Apparatus for removing soot from diesel engine exhaust streams at temperatures at or below 150° C.
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/56
B01J-023/34
B01J-023/745
F01N-003/24
F01N-003/035
B01D-053/86
B01D-053/94
출원번호
US-0367872
(2009-02-09)
등록번호
US-8097554
(2012-01-17)
발명자
/ 주소
Roberts, Thomas Richard
Fronheiser, Dennis Roland
Iacubucci, Thomas A.
출원인 / 주소
AirFlow Catalyst Systems, Inc.
대리인 / 주소
Harris Beach PLLC
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
An apparatus for removing soot from diesel engine exhaust streams at temperatures below 150° C. is provided. Although the use of particulate filters for removing carbonaceous soot from such exhaust streams is known, such systems are either active or operate under high temperatures, i.e. in excess of
An apparatus for removing soot from diesel engine exhaust streams at temperatures below 150° C. is provided. Although the use of particulate filters for removing carbonaceous soot from such exhaust streams is known, such systems are either active or operate under high temperatures, i.e. in excess of 300° C. The claimed apparatus includes a flow through support device composed of ceramic, such as cordierite or silicon carbide, or a primarily nonferrous metal or stainless steel and coated with an oxide formation comprising hematite and bixbyite in a ratio from 1:1 to 9:1. The claimed apparatus can also include a diesel particulate filter coated with a coating comprising tin, aluminum and zirconium oxides prepared by a co-precipitation process and thereafter coated with platinum or other precious metal.
대표청구항▼
1. A coating for a substrate, comprising: hematite (Fe2O3) and bixbyite ((Mn1.5,Fe0.5)O3) wherein the ratio of hematite to bixbyite ranges from 1:1 to 9:1. 2. A coating according to claim 1 wherein said hematite and bixbyite are applied as a solution comprising a ferric salt and a manganese salt. 3.
1. A coating for a substrate, comprising: hematite (Fe2O3) and bixbyite ((Mn1.5,Fe0.5)O3) wherein the ratio of hematite to bixbyite ranges from 1:1 to 9:1. 2. A coating according to claim 1 wherein said hematite and bixbyite are applied as a solution comprising a ferric salt and a manganese salt. 3. A coating according to claim 1 wherein the hematite to bixbyite ratio is approximately 7:1. 4. A coating according to claim 3 wherein said hematite and bixbyite are applied as a solution comprising a ferric salt and manganese salt. 5. A coating according to claim 1 wherein the hematite to bixbyite ratio ranges from approximately 4:1 to 9:1. 6. A coating according to claim 5 wherein said hematite and bixbyite are applied as a solution comprising a ferric salt and manganese salt. 7. A coating according to claim 1 wherein the coating has a particle size in the range of 20-40 nanometers. 8. A coating according to claim 2 wherein the coating has a particle size in the range of 20-40 nanometers. 9. A coating according to claim 3 wherein the coating has a particle size in the range of 20-40 nanometers. 10. A coating according to claim 4 wherein the coating has a particle size in the range of 20-40 nanometers. 11. A coating according to claim 5 wherein the coating has a particle size in the range of 20-40 nanometers. 12. A coating according to claim 6 wherein the coating has a particle size in the range of 20-40 nanometers. 13. A flow through device comprising a ceramic or metal substrate and a ceramic coating, the coating comprising hematite (Fe2O3) and bixbyite ((Mn1.5,Fe0.5)O3) wherein the ratio of hematite to bixbyite ranges from 1:1 to 9:1. 14. The flow through device of claim 13, wherein said hematite and bixbyite are applied as a solution comprising a ferric salt and a manganese salt. 15. The flow through device of claim 13, wherein the hematite to bixbyite ratio is approximately 7:1. 16. The flow through device of claim 15, wherein said hematite and bixbyite are applied as solution comprising a ferric salt and a manganese salt. 17. The flow through device of claim 13 wherein the hematite to bixbyite ratio ranges from approximately 4:1 to 9:1. 18. The flow through device of claim 17 wherein said hematite and bixbyite are applied as solution comprising a ferric salt and a manganese salt. 19. A coating according to claim 13 wherein the coating has a particle size in the range of 20-40 nanometers. 20. A coating according to claim 14 wherein the coating has a particle size in the range of 20-40 nanometers. 21. A coating according to claim 15 wherein the coating has a particle size in the range of 20-40 nanometers. 22. A coating according to claim 16 wherein the coating has a particle size in the range of 20-40 nanometers. 23. A coating according to claim 17 wherein the coating has a particle size in the range of 20-40 nanometers. 24. A coating according to claim 18 wherein the coating has a particle size in the range of 20-40 nanometers. 25. An apparatus for reducing soot from diesel engine exhaust that comprises: a flow through device for receiving the exhaust comprising a ceramic or metal substrate and a ceramic coating, the coating comprising hematite (Fe2O3) and bixbyite ((Mn1.5,Fe0.5)O3), wherein the ratio of hematite to bixbyite ranges from 1:1 to 9:1; and wherein said flow through device is in fluid communication with a diesel particulate filter comprising: a filter, a first coating comprising a tin oxide, an aluminum oxide and a zirconium oxide, and a second coating comprising platinum or other precious metal. 26. An apparatus according to claim 25 wherein the first coating further comprises silicon dioxide and lanthanum oxide. 27. An apparatus according to claim 25 wherein the first coating further comprises silicon dioxide and a lanthanoid oxide selected from the group consisting of cerium, praseodymium, neodymium, promethium, samarium, europium, thulium, gadolinium, terbium, dysprosium, holmium, erbium, ytterbium and lutetium. 28. An apparatus according to claim 25 wherein the zirconium oxide is partially stabilized with up to 12 mole-% of yttrium lanthanum oxide. 29. An apparatus according to claim 26 wherein the zirconium oxide is partially stabilized with up to 12 mole-% of yttrium lanthanum oxide. 30. An apparatus according to claim 27 wherein the zirconium oxide is partially stabilized with up to 12 mole-% of yttrium lanthanum oxide. 31. An apparatus according to claim 25 wherein the molar ratio of the tin oxide is approximately 0.53, the molar ratio of the aluminum oxide is approximately 0.14 and the molar ratio of the zirconium oxide is approximately 0.24. 32. An apparatus according to claim 26 wherein the molar ratio of the tin oxide is approximately 0.53, the molar ratio of the aluminum oxide is approximately 0.14, the molar ratio of the zirconium oxide is approximately 0.24, the molar ratio of the silicon dioxide is approximately 0.04 and the molar ratio of the lanthanum oxide is approximately 0.05. 33. An apparatus according to claim 27 wherein the molar ratio of the tin oxide is approximately 0.53, the molar ratio of the aluminum oxide is approximately 0.14, the molar ratio of the zirconium oxide is approximately 0.24, the molar ratio of the silicon dioxide is approximately 0.04 and the molar ratio of the lanthanoid oxide is approximately 0.05. 34. An apparatus according to claim 31 wherein the zirconium oxide is partially stabilized with up to 12 mole-% of yttrium lanthanum oxide. 35. An apparatus according to claim 32 wherein the zirconium oxide is partially stabilized with up to 12 mole-% of yttrium lanthanum oxide. 36. An apparatus according to claim 33 wherein the zirconium oxide is partially stabilized with up to 12 mole-% of yttrium lanthanum oxide.
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