Soot oxidation catalyst and method of making
First Claim
1. A catalyst composition for facilitating soot oxidation comprising:
- a catalytic metal selected from Pt, Pd, Pt—
Pd, Ag, or combinations thereof and an active metal oxide component containing Cu and La;
wherein when said catalytic metal comprises a platinum group metal, the platinum group metal loading in said composition is less than about 20 g/ft3.
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Accused Products
Abstract
A catalyst composition for facilitating the oxidation of soot from diesel engine exhaust is provided. The catalyst composition includes a catalytic metal selected from Pt, Pd, Pt—Pd, Ag, or combinations thereof, an active metal oxide component containing Cu and La, and a support selected from alumina, silica, zirconia, or combinations thereof. The platinum group metal loading of the composition is less than about 20 g/ft3. The catalyst composition may be provided on a diesel particulate filter by impregnating the filter with an alumina, silica or zirconia sol solution modified with glycerol and/or saccharose, impregnating the filter with a stabilizing solution, and impregnating the filter with a solution containing the active metal oxide precursor(s) and the catalytic metal precursor(s). The resulting catalyst coated diesel particulate filter provides effective soot oxidation, exhibits good thermal stability, has a high BET surface area, and exhibits minimal backpressure.
28 Citations
20 Claims
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1. A catalyst composition for facilitating soot oxidation comprising:
a catalytic metal selected from Pt, Pd, Pt—
Pd, Ag, or combinations thereof and an active metal oxide component containing Cu and La;
wherein when said catalytic metal comprises a platinum group metal, the platinum group metal loading in said composition is less than about 20 g/ft3.- View Dependent Claims (2, 3, 4, 5)
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6. A method of providing a catalyst composition on a diesel particulate filter comprising:
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providing a diesel particulate filter;
impregnating said filter with a colloidal solution selected from alumina sol, silica sol, zirconium sol, or combinations thereof;
impregnating said filter with a stabilizing solution;
and impregnating said filter with a solution containing a metal oxide precursor selected from copper nitrate, lanthanum nitrate, and mixtures thereof, and a catalytic metal precursor selected from silver nitrate, palladium nitrate, dihydrogen hexachloroplatinate, and combinations thereof. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A diesel exhaust gas treatment system comprising:
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a diesel particulate filter for receiving diesel exhaust gas from a diesel engine; and
a catalyst composition coated on said filter;
said catalyst composition comprising a catalytic metal selected from Pt, Pd, Pt—
Pd, Ag, or combinations thereof and an active metal oxide containing Cu and La;
wherein when said catalytic metal comprises a platinum group metal, the platinum group metal loading in said catalyst composition is less than about 20 g/ft3. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification