Diesel particulate filter and exhaust emission control system

• US 20070196246A1
• Filed: 02/20/2007
• Published: 08/23/2007
• Est. Priority Date: 02/21/2006
• Status: Active Grant

• Current Assignee: Dowa Electronics Materials Co. Ltd. (DOWA Holdings Company Limited)
• Original Assignee: DOWA Electronics Company Limited, Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Inventors: Yano, Takuya
• Granted Patent: US 7,923,408 B2
• Time in Patent Office: Days
• US Class Current: 422/177
• CPC Class Codes: B01D 2255/2042 Barium
• CPC Class Codes: B01D 2255/2073 Manganese
• CPC Class Codes: B01D 2255/20738 Iron
• CPC Class Codes: B01D 2255/402 Perovskites
• CPC Class Codes: B01D 2258/012 Diesel engines and lean burn gasoline engines
• CPC Class Codes: B01D 53/944 Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts three-way-catalysts [TWC] B01D53/9445
• CPC Class Codes: B01D 53/945 characterised by a specific catalyst
• CPC Class Codes: B01J 23/002 Mixed oxides other than spinels, e.g. perovskite
• CPC Class Codes: B01J 23/8892 Manganese
• CPC Class Codes: B01J 23/8986 with manganese, technetium or rhenium
• CPC Class Codes: B01J 2523/00 Constitutive chemical elements of heterogeneous catalysts
• CPC Class Codes: B01J 2523/25 Barium
• CPC Class Codes: B01J 2523/3706 Lanthanum
• CPC Class Codes: B01J 2523/72 Manganese
• CPC Class Codes: B01J 2523/842 Iron
• CPC Class Codes: B01J 35/04 Foraminous structures, sieves, grids, honeycombs
• CPC Class Codes: B01J 35/56 Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
• CPC Class Codes: C01G 45/1264 containing rare earth, e.g. La1-xCaxMnO3, LaMnO3
• CPC Class Codes: C01G 49/009 Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01P 2002/34 perovskite-type (ABO3)
• CPC Class Codes: C01P 2002/77 : by unit-cell parameters, atom positions or structure diagrams
• CPC Class Codes: C01P 2006/12 : Surface area
• CPC Class Codes: C01P 2006/16 : Pore diameter
• CPC Class Codes: C04B 2235/3215 : Barium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3227 : Lanthanum oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/443 : Nitrates or nitrites
• CPC Class Codes: C04B 2235/5409 : expressed by specific surface values
• CPC Class Codes: C04B 2235/5436 : micrometer sized, i.e. from 1 to 100 micron
• CPC Class Codes: C04B 2235/6562 : Heating rate
• CPC Class Codes: C04B 2235/768 : Perovskite structure ABO3
• CPC Class Codes: C04B 35/016 : based on manganites
• CPC Class Codes: C04B 35/2641 : Compositions containing one or more ferrites of the group comprising rare earth metals and one or more ferrites of the group comprising alkali metals, alkaline earth metals or lead
• CPC Class Codes: C04B 35/6261 : Milling
• CPC Class Codes: F01N 13/0097 : the purifying devices are arranged in a single housing
• CPC Class Codes: F01N 2330/06 : Ceramic, e.g. monoliths
• CPC Class Codes: F01N 3/0222 : the structure being monolithic, e.g. honeycombs
• CPC Class Codes: F01N 3/0253 : adding fuel to exhaust gases
• CPC Class Codes: F01N 3/035 : with catalytic reactors , e.g. catalysed diesel particulate filters
• CPC Class Codes: F02B 37/00 : Engines characterised by provision of pumps driven at least for part of the time by exhaust
• CPC Class Codes: Y02T 10/12 : Improving ICE efficiencies

Abstract

To provide a diesel particulate filter that can lower the PM combustion start temperature and use material containing Si for a carrier. The carrier which has a filter function is allowed to support a perovskite type complex oxide expressed by formula (1):
La_1−xBa_xMn_yFe_1−yO₃  (1) (where 0<x<0.7 and 0≦y≦1).

Claims

1. A diesel particulate filter, comprising:

a carrier which has filter functions; and

a perovskite type complex oxide supported by the carrier and expressed by the following formula (1);

La<sub>1−

x</sub>Ba_xMn_yFe<sub>1−

y</sub>O₃ 

 

(1)

(where 0<

x<

0.7 and 0≦

y≦

1 in formula (1) above).

