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Zoned catalysts for diesel applications

A technology for oxidation catalysts and diesel oil, which is applied in molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., and can solve problems such as weak activity

Active Publication Date: 2012-03-21
BASF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, palladium has been shown to be suitable for use with platinum in DOC catalysts to reduce the amount of platinum required, although it is more sulfur sensitive and less active (on a weight basis)

Method used

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  • Zoned catalysts for diesel applications
  • Zoned catalysts for diesel applications
  • Zoned catalysts for diesel applications

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] Preparation of catalyst composite

[0052] The catalyst composite of the present invention can be formed into a single layer or multiple layers. In some cases, it is suitable to prepare a slurry of the catalytic material and use the slurry to form multiple layers on the carrier. The complex can be easily prepared by well-known procedures. A representative process is described below. The term "washcoat" as used herein has a general meaning in the art, and refers to a thin adherent washcoat of catalytic material or other materials coated on a substrate carrier material, such as a honeycomb-type carrier An element that is sufficiently porous to allow the air flow to be processed to pass through the channel.

[0053] The catalyst composite layer can be easily prepared on a single support. For the first layer of a specific washcoat layer, ground particles of high specific surface area refractory metal oxide (for example, γ-alumina) are made into a slurry in a suitable medium ...

Embodiment

[0085] Reference sample A

[0086] By applying an aqueous slurry containing Pt and Pd on a cordierite honeycomb monolithic substrate (400cpsi, wall thickness 4mil) of "diameter 4.66" by length 6"", using the Pd on OSC and alumina on A homogeneous mixture of Pt prepares a wash-coated Pt / Pd catalyst composite. The total carrying capacity of precious metals is 110g / ft 3 , The ratio of Pt / Pd is 1:2. The water-based slurry containing Pt and Pd is prepared as follows:

[0087] Use standard incipient wetness impregnation technique to impregnate with water-soluble Pd salt containing 20% ​​ceria, 6% neodymium oxide, 6% lanthanum oxide and 68% zirconium oxide and have a diameter of approximately 90m 2 / g of OSC material with BET surface area. Separately, using standard incipient wetness impregnation technique with water-soluble Pd salt impregnation with a diameter of about 150m 2 / g BET surface area, approximately 0.4cc / g pore volume and approximately The high specific surface area of ​​t...

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Abstract

An oxidation catalyst composite, methods and systems for the treatment of exhaust gas emissions from an advanced combustion engine, such as the oxidation of unburned hydrocarbons (HC), and carbon monoxide (CO) and the reduction of nitrogen oxides (NOx) from a diesel engine and an advanced combustion diesel engine are disclosed. More particularly, washcoat compositions are disclosed comprising at least two washcoat layers, a first washcoat comprising a palladium component and a second washcoat containing platinum and at least about 50% of the total platinum is located in the rear of the catalyst.

Description

[0001] Cross references to related applications [0002] According to 35 USC §119(e), the present invention claims the priority of U.S. Provisional Application No. 61 / 167,575, which is incorporated herein by reference. Technical field [0003] Embodiments of the present invention involve oxidation catalysts of zone design. More specifically, the embodiment relates to a partitioned catalyst formulation containing Pt and Pd in ​​a refractory metal oxide support (such as a Ce-containing support), and its use to reduce carbon monoxide and hydrocarbons in diesel engines and advanced combustion diesel engine systems. Background technique [0004] The operation of lean-burn engines (such as diesel engines and lean-burn gasoline engines) saves fuel for users, and because they operate at a high air / fuel ratio under lean fuel conditions, it is compared with spark-ignited stoichiometric gasoline engines. Compared with stoichiometric gasoline engine), it emits significantly less gaseous hydroc...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/42B01J37/025B01D53/94F01N3/10
CPCF01N3/035B01J35/0006B01D2258/012B01D2255/1023B01J23/63B01D53/9477F01N2510/0684B01D53/945B01J29/12F01N3/2066Y02T10/22B01D2255/9022B01J23/40B01J29/7415F01N3/103B01J37/0246B01D2255/1021B01J29/44F01N2510/0682B01J35/19B01J23/42B01J23/44B01J23/58Y02T10/12
Inventor J·B·霍克J·C·德特兰
Owner BASF CORP
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