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Small engine layered catalyst article and method of making

A technology of catalysts and products, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as poor ability and poor toxicity resistance

Inactive Publication Date: 2016-08-10
BASF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite its price and availability advantages, palladium is only in use as a catalytic material, and there are several problems
Palladium is less resistant to toxicity from fuel and oil contaminants than platinum, and less effective than platinum at converting short-chain saturated hydrocarbons such as ethane and propane

Method used

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  • Small engine layered catalyst article and method of making

Examples

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preparation example Construction

[0052] The preparation of the second catalytic layer can be deposited on the first layer in the same manner as described above for the deposition of the first catalytic layer, using OSC as a support for rhodium and optionally platinum components . An alumina support can also be included in the second catalytic layer, but is not required.

[0053] Before several exemplary embodiments of the invention are described, it is to be understood that the invention is not limited to the details of construction and process steps set forth in the following description. The invention is capable of other embodiments and of being carried out in various ways.

[0054] The following non-limiting examples are intended to illustrate various embodiments of the invention. In each example, the support is cordierite.

Embodiment

[0056] 1. Forming the first catalytic layer

[0057] A portion of the solution of the palladium component and a portion of the solution of the platinum component are mixed with high surface area lanthanum-alumina, and water to form a wet powder and achieve incipient wetness impregnation. Separately, a further part of the solution of the palladium component and a further part of the solution of the platinum component are mixed with refractory lanthanum oxide-alumina, and water to form a wet powder and achieve incipient wetness impregnation. Ceria-zirconia, octanol, acetic acid and zirconium acetate were added and mixed with the Pd / Pt+ support mixture in a planetary mixer (P-mixer). The wet powder preparation was crushed to a particle size of 90% = 5-15 μm. The slurry is coated onto the monolithic support using deposition methods known in the art for depositing catalysts on substrates. After coating, the support with the primer layer and the first catalytic layer was dried and...

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Abstract

Catalyst articles comprising substantially only a palladium precious metal component in a first catalytic layer and a rhodium component in a second catalytic layer and related methods of preparation and use are disclosed. Also disclosed is a catalyst article comprising a first layer formed on a carrier substrate, wherein the first layer comprises a refractory metal oxide and has a surface that is substantially uniform; a second layer formed on the first layer, wherein the second layer comprises i) an oxygen storage component that is about 50-90% by weight of the second layer and ii) a palladium component in an amount of about 2-5% by weight of the second layer, wherein the palladium component is substantially the only platinum group metal component, and a palladium-free third layer comprising a rhodium component supported on a thermostable oxygen storage component which is about 80-99% by weight of the second layer. One or more improved properties are exhibited by the catalyst article.

Description

[0001] This application is a divisional application of the patent application with application number 201080060878.4. The filing date of the original application is November 02, 2010. The title of the invention is "small engine layered catalyst product and preparation method". [0002] Cross References to Related Applications [0003] This application claims priority benefit to US Provisional Application Serial No. 61 / 258,783, filed November 6, 2009, based on 35 U.S.C. § 119(e), and is incorporated herein by reference. technical field [0004] The present invention relates to catalytic articles for effective treatment of gas streams containing hydrocarbons, carbon monoxide and nitrogen oxides, methods of using catalytic articles to treat said gas streams, systems comprising catalytic articles, and methods of making said catalytic articles. More particularly, the invention provides catalyst articles and methods of treating exhaust gases produced by small engines. Background t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/025B01D53/94B01D53/72B01D53/62B01D53/56B01J35/00
CPCB01D53/945B01J23/63B01J37/0201B01J37/0244B01D2255/9022B01D2258/012B01D2255/1023B01D2255/1025B01D2255/2065B01D2255/2066B01D2255/2068B01D2255/908B01J21/066B01J37/0219B01J37/0248B01J37/04Y10S502/52712Y10S502/52713Y02T10/12
Inventor P·H·德兰M·P·加利甘K·阿利韦Y·刘
Owner BASF CORP
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