2. The diesel particulate filter according to claim 1 wherein 0.1≦

x≦

0.6 in formula (1) above.

3. The diesel particulate filter according to claim 1 wherein y=0 in formula (1) above.

4. The diesel particulate filter according to claim 1 wherein y=1 in formula (1) above.

5. The diesel particulate filter according to claim 1 wherein

the perovskite type complex oxide exists in a particulate form, fine pores are formed in the carrier, and

the particle size of the perovskite type complex oxide is smaller than the fine pore diameter of the carrier.

6. The diesel particulate filter according to claim 1 wherein

an oxidation catalyst containing at least one kind chosen from Pt, Rh, and Pd is supported by the carrier.

7. An exhaust emission control system installed in an exhaust gas passage of a diesel engine, comprising:

a diesel particulate filter that comprises a carrier which has filter functions and a perovskite type complex oxide supported by the carrier and expressed by the following formula (1); and

a carrier which supports an oxidation catalyst installed separately from the diesel particulate filter;

La<sub>1−

x</sub>Ba_xMn_yFe<sub>1−

y</sub>O₃ 

 

(1)

(where 0<

x<

0.7 and 0≦

y≦

1 in formula (1) above).

8. An exhaust emission control system installed in an exhaust gas passage of a diesel engine, comprising:

a diesel particulate filter that comprises a carrier which has filter functions and a perovskite type complex oxide supported by the carrier and expressed by the following formula (1); and

a carrier which supports an oxidation catalyst installed separately from the diesel particulate filter;

La<sub>1−

x</sub>Ba_xMn_yFe<sub>1−

y</sub>O₃ 

 

(1)

(where 0.1<

x<

0.6 and 0≦

y≦

1 in formula (1) above).

9. An exhaust emission control system installed in an exhaust gas passage of a diesel engine, comprising:

a diesel particulate filter that comprises a carrier which has filter functions and a perovskite type complex oxide supported by the carrier and expressed by the following formula (1); and

a carrier which supports an oxidation catalyst installed separately from the diesel particulate filter;

La<sub>1−

x</sub>Ba_xMn_yFe<sub>1−

y</sub>O₃ 

 

(1)

(where 0<

x<

0.7 and y=0 in formula (1) above).

10. An exhaust emission control system installed in an exhaust gas passage of a diesel engine, comprising:

a diesel particulate filter that comprises a carrier which has filter functions and a perovskite type complex oxide supported by the carrier and expressed by the following formula (1); and

a carrier which supports an oxidation catalyst installed separately from the diesel particulate filter;

La<sub>1−

x</sub>Ba_xMn_yFe<sub>1−

y</sub>O₃ 

 

(1)

(where 0<

x<

0.7 and y=1 in formula (1) above).

11. An exhaust emission control system installed in an exhaust gas passage of a diesel engine, comprising:

a diesel particulate filter that comprises a carrier which has filter functions and a perovskite type complex oxide supported by the carrier and expressed by the following formula (1), wherein the perovskite type complex oxide exists in a particulate form, fine pores are formed in the carrier, and the particle size of the perovskite type complex oxide is smaller than the fine pore diameter of the carrier; and

a carrier which supports an oxidation catalyst installed separately from the diesel particulate filter;

La<sub>1−

x</sub>Ba_xMn_yFe<sub>1−

y</sub>O₃ 

 

(1)

(where 0<

x<

0.7 and 0≦

y≦

1 in formula (1) above).

12. An exhaust emission control system installed in an exhaust gas passage of a diesel engine, comprising:

a diesel particulate filter that comprises a carrier which has filter functions, a perovskite type complex oxide supported by the carrier and expressed by the following formula (1), and an oxidation catalyst supported by the carrier containing at least one kind chosen from Pt, Rh, and Pd; and

a carrier which supports an oxidation catalyst installed separately from the diesel particulate filter;

La<sub>1−

x</sub>Ba_xMn_yFe<sub>1−

y</sub>O₃ 

 

(1)

(where 0<

x<

0.7 and 0≦

y≦

1 in formula (1) above).