Method for coating a wall-flow filter
AssigneeUmicore AG & Co. KG
InventorsMartin FOERSTER, Antje OLTERSDORF, Naina DEIBEL, Sascha ZOELLE, Jürgen KOCH, Manuel GENSCH, Wolfgang HASSELMANN
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Abstract
The present invention relates to a method for producing a coated wall-flow filter. The wall-flow filter is coated with a powder aerosol.
Claims23
Method for producing a wall-flow filter for reducing the harmful substances in the exhaust gas of an internal combustion engine, wherein a dry filter is selectively impinged on its inlet surface with a dry powder/gas aerosol which has at least one high-melting compound, such that the powder precipitates in the pores of the filter walls, wherein the powder is dispersed in the gas, then guided into a gas stream, and drawn into the inlet side of the filter without further supply of a gas, and wherein the filter was catalytically coated prior to impingement with the powder/gas aerosol.
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Device for producing a wall-flow filter for reducing the pollutants in the exhaust gas of an internal combustion engine,
- characterized in that said device has
- a unit for dispersing powder in a gas;
- a unit for mixing the dispersion with an existing gas stream;
- a filter-receiving unit designed to allow the gas stream to flow through the filter without further supply of a gas;
- a suction-generating unit that maintains the gas stream through the filter;
- and
- optionally, a unit for generating vortices upstream of the filter so that a deposition of powder on the inlet plugs of the filter is prevented as much as possible.
A method for producing a wall-flow filter for reducing the harmful substances in the exhaust gas of an internal combustion engine, comprising:
- catalytically coating a wall-flow filter;
- drying the catalytically coated dry filter;
- impinging the dry filter on an inlet surface with a dry powder/gas aerosol which has at least one high-melting compound, such that the powder precipitates in the pores of the filter walls, wherein the powder is dispersed in the gas, then guided into a gas stream, and drawn into the inlet side of the filter without further supply of a gas.
Dependencies are inferred from the claim text.