oxygen Storage Material. The disclosed oxide mixtures include niobium oxide (Nb2O5), zirconia, and alumina. Further, other disclosed oxide mixtures additionally include NiO.


The present disclosure describes ZPGM material compositions including a CuMn_(2)O_(4 )spinel structure mixed with a plurality of support oxide powders to develop suitable ZPGM catalyst materials. Bulk powder ZPGM catalyst compositions are produced by physically mixing bulk powder CuMn_(2)O_(4 )spinel with different support oxide powders calcined at about 1000 C. XRD analyses are performed for bulk powder ZPGM catalyst compositions to determine CuMn spinel phase formation and phase stability for a plurality of temperatures to about 1000 C. ZPGM catalyst material compositions including CuMn_(2)O_(4 )spinel mixed with La_(2)O_(3), cordierite, and ceria-zirconia support oxides exhibit phase stability, which can be employed in ZPGM catalysts for a plurality of TWC applications, thereby leading to a more effective utilization of ZPGM catalyst materials with high thermal and chemical stability in TWC products.


The present disclosure describes ZPGM material compositions including LaMnO_(3 )perovskite structure mixed with a plurality of support oxide powders to develop suitable ZPGM catalyst materials. Bulk powder ZPGM catalyst compositions are produced by physically mixing bulk powder LaMnO_(3 )perovskite with different support oxide powders calcined at about 1000 C. XRD analyses are performed for bulk powder ZPGM catalyst compositions to determine LaMn perovskite phase formation and phase stability for a plurality of temperatures to about 1000 C. ZPGM catalyst material compositions including LaMn perovskite structure mixed with doped zirconia, La_(2)O_(3), cordierite, and ceria-zirconia support oxides present phase stability, which can be employed in ZPGM catalysts for a plurality of DOC applications, thereby leading to a more effective utilization of ZPGM catalyst materials with high thermal and chemical stability in DOC products.


Sulfur-resistant synergized platinum group metals (SPGM) catalysts with significant oxidation capabilities are disclosed. Catalytic layers of SPGM catalyst samples are prepared using conventional synthesis techniques to build a washcoat layer completely or substantially free of PGM material. The SPGM catalyst includes a washcoat layer comprising YMn_(2)O_(5 )(pseudobrookite) and an overcoat layer including a Pt/Pd composition with total PGM loading of at or below 5.0 g/ft^(3). Resistance to sulfur poisoning and catalytic stability is observed under 5.2 gS/L condition to assess significant improvements in NO oxidation, and HC and CO conversions.


A diesel oxidation catalyst (DOC) catalytic converter for at least the conversion of carbon monoxide and hydrocarbons, removal of a fraction of particulate matter, and decrease of sulfur trioxide emissions within exhaust gases from an engine and consequently of sulfuric acid, is disclosed. The DOC may include any suitable configuration including at least a substrate and a washcoat, where the substrate has a plurality of channels, suitable porosity, offers a three-dimensional support for the washcoat, and is made of any suitable material. The washcoat may be deposited on the substrate by any suitable method, and may include a mixture of at least one or more carrier material oxides and one or more catalysts. Suitable materials for the carrier material oxides may include titanium dioxide, tin dioxide, and zirconium dioxide, among others, excluding aluminum oxide (Al_(2)O_(3)), which may serve for a decrease of sulfur trioxide emissions and consequently of sulfuric acid mist. Suitable catalysts within the washcoat may include platinum, palladium, rhodium, and iridium, among others.


The invention generally relates to three-way catalysts and catalyst formulations capable of simultaneously converting nitrogen oxides, carbon monoxide, and hydrocarbons into less toxic compounds. Such three-way catalyst formulations contain ZrO_(2)-based mixed-metal oxide support oxides doped with an amount of lanthanide. Three-way catalyst formulations with the support oxides of the present invention demonstrate higher catalytic activity, efficiency and longevity than comparable catalysts formulated with traditional support oxides.

Loading CDTI collaborators
Loading CDTI collaborators