Method for producing gasoline particulate filter
AssigneeJohnson Matthey (Shanghai) Chemicals Limited
InventorsWenjie Dong, Hongyu Ji, Dongsheng Qiao, Zhou Shang, Guangyong Xiong
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Abstract
A method for the manufacture of a Gasoline Particulate Filter is disclosed. The method comprises forming a washcoat slurry, coating a wall-flow filter substrate with the washcoat slurry to form a washcoated substrate, and calcining the washcoated substrate to form a Gasoline Particulate Filter. The washcoat slurry comprises a platinum group metal component consisting of Pt and Rh, an oxygen storage capacity material, and a carboxylate ion.
Claims19
A method for the manufacture of a Gasoline Particulate Filter (GPF), the method comprising:
- (i) forming a washcoat slurry;
- (ii) coating a wall-flow filter substrate with the washcoat slurry to form a washcoated substrate;
- and
- (iii) calcining the washcoated substrate to form the GPF,
- wherein the washcoat slurry comprises
- (a) a platinum group metal (PGM) component consisting of Pt and Rh;
- (b) an oxygen storage capacity (OSC) material that is ceria or a mixed oxide comprising ceria;
- and
- (c) a carboxylate ion.
A pre-calcined Gasoline Particulate Filter precursor comprising a washcoated wall-flow filter substrate that comprises a washcoat, wherein the washcoat comprises:
- (a) a platinum group metal (PGM) component consisting of Pt and Rh;
- (b) an oxygen storage capacity (OSC) material that is ceria or a mixed oxide comprising ceria;
- and
- (c) a carboxylate ion.
Dependencies are inferred from the claim text.