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
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.
대표청구항▼
What is claimed is: 1. A catalyst composition for facilitating soot oxidation comprising: a catalytic metal selected from the group consisting of Pt, Pd, Pt—Pd, Ag, and combinations thereof and an active metal oxide component comprising CuO—La2CuO4. 2. The catalyst composition of c
What is claimed is: 1. A catalyst composition for facilitating soot oxidation comprising: a catalytic metal selected from the group consisting of Pt, Pd, Pt—Pd, Ag, and combinations thereof and an active metal oxide component comprising CuO—La2CuO4. 2. The catalyst composition of claim 1, wherein said catalytic metal comprises a platinum group metal and the platinum group metal loading in said composition is less than about 20 g/ft3. 3. The catalyst composition of claim 2 wherein said platinum group metal loading is about 15 g/ft3. 4. The catalyst composition of claim 1 further including a support selected from the group consisting of alumina, silica, zirconia, and combinations thereof. 5. The catalyst composition of claim 4 wherein said support has been stabilized with lanthanum, zirconium, aluminum, or combinations thereof. 6. A diesel exhaust gas treatment system comprising: a diesel particulate filter for receiving diesel exhaust gas from a diesel engine; and a catalyst composition coated on said filter for facilitating the oxidation of soot trapped on said filter; said catalyst composition comprising a catalytic metal selected from the group consisting of Pt, Pd, Pt—Pd, Ag, and combinations thereof and an active metal oxide comprising CuO—La2CuO4. 7. The diesel exhaust treatment system of claim 6 wherein said catalytic metal comprises a platinum group metal and the platinum group metal loading in said catalyst composition is less than about 20 g/ft3. 8. The diesel exhaust treatment system of claim 7 wherein said platinum group metal loading is about 15 g/ft3. 9. The diesel exhaust treatment system of claim 6 wherein said catalyst composition further includes a support selected from alumina, silica and zirconia, or combinations thereof. 10. The diesel exhaust treatment system of claim 6 wherein said catalyst composition facilitates oxidation of soot trapped on said filter at a temperature between about 550 and 600° C. 11. The diesel exhaust treatment system of claim 10 wherein said catalyst composition facilitates oxidation of 60 to 100% of soot trapped on said filter. 12. The diesel exhaust treatment system of claim 9 wherein said support has been stabilized with lanthanum, zirconium, aluminum, or combinations thereof. 13. The diesel exhaust treatment system of claim 6 further including a diesel oxidation catalyst positioned upstream from said diesel particulate filter.
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이 특허에 인용된 특허 (14)
Domesle Rainer (Maintal DEX) Engler Bernd (Hanau DEX) Koberstein Edgar (Alzenau DEX) Vlker Herbert (Hanau DEX), Apparatus for the purification of exhaust gas from diesel motors.
Seong, Hee Je; Choi, Seungmok, Catalytic nanosheets to lower soot light off temperatures, method for making nanosheets to lower soot light off temperatures.
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