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Washcoated particulate filter substrate

A filter and substrate technology, applied in the direction of dispersed particle filtration, coating, filtration separation, etc., can solve the problems of increasing system back pressure, and achieve the effects of avoiding back pressure problems, reducing pore clogging, and increasing selectivity

Inactive Publication Date: 2012-12-26
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this thicker coating would undesirably increase the backpressure in the system, as in EP 1379322

Method used

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  • Washcoated particulate filter substrate
  • Washcoated particulate filter substrate
  • Washcoated particulate filter substrate

Examples

Experimental program
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Embodiment Construction

[0020] In one embodiment, approximately the entire length L of the substrate is coated with a coating comprising a relatively high density material.

[0021] For an example of the temperature gradients that may be reached during active regeneration, refer to the attached figure 1 , which shows the appearance from a computer model of active CSF regeneration over a period of low exhaust gas flow. It can be seen that the rear of the filter towards the bottom of the figure reaches very high temperatures and the area containing the rear of the filter would be well suited to have higher heat provided by the coating of the invention.

[0022] Thus, in one embodiment, an area up to 2 / 3 of the total length L of the substrate from the first end of the substrate is coated substantially over the entire length with a coating comprising a relatively high density material. In this particular embodiment, an area of ​​at least 1 / 3, for example up to 2 / 3, of the total length L of the substrate...

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Abstract

A particulate filter substrate for an internal combustion engine at least partially coated with a coating comprising a relatively high density material having a density of at least 3.50 gcm-3.

Description

technical field [0001] The present invention relates to a particulate filter substrate for an internal combustion engine, such as a diesel engine, in particular a coated particulate filter substrate. Background technique [0002] Emissions from internal combustion engines, including diesel engines, are restricted by legislation by governments around the world. Original Equipment Manufacturers (OEMs) seek to meet legal requirements by combining engine design and exhaust aftertreatment. Exhaust gas systems for exhaust gas aftertreatment usually include a series of catalysts and / or filters designed to perform certain reactions to reduce the proportion of exhaust gas species restricted by law. Exhaust gas types restricted by law include nitrogen oxides (NO x ), carbon monoxide (CO), hydrocarbons (HC) and particulate matter (PM). [0003] One exhaust system component used to treat these exhaust species is the particulate filter substrate. Typically, the PM trapped in the filt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/24B01D53/94F01N3/023B01D39/20
CPCB01D2239/0471B01J21/066B01J23/42B01D53/944B01J37/0242B01D46/24B01D39/20B01D53/94F01N3/023
Inventor A·F·基菲P·R·菲利普斯
Owner JOHNSON MATTHEY PLC