Coated diesel particle filter

Patent metadata

Field	Value
Publication number	US-9346019-B2
Application number	US-201313864669-A
Country	US
Kind code	B2
Filing date	Apr 17, 2013
Priority date	Apr 20, 2012
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

The present invention relates to a diesel particle filter which has a coating active in oxidation catalysis and which is characterized in that said diesel particle filter comprises a material zone which removes platinum traces contained in the exhaust-gas flow, and to the use of said diesel particle filter in the purification of exhaust gases of diesel engines.

First claim

The invention claimed is:

1. A diesel particle filter which has a coating active in oxidation catalysis and wherein said diesel particle filter comprises a material zone which removes platinum traces contained in an exhaust-gas flow.

2. The diesel particle filter as claimed in claim 1 , wherein said diesel particle filter is a wall-flow filter substrate comprised of cordierite, silicon carbide, mullite or aluminum titanate.

3. The diesel particle filter as claimed in claim 1 , wherein the coating active in oxidation catalysis comprises one or more platinum group elements.

4. The diesel particle filter as claimed in claim 1 , wherein the material zone which removes platinum traces contained in the exhaust-gas flow is present in the form of an additional layer on the coating active in oxidation catalysis and completely covers said coating at an exhaust-gas side.

5. The diesel particle filter as claimed in claim 1 , wherein the material zone which removes platinum traces contained in the exhaust-gas flow is present in the form of an additional layer on the coating active in oxidation catalysis and only partially covers said coating at an exhaust-gas side.

6. The diesel particle filter as claimed in claim 1 , further comprising a filter substrate, and wherein the coating active in oxidation catalysis and the material zone which removes the platinum traces contained in the exhaust-gas flow are present in separate zones on the filter substrate.

7. The diesel particle filter as claimed in claim 5 , wherein the material zone which removes the platinum traces contained in the exhaust-gas flow occupies 10 to 60% of the total length of the filter substrate, but at least 2.5 cm (approximately 1 inch).

8. The diesel particle filter as claimed in claim 5 , wherein the material zone which removes the platinum traces contained in the exhaust-gas flow is arranged at an outflow side of the filter.

9. The diesel particle filter as claimed in claim 1 , wherein the material zone which removes platinum traces contained in the exhaust-gas flow comprises palladium, gold or mixtures thereof as an active constituent.

10. The diesel particle filter as claimed in claim 9 , wherein palladium, gold or mixtures thereof are present in amounts of 0.02 to 0.21 g/l (0.5 to 6 g/ft 3 ) in relation to the filter volume occupied by the material zone.

11. The diesel particle filter as claimed in claim 9 , wherein palladium, gold or mixtures thereof are present in amounts of 0.04 to 0.11 g/l (1 to 3 g/ft 3 ) in relation to the filter volume occupied by the material zone.

12. The diesel particle filter as claimed in claim 9 , wherein palladium, gold or mixtures thereof are present on an inert carrier oxide with a large surface area.

13. The diesel particle filter as claimed in claim 12 , wherein the inert carrier oxide is aluminum oxide, doped aluminum oxide, titanium dioxide, cerium oxide, zirconium oxide, cerium/zirconium mixed oxide, silicon dioxide or a mixture of two or more of the stated oxides.

14. A method of manufacturing an exhaust-gas treatment system for preventing the contamination with platinum of a selective catalytic reduction (SCR) catalytic converter in the exhaust-gas treatment system which comprises arranging, as viewed in the flow direction of the exhaust gas, an oxidation catalytic converter comprising platinum, the diesel particle filter of claim 1 and an SCR catalytic converter.

15. An exhaust-gas treatment system for the purification of exhaust gases of a diesel engine, which exhaust-gas treatment system comprises, as viewed in the flow direction of the exhaust gas, an oxidation catalytic converter comprising platinum, the diesel particle filter of claim 1 and an SCR catalytic converter.

16. A diesel particle filter which has a coating active in oxidation catalysis and wherein said diesel particle filter comprises a material zone which removes platinum traces contained in an exhaust-gas flow, wherein the material zone comprises palladium as an active constituent.

17. The diesel particle filter of claim 16 , wherein the material zone consists of only palladium as the active constituent.

18. The diesel particle filter of claim 16 , wherein the palladium is present in an amount of about 0.04 to 0.11 g/l (1 to 3 g/ft3) in relation to the filter volume occupied by the material zone.

19. The diesel particle filter of claim 16 , wherein the material zone occupies at least 1.5 inches of the total length of the filter substrate.

20. The diesel particle filter of claim 16 , wherein the material zone is arranged at an outflow side of the filter.

21. An exhaust-gas treatment system for the purification of exhaust gases of a diesel engine, which exhaust-gas treatment system comprises, as viewed in the flow direction of the exhaust gas, an oxidation catalytic converter comprising platinum, the diesel particle filter of claim 16 , and an SCR catalytic converter.

22. A method of assembling a catalytic system, comprising: assembling together, as viewed in the flow direction of the exhaust gas, an oxidation catalytic converter comprising platinum, the diesel particle filter of claim 16 , and an SCR catalytic converter.

Assignees

• Umicore Ag & Co Kg

Inventors

• Pfeifer Marcus
• Schiffer Michael
• Dornhaus Franz
• Basso Stephan
• Schuetze Frank-Walter

Classifications

• F01N3/0222

  the structure being monolithic, e.g. honeycombs · CPC title

• B01D2255/1023

  Palladium · CPC title

• F01N2510/0682

  having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa · CPC title

• F01N2510/0684

  having more than one coating layer, e.g. multi-layered coatings · CPC title

• Y10T29/49826

  Assembling or joining · CPC title