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Improved catalyzed soot filter

A filter and soot technology, applied in dispersed particle filtration, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of system volume increase limitation, cost increase, and the need for reducing agents, etc.

Active Publication Date: 2012-11-14
BASF AG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Indeed, although separation of the SCR catalyst from the catalyzed soot filter may be advantageous in particular to reduce individual components in the exhaust system, the increased cost, need for reductant, and increased volume of the system limit its applicability
On the other hand, when integrating an SCR catalyst into a catalyzed soot filter, although the system volume is reduced, there is an increased risk of unacceptably high back pressure in the exhaust line and the need to inject reductant into the system is still

Method used

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  • Improved catalyzed soot filter
  • Improved catalyzed soot filter
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Examples

Experimental program
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Effect test

Embodiment

[0101] 1. Catalyst Preparation

[0102] 1.1 Zoned Catalytic Soot Filter with Pd-Rear Outlet Coating - 50% Length (Sample A)

[0103] For inlet coating, use to provide 13g / ft 3 The final dry Pd content of palladium nitrate aqueous impregnated 0.25g / in 3 The gamma-alumina is then impregnated with a platinum solution of a Pt complex in which platinum is stabilized as an ammine to provide 27 g / ft 3 of dry Pt content. The resulting powder was dispersed in water. The resulting slurry was then used to coat a cordierite filter substrate from the inlet side of the filter to 50% of the full length of the filter. After drying at 110°C in air and calcination in air at 450°C, the amount of washcoat on 50% of the inlet to the filter substrate was approximately 0.27g / in 3 .

[0104] For outlet coating, use to provide 5g / ft 3 The final dry Pd content of palladium nitrate aqueous impregnated 0.25g / in 3 gamma-alumina. The resulting powder was dispersed in water. The resulting slurry w...

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Abstract

A catalyzed soot filter is provided wherein its inlet coating comprises an oxidation catalyst comprising platinum (Pt) and optionally palladium (Pd), and its outlet coating comprises an oxidation catalyst comprising Pd and optionally Pt. The Pt concentration in the outlet coating is lower than that in the inlet coating. The weight ratio of Pt:Pd in the outlet coating is in the range of 0:1-2:1. The inlet coating and the outlet coating are present on the wall flow substrate at a coating loading ratio in the range of 0.5-1.5, calculated as ratio of the loading of the inlet coating (in g / inch3(g / (2.54cm)3)):loading of the outlet coating (in g / inch3(g / (2.54cm)3)).

Description

technical field [0001] The present invention relates to a catalyzed soot filter, in particular for the treatment of diesel engine exhaust, which has the properties of ensuring soot particulate filtration, promoting carbon monoxide oxidation and producing low NO during normal engine operation and active regeneration conditions 2 Zoning design of emissions. Background technique [0002] Diesel engine exhaust is a heterogeneous mixture containing not only gaseous emissions such as carbon monoxide ("CO"), unburned hydrocarbons ("HC") and nitrogen oxides ("NOx"), but also Condensed phase materials, i.e. liquids and solids. Emission treatment systems for diesel engines must treat all exhaust components to meet emission standards set by various regulatory agencies around the world. [0003] Total particulate matter emissions from diesel engine exhaust contain three main components. One component is the solid, dry, solid carbonaceous or soot fraction. This dry carbonaceous fract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/00
CPCB01D53/944F01N2510/0682B01J23/44B01D53/9468B01J23/42B01J35/0006B01D2255/1023B01D2255/9155F01N13/0093B01J37/0244F01N3/035B01J37/0248B01D2255/1021B01D2258/012F01N3/103F01N13/0097Y10S502/52712Y10S502/52713Y10S502/52718Y10S502/52719B01J35/19F01N2250/12
Inventor A·H·彭克G·格鲁贝特Y·李R·沃尔夫S·罗斯T·穆勒-斯塔奇K·福斯A·斯阿尼T·纽鲍尔
Owner BASF AG
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