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Catalyst composition for diesel particulate filter

A particulate filter and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, dispersed particle separation, etc., can solve the problems of increased nitrogen dioxide emissions and no development.

Inactive Publication Date: 2007-12-26
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, one problem during DPF regeneration is nitrogen dioxide (NO 2 ) increase in emissions
[0013] Although attempts have been made to suppress or reduce NO in diesel particulate filters 2 emissions (i.e., using reduction catalysts such as urea, fuel or hydrocarbons placed in the exhaust flow path), no reduction catalyst has been developed to reduce NO during regeneration 2 method of emission

Method used

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  • Catalyst composition for diesel particulate filter
  • Catalyst composition for diesel particulate filter
  • Catalyst composition for diesel particulate filter

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056] Preparation of Catalytic Diesel Particulate Filter

[0057] A number of diesel particulate filters using the catalyst composition of the present invention were prepared.

[0058] Sample Filter #32

[0059] A cordierite filter (mass m = 1048 g) was impregnated with a solution consisting of 250 ml of zirconium acetate, 30 ml of glycerin, 17 g of sucrose, 5 g of lanthanum acetate, and distilled water in a total volume of 550 ml to prepare lanthanum-stabilized zirconia (zirconia ) wash coat. The samples were then dried at 117°C and subsequently calcined at 750°C for three hours. The diesel particulate filter was then impregnated with a solution comprising dihydrogen hexachloroplatinate, copper nitrate, lanthanum nitrate, ferric nitrate, cobalt nitrate, and cerium nitrate. Pt loading is 1.76 g (corresponding to 20 g / ft3 concentration), CuO loading is 17.5 g, La 2 o 3 Load is 34.9 g, Fe 2 o 3 Load is 22.0 g, Co 3 o 4 The load is 12.4 g, while the CeO 2 The load ...

example 2

[0071] Sample filters prepared according to Example 1 were tested against a reference (commercial) sample, a non-catalyzed (uncoated) DPF sample, a fuel assisted DPF (ADPF). The tests were performed on an engine dynamometer connected to a 2.0 liter common rail (CR) diesel engine. Engine fitted with a commercial diesel oxidation catalyst (DOC) in a close-coupled position to determine NO produced during filter regeneration 2 amount.

[0072] Two different types of regeneration are applied: drop-to-idle regeneration (DTIR) and steady state regeneration (SSR). DTIR means that after the start of regeneration is determined by the reduction in back pressure, the engine is switched to idle, providing low flow through the filter and high oxygen concentration (resulting in the highest peak temperature during regeneration) to evaluate the worst case filter Regeneration, the situation that favors the highest peak temperature in the DPF. SSR means maintaining a steady state temperature ...

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Abstract

A catalyst composition is provided for use on a diesel particulate filter which facilitates the oxidation of soot from diesel engine exhaust and which generates low NO2 emissions during regeneration of the filter. The catalyst composition includes a catalytic metal comprising a platinum group metal selected from Pt, Pd, Pt-Pd, or combinations thereof, an active metal oxide component containing Cu and La; and an oxide component selected from oxides of Co, Fe, or combinations thereof. The catalyst composition includes a support selected from alumina, silica, zirconia, or combinations thereof. The catalyst composition may be provided on a diesel particulate filter by impregnating the filter with an alumina, silica or zirconia sol solution modified with glycerol and / or saccharose, impregnating the filter with a stabilizing solution, and impregnating the filter with a solution containing the catalyst metal precursor(s), the active metal oxide precursor(s) and the Co or Fe oxide(s). The resulting catalyst coated diesel particulate filter provides effective soot oxidation, exhibits good thermal stability, has a high BET surface area, exhibits minimal backpressure, and produces low NO2 emissions during filter regeneration.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of US Patent Application Serial No. 11 / 385,005, "Soot Oxidation Catalyst and Method of Making," filed March 20, 2006. The entire contents of this application are hereby incorporated by reference. technical field [0003] The present invention relates to catalyst compositions for diesel particulate filters. In particular, a system that aids in the oxidation of soot without producing increased NO during regeneration of particulate filters 2 Discharged catalyst composition. Background technique [0004] In recent years, environmental laws limiting diesel particulate emissions in the United States and Europe have necessitated improved removal of particulate matter from diesel engine emissions. Such particles usually consist of carbonized particles in the form of carbon black. Currently, the most common method of removing soot from engine emissions is the use of a diesel parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/94F01N3/20
CPCY02A50/20
Inventor 阿列克谢·A·杜布科夫艾伯特·N·希加波夫布兰登·帕特里克·卡伯里
Owner FORD GLOBAL TECH LLC
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