Particulate matter purifying material, filter catalyst for purifying particulate matter using particulate matter purifying material, and method of regenerating filter catalyst for purifying particulate matter
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01N-003/00
F01N-003/02
F01N-003/022
B01D-046/00
B01D-046/24
B01D-053/94
B01J-023/00
B01J-023/10
B01J-023/20
B01J-023/63
B01J-023/648
B01J-023/66
C01F-017/00
B01J-035/00
B01J-035/04
B01J-035/10
B01J-037/03
출원번호
US-0130348
(2009-11-20)
등록번호
US-9222382
(2015-12-29)
우선권정보
JP-2008-297932 (2008-11-21)
국제출원번호
PCT/JP2009/069689
(2009-11-20)
§371/§102 date
20110520
(20110520)
국제공개번호
WO2010/058834
(2010-05-27)
발명자
/ 주소
Akama, Hiroshi
Onodera, Hitoshi
Nishizawa, Toru
Hanaki, Yasunari
Morisaka, Hideaki
출원인 / 주소
NISSAN MOTOR CO., LTD.
대리인 / 주소
Foley & Lardner LLP
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
A particulate matter purifying material is used for a filter catalyst for purifying particulate matter that is disposed in an exhaust gas flow path of an internal combustion engine, traps the particulate matter in exhaust gas generated in the internal combustion engine, and burns the particulate mat
A particulate matter purifying material is used for a filter catalyst for purifying particulate matter that is disposed in an exhaust gas flow path of an internal combustion engine, traps the particulate matter in exhaust gas generated in the internal combustion engine, and burns the particulate matter to be deposited, so as to be regenerated. The particulate matter purifying material includes an oxide containing cerium (Ce) having an oxygen storage-release capacity, and at least one metal (Me) selected from the group consisting of Zr, Y, La, Pr, Sr, Nb and Nd, wherein a content ratio (Ce:Me) of cerium to the metal is 6:4 to 9:1 in terms of an atomic ratio, and a degree of crystallinity (CR) represented by the following formula (1) is within a range of 25 to 60%: Degree of crystallinity (CR)=I/I0×100(%) (1) wherein I represents an X-ray diffraction peak intensity with regard to a (111) plane of a CeO2 phase in the particulate matter purifying material, and I0 represents the X-ray diffraction peak intensity with regard to the (111) plane of the CeO2 phase after the particulate matter purifying material is baked in air at 1000° C.
대표청구항▼
1. A particulate matter purifying material used for a filter catalyst for purifying exhaust gas containing particulate matter, the filter catalyst being disposed in an exhaust gas flow path of an internal combustion engine, trapping the particulate matter in the exhaust gas generated in the internal
1. A particulate matter purifying material used for a filter catalyst for purifying exhaust gas containing particulate matter, the filter catalyst being disposed in an exhaust gas flow path of an internal combustion engine, trapping the particulate matter in the exhaust gas generated in the internal combustion engine, and burning the particulate matter, so as to be regenerated, the particulate matter purifying material comprising:an oxide containing: cerium (Ce) having an oxygen storage-release capacity; and at least one metal (Me) selected from the group consisting of zirconium (Zr), yttrium (Y), lanthanum (La), praseodymium (Pr), strontium (Sr), niobium (Nb) and neodymium (Nd),wherein a content ratio (Ce:Me) of cerium to the metal is 6:4 to 9:1 in terms of an atomic ratio, anda degree of crystallinity (CR) represented by the following formula (1) is within a range of 36 to 60%: Degree of crystallinity (CR)=I/I0×100(%) (1) wherein I represents an X-ray diffraction peak intensity with regard to a (111) plane of a CeO2 phase in the particulate matter purifying material, and I0 represents the X-ray diffraction peak intensity with regard to the (111) plane of the CeO2 phase after the particulate matter purifying material is baked in air at 1000° C. 2. The particulate matter purifying material according to claim 1, wherein a crystallite diameter represented by the following formula (2) in compliance with Scherrer's equation is within a range of 10 nm to 22 nm with regard to the (111) plane of the CeO2 phase in the particulate matter purifying material: D=λ/β cos θ(nm) (2)wherein λ represents a measuring X-ray wavelength (nm), β represents a full width at half maximum β1/2 (radian) of a diffraction line according to a crystallite dimension, and θ represents a Bragg angle of the diffraction line. 3. The particulate matter purifying material according to claim 1, wherein a specific surface area is within a range of 15 to 40 m2/g. 4. A filter catalyst for purifying exhaust gas containing particulate matter that is disposed in an exhaust gas flow path of an internal combustion engine, traps the particulate matter in the exhaust gas generated in the internal combustion engine, and burns the particulate matter, so as to be regenerated, the filter catalyst comprising:a filter substrate made of porous ceramics having continuous fine pores; anda catalyst layer formed on a wall of the filter substrate,wherein the catalyst layer contains: 25 to 100 g/L of a mixture of the particulate matter purifying material according to claim 1 and noble metal; and 0.25 to 1.0 g/L of the noble metal, per unit volume of the filter substrate. 5. The filter catalyst for purifying exhaust gas containing particulate matter according to claim 4, wherein a porosity of the filter substrate is within a range of 42 to 62%. 6. The filter catalyst for purifying exhaust gas containing particulate matter according to claim 4, wherein the filter substrate is cordierite-based, and a porosity thereof is within a range of 56 to 62%. 7. The filter catalyst for purifying exhaust gas containing particulate matter according to claim 4, wherein the filter substrate is made of silicon carbide (SiC), and a porosity thereof is within a range of 42 to 56%. 8. The filter catalyst for purifying exhaust gas containing particulate matter according to claim 4, wherein the noble metal is at least one selected from the group consisting of platinum (Pt), palladium (Pd) and silver (Ag). 9. A method of regenerating a filter catalyst for purifying exhaust gas containing particulate matter, comprising: preparing the filter catalyst for purifying the exhaust gas containing the particulate matter according to claim 4; andcontrolling an inner temperature of the filter catalyst to be 800° C. or less, thereby burning and removing the particulate matter deposited on the filter catalyst. 10. The method of regenerating the filter catalyst for purifying exhaust gas containing particulate matter according to claim 9, further comprising: detecting a deposited amount of the particulate matter on the filter catalyst; andwhen more than a certain amount of the particulate matter