Catalytically coated particle filter and method for producing the same and its use

A particle filter and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, dispersed particle filtration, etc., can solve the problems of activity loss, palladium poisoning, low fresh activity, etc., and achieve the effect of good catalytic activity

Active Publication Date: 2007-09-26
UMICORE AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latter coatings are known for their excellent thermal stability, but have significantly lower fresh activity than coatings containing only platinum
Another disadvantage of catalytic coatings containing platinum and palladium is their high sensitivity to sulfur, which has hitherto prevented their use in diesel engines for passenger cars
Palladium can be poisoned even when exposed to sulfur dioxide-containing diesel exhaust for a relatively short period of time, causing a corresponding loss of activity

Method used

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  • Catalytically coated particle filter and method for producing the same and its use
  • Catalytically coated particle filter and method for producing the same and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: (filter E1)

[0043] To prepare a filter according to the present invention, first, a third filter substrate was uniformly coated with a platinum catalyst over its entire length in the same manner as in Comparative Example 1. However, the platinum loading was reduced to 3.1 g / l (88 g / ft 3 )s level. Then, in order to form the first catalyst, palladium nitrate is further used to impregnate the length of 25.4 mm which will be the end of the gas inlet side of the filter to have 0.42 g / l (12 g / ft 3 ) palladium content. Therefore, the total precious metal content of the filter is also 3.18g / l (90g / ft 3 ). The first catalyst formed by further impregnation has 3.53 g / l (100 g / ft 3 ) of the noble metal concentration, the palladium / platinum ratio is 1:7.3. In this case, the second catalyst was formed from a platinum catalyst that was not further impregnated with palladium. Therefore, its palladium / platinum ratio is 0.

[0044] The light-off temp...

Embodiment 2

[0053] Example 2: (filter E2)

[0054] First, the filter substrate was uniformly coated with the platinum catalyst of Comparative Example 1 so that the platinum concentration was 3.1 g / l (88 g / ft 3 ). Then, further use palladium nitrate to impregnate the length of 25.4 mm at one end of the inlet side of the filter so as to have 0.42 g / l (12 g / ft 3 ) palladium content. Therefore, the total precious metal loading is also 3.18g / l (90g / ft 3 ). The first catalyst formed by further impregnation has 3.53 g / l (100 g / ft 3 ) of the noble metal concentration, the palladium / platinum ratio is 1:7.3.

[0055] The catalytic activity of these filters was tested in the fresh state and after hydrothermal aging on a Euro III certified diesel passenger car with a 100 kW 2.21 common rail diesel engine. This vehicle has a factory installed oxidation catalyst and particulate filter. Instead of the light-off temperature, the vehicle is measured for emissions during the NEDC d...

Embodiment 3

[0058] A second set of filters C3, C4 and E2 was prepared.

[0059] The light-off temperature of the filter without precatalyst was first measured in the fresh state with a direct injection diesel engine (2.2 l capacity) with exhaust gas turbocharging and charge cooling and a power of 100 kW. All filters were then exposed to sulfur for 6 hours at exhaust gas temperatures between 200° C. and 300° C. using diesel fuel containing 2400 ppm (by mass) sulfur in each case, and then measured again. The results are collected in Table 3.

[0060] filter

[0061] Clearly, the filter with a Pt-only coating has a similar fresh activity to the filter according to the invention which has been further impregnated with palladium on the inflow side. Filter C2 with a uniform Pd / Pt coating over the length of the filter is very sensitive to sulfur poisoning. The reason is that sulfur easily poisons palladium. This problem is substantially avoided if palladium is introduced according ...

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Abstract

The invention relates to a catalytically coated particle filter which comprises two catalysts arranged one after the other. The first catalyst is located in the gas inlet zone of the filter and contains a palladium / platinum catalyst. The second catalyst is located behind it and preferably contains only platinum as the catalytically active component. The combination of these two catalysts imparts good resistance to aging and sulfur poisoning to the coated filter.

Description

technical field [0001] The present invention relates to a catalyst-coated particulate filter, a method for its preparation, and its use for the removal of carbon monoxide, hydrocarbons and soot particles from the exhaust gas of an internal combustion engine, in particular a lean burn gasoline or diesel engine. Background technique [0002] A particulate filter is able to filter out soot particles from the lean-burn exhaust gas of an internal combustion engine and thus prevent the particles from being emitted into the atmosphere. A variety of filters can be used for this purpose, such as filters called wall flow filters, ceramic fibers or foams, and filters formed from steel mesh, which allow separations of 95% and above . However, the actual difficulty is not filtering out the soot particles, but regenerating the filter used. Carbon ash only burns at a temperature of about 600°C. However, these temperatures are generally only reached in the full load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D46/24F01N3/035B01J35/00
CPCB01J23/40F01N3/035B01D46/0001B01J23/42B01D2255/1021B01D46/24B01D53/945B01D2255/1023B01J35/0006B01J37/0248B01J37/0242Y02T10/22B01J23/44B01D2258/012Y02T10/12B01D39/00
Inventor 马库斯·普法伊费尔马库斯·克格尔罗格·施塔布帕斯卡尔·阿道夫伊冯娜·德梅尔托比亚斯·库尔埃格伯特·罗克斯托马斯·克罗伊策弗兰克-瓦尔特·许策
Owner UMICORE AG & CO KG
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