Catalytically coated diesel particle filter, process for producing it and its use

A particulate filter and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of hindering exhaust gas catalytic converters, low tolerance, and decreased catalytic activity.

Active Publication Date: 2009-08-26
UMICORE AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The significantly lower resistance of Pt / Pd coatings to sulfur poisoning and the associated reduction in catalytic activity has long prevented the use of palladium in exhaust gas catalytic converters for diesel passenger cars

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] The present invention will now be described with reference to the following examples and figures. A number of DPFs with different coatings were prepared and their cleaning performance in the NEDC European test cycle was tested in engine test rigs and test vehicles. In fresh state and damp heat aging (atmosphere containing 10% H 2 O, 10% O 2 , margin N 2 , in a chamber oven at 750° C. for 16 hours) to analyze the filter.

[0031] The substrate used in each case was a filter comprising silicon carbide with a cell density (Zelldichte) of 46.5 cm -1 (300cpsi) and the channel wall thickness is 0.3mm (12mil). The porosity of the filter material used was 60%; the average pore size was 20 μm. The length of the filter body is 152.4mm.

[0032] Back pressure measurement:

[0033] To analyze the effect of loading zeolite on the particulate filter, at 150 and 300 m 3 The back pressures of three particulate filters loaded with different carrier oxides and zeolites were meas...

Embodiment 1

[0038] Example 1 (filter F1):

[0039] A second filter substrate is coated with the catalyst of the present invention. First use 60g / ft over the entire length of the filter 3 The precious metal load evenly coats the filter. However, unlike the comparative example, the coating of the present invention comprises, in addition to gamma-alumina stabilized with a Pt / Pd ratio of 2:1, a zeolite mixture including Y-type zeolite and beta zeolite (mixing ratio 1 : 1). Both zeolites were doped with a small amount of Pt (0.5% by weight) by impregnation method before being added to the coating suspension. The ratio of gamma alumina to zeolite mixture is about 1:1. Thereafter, in a further coating step, the inlet side of the filter (over a length of 76.2 mm) was coated with an additional 2.12 g / l of noble metal using the same coating suspension. Therefore, the total concentration of precious metals Pt and Pd on filter F1 is 3.18g / l (90g / ft 3 ), the Pt / Pd ratio is 2:1.

[0040] The c...

Embodiment 2

[0042] Example 2 (filters F2 and F3):

[0043] Similar to Example 1 (filter F1 ), the other two filter substrates were coated with a noble metal loading of 3.18 g / l. Unlike filter F1 , in filter F2 zeolite is applied only in the first catalyst layer in an amount of 20 g / l over the entire length of the filter. In filter F3, only the zeolite is applied in the second catalyst layer. For example, in Example 1, the zeolite used was a mixture of Y-type zeolite and Beta zeolite (mixing ratio 1:1). The two zeolites used have each been doped with 0.5% by weight of Pt.

[0044] The catalytic activity of the filters F2 and F3 was also tested in the fresh state and after aging in a damp heat oven in a EURO IV standard passenger car with a 103 kW 2.0 l diesel engine with pump-nozzle injection system. The results are also summarized in Table 1.

[0045] Filters F2 and F3 were also found to have improved emission performance for hydrocarbons and CO emissions emitted in NEDC, especially...

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Abstract

A diesel particle filter having an oxidation catalyst comprising platinum and palladium deposited thereon is described. The conversion of hydrocarbons and carbon monoxide can be significantly improved by mixing zeolites as HC storage components into the oxidation catalyst. Furthermore, the particle filter is coated with a second catalyst which does not contain any zeolites from the inlet end to part of the length.

Description

technical field [0001] The present invention relates to a catalyst-coated diesel particulate filter for cleaning diesel engine exhaust gases, a method of coating the filter and use thereof. Background technique [0002] A particulate filter removes particulate exhaust gas components, in particular soot particles (Ruβpartikel), from the exhaust gas of an internal combustion engine and thus prevents them from being released into the atmosphere. In principle, surface filters or depth filters (Tiefenfilters) can be used for this purpose. Surface filters are usually composed of ceramic substances such as silicon carbide, cordierite, aluminum titanate or mullite. These filters achieve a filtration level greater than 95%. For surface filters, an open structure for the deposition of soot particles can also be used as an option. These open structures are mainly ceramic foams or filters containing metal wire fabrics. The filtration efficiency of these open filter systems is much l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J29/70B01D53/94B01J37/02B01J23/44F01N3/022B01J29/08F01N3/28B01J29/18
CPCF01N2510/0682F01N3/0821F01N3/035B01D53/944B01J35/0006F01N2510/063B01D2255/9155B01J29/7415B01D2255/912F01N3/0835B01J37/0246F01N3/0222B01D2255/206B01D2255/50F01N2370/02B01J29/80B01D2255/102B01J37/0244Y10S502/514B01J37/0248B01D2255/20738B01J29/126B01D2255/20761B01J23/44F01N2370/04Y02A50/20B01D53/94B01J23/42B01J29/18F01N3/022
Inventor M·克格尔M·普法伊菲尔G·耶斯克F-W·许策S·弗朗茨T·克罗伊策
Owner UMICORE AG & CO KG
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