摘要:
An exhaust gas purifying catalyst comprising a catalyst layer comprising two or more types of inorganic porous particles each having a different particle size, a catalytically active component, and voids, wherein; as a first characteristic, 50% or more by number of all the voids in the catalyst layer satisfies a condition of the following (formula 1); L/2/(πS)1/2≧2 . . . (formula 1) wherein S represents a void cross-sectional area, and L represents a void cross-sectional circumference in the (formula 1), and; as a second characteristic, in the void cross-sectional area in the catalyst layer, the average void radius, determined assuming that the void shape is a perfect circle, is 10 μm to 20 μm.
摘要:
An electrode composition for removing nitrogen oxide, includes: a catalytic material and an adsorption material, wherein the adsorption material is a perovskite material of formula AaBbO3-δ, wherein 0.9
摘要:
The disclosed exhaust gas purification catalyst carrier includes a modified aluminum borate which contains aluminum borate and at least one addition element selected from the group consisting of a rare earth element and an alkaline earth metal and which has an electronegativity of 2.732 or lower.
摘要:
Compositions and methods for the preparation of ZPGM oxidation catalyst systems are disclosed. ZPGM catalyst systems may be employed within catalytic converters under lean hydrocarbon, air to fuel ratio condition to oxidize toxic gases, such as carbon monoxide and other hydrocarbons that may be included in exhaust gas. ZPGM oxidation catalyst systems are completely free of PGM catalyst and may include: a substrate, a washcoat, and an overcoat. Washcoat may include silver as ZPGM catalyst, and carrier material oxides. Similarly, overcoat may include at least one ZPGM catalyst, carrier material oxides and OSMs. Overcoat of the disclosed ZPGM catalyst system may include copper and cerium as ZPGM catalysts. Suitable known in the art chemical techniques, deposition methods and treatment systems may be employed in order to form the disclosed ZPGM catalyst systems. ZPGM catalyst systems may include high surface area, low conversion temperature catalysts that may exhibit high efficiency in the conversion of exhaust gases.
摘要:
An exhaust gas purification catalyst includes a composite oxide support, and a precious metal catalyst supported on the composite oxide support. The composite oxide support includes alumina, zirconia, ceria, a first additive element oxide and a second additive element oxide. The first additive element oxide contains an additive element selected from the group consisting of rare earth elements excluding cerium and alkali earth elements. The second additive element oxide contains an additive element selected from the group consisting of rare earth elements excluding cerium and alkali earth elements. In the composite oxide support, alumina is contained in a range of 30 to 40% by mass and zirconia is contained in a range of 36 to 46% by mass.
摘要:
An exhaust gas purification catalyst including a catalyst support and bimetallic particles supported thereon, wherein said bimetallic particles include an at least partial solid solution of rhodium and iridium and have a diffraction peak at 40.66°
摘要:
A method is described of producing a composite oxygen ion membrane and a composite oxygen ion membrane in which a porous fuel oxidation layer and a dense separation layer and optionally, a porous surface exchange layer are formed on a porous support from mixtures of (Ln1-xAx)wCr1-yByO3-δ and a doped zirconia. Preferred materials are (La0.8Sr0.2)0.95Cr0.7Fe0.3O3-δ for the porous fuel oxidation layer, (La0.8Sr0.2)0.95Cr0.5Fe0.5O3-δ for the dense separation layer, and (La0.8Sr0.2)0.95Cr0.3Fe0.7O3-δ for the porous surface exchange layer. Firing the said fuel activation and separation layers in nitrogen atmosphere unexpectedly allows the separation layer to sinter into a fully densified mass.
摘要:
Stabilized palladium (+1) compounds to mimic rhodium's electronic configuration and catalytic properties are disclosed. Palladium (+1) compounds may be stabilized in perovskite or delafossite structures and may be employed in Three-Way Catalysts (TWC) for at least the conversion of HC, CO and NOx, in exhaust gases. The TWC may include a substrate, a wash-coat and, a first impregnation layer, a second impregnation layer and an over-coat. The second impregnation layer and the over-coat may include palladium (+1) based compounds as catalyst.
摘要:
Close-coupled catalysts (CCC) for TWC applications are disclosed. The novel CCCs are implemented using light-weighted ceramic substrates in which a thin coating employing a low loading of Iron (Fe)-activated Rhodium (Rh) material composition, with Iron loadings and an OSM of Ceria-Zirconia, are deposited onto the substrates. Different CCC samples are produced to determine and/or verify improved light-off (LO) and NOX conversion of the CCCs. Other CCC samples produced are a CCC including a standard (non-activated) Rh thin coating and a heavily loaded CCC with a single coating of Pd/Rh material composition. The CCC samples are aged under dyno-aging using the multi-mode aging cycle and their performance tested using a car engine with ports on the exhaust to measure the emissions, according to the testing protocol in the Environmental Protection Agency Federal Test Procedure 75. During testing, the thin coatings of Fe-activated Rh exhibit improved light-off and NOx conversion efficiency.
摘要:
Variations of metal oxide materials used as support oxide for Cu—Mn spinel powder for ZPGM TWC applications are disclosed. Bulk powder catalyst samples of Cu—Mn spinel structure on MgAl2O4, Al2O3-9% BaO, Al2O3—SrO, Al2O3—CeO, CeO2—ZrO2 support oxides and among others are prepared using incipient wetness method. BET-surface area analysis is performed for selected support oxides before and after deposition of Cu—Mn spinel to analyze thermal stability. XRD analysis is performed for bulk powder catalyst samples to investigate Cu—Mn spinel phase formation, and phase stability for a plurality of temperatures to about 1000° C. Activity measurements under isothermal steady state sweep test condition may be performed under rich condition to lean condition for different aging temperature at about 800° C. and about 1000° C. Catalytic activity of samples may be compared to analyze the influence that selected support oxides may have on thermal stability and TWC performance of ZPGM materials for a plurality of TWC applications.