Diesel oxidation catalyst with layered structure comprising ceria composition as palladium support material for enhanced hc and co gas conversion
A technology for oxidizing catalysts and supporting materials, applied in the field of ceria, which can solve the problems of enhanced catalytic activity of catalysts, unsatisfactory HC and CO, etc.
Active Publication Date: 2016-11-16
BASF SE +1
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Problems solved by technology
[0009] However, these state-of-the-art DOCs still show an unsatisfactory breakthrough of HC and CO
Furthermore, the hydrocarbon storage capacity of these state-of-the-art DOCs is enhanced at the expense of the catalytic activity of the catalyst
Method used
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[0128] 1. Catalyst Preparation
[0129] Sample A) of the present invention
[0130] For the first (bottom) layer, add palladium nitrate solution at 0.75 g / in 3 In highly porous gamma alumina, get 22g / ft 3 Pd. The resulting frit was dispersed in water and acetic acid and ground to particle size d 90 is 25 microns. 0.75g / in 3 Contains ZrO 2 : 43.5% by weight, CeO 2 :45% by weight, La 2 o 3 :8% by weight, Pr 6 o 11 : 2% by weight and HfO 2 : 1.5% of the material is dispersed into this slurry and ground to particle size d 90 is 7 microns. The final slurry was coated onto a monolith, dried at 110°C in air and calcined at 450°C in air.
[0131] For the second (middle) layer, apply 1.5g / in 3 Highly porous gamma alumina is impregnated with an aqueous solution of palladium nitrate to yield 30 g / ft 3 of the final dry Pd content. The resulting powder was dispersed in water. Platinum solution of Pt IV hydroxy complexes stabilized with platinum as amine was added to yield...
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Abstract
The present invention relates to a layered diesel oxidation catalyst (DOC) comprising: a) a carrier substrate; b) a diesel oxidation catalytic material comprising b1) a first layer on the carrier substrate, said first layer comprising an impregnated Palladium on a carrier material comprising ceria in an amount of at least 45% by weight, based on the total weight of the carrier material, and optionally platinum; b2) a second layer on the first layer, said second layer comprising Palladium and platinum impregnated on a support material comprising a metal oxide; wherein the platinum to palladium weight ratio of the first layer is lower than the platinum to palladium weight ratio of the second layer.
Description
technical field [0001] The invention relates to a layered oxidation catalyst, especially for treating diesel exhaust gases, comprising ceria as palladium support material. Background of the invention [0002] Operation of lean-burn engines, such as diesel engines and lean-burn gasoline engines, provides users with excellent fuel economy and has very low slip of gaseous hydrocarbons and carbon monoxide due to their operation at high air / fuel ratios under fuel-lean conditions . Diesel engines also offer significant advantages over gasoline engines in terms of their fuel economy, durability and their ability to generate high torque at low speeds, among others. Diesel engines, however, have more serious problems than their spark-ignited counterparts in terms of slippage. Emissions concerns particulate matter (PM), nitrogen oxides (NO x ), unburned hydrocarbons (HC) and carbon monoxide (CO). NO x A term used to describe various chemical species of nitrogen oxides, including ...
Claims
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IPC IPC(8): B01J23/44B01J23/42B01J37/025
CPCB01J23/42B01J23/44B01J37/0244B01J37/0246B01J21/04B01J23/63B01D53/944B01J29/068B01J29/7007B01J29/7057B01J29/7415B01J37/0036B01J37/0201B01J2229/42B01D53/9459B01D2253/108B01D2255/1021B01D2255/1023B01D2255/206B01D2255/2061B01D2255/2063B01D2255/2065B01D2255/2066B01D2255/20715B01D2255/20776B01D2255/9025B01D2255/912B01D2258/012B01J35/19B01J35/56B01J35/40
Inventor G·格鲁贝特T·纽鲍尔A·彭克M·希尔真多夫T·穆勒-斯塔奇O·格拉克X·魏J·霍克S·孙S·罗斯
Owner BASF SE