Method for the preparation of a catalysed particulate filter and catalysed particulate filter
AssigneeHaldor Topsoe A/S
InventorKeld Johansen
Life of this patent
Estimating the term…
Abstract
Method for the preparation of a catalysed particulate filter and a particulate filter. The method comprises the steps of a) providing a catalyst wash coat with a first catalyst active in burning off of soot and a second catalyst active in selective catalytic reduction of nitrogen oxides; b) coating a particulate filter body with the catalyst wash coat on the dispersion side and the permeate side of the filter body and within partition walls of the filter body; and c) drying and heat treating the coated filter body to obtain the catalysed particulate filter.
Claims12
Method for the preparation of a catalysed particulate filter comprising the steps of
- a) providing a single catalyst wash coat obtained from a wash coat suspension containing a first catalyst active in burning off of soot in combination with a second catalyst active in selective catalytic reduction of nitrogen oxides;
- b) coating a particulate filter body with the catalyst wash coat on the dispersion side and the permeate side of the filter body and within partition walls of the filter body;
- and
- c) drying and heat treating the coated filter body to obtain the catalysed particulate filter, wherein the first or the second catalyst in the wash coat suspension has a particle size being equal to or larger than the mean pore size of the filter walls.
A catalysed particulate filter coated with a wash coat on its dispersion side and its permeate side and within partition walls of the filter, said wash coat obtained from a wash coat suspension containing a first catalyst being active in burning off of soot together with a second catalyst active in a selective catalytic reduction of nitrogen oxides, wherein the first or the second catalyst in the wash coat suspension has a particle size being equal to or larger than the mean pore size of the filter walls.
Dependencies are inferred from the claim text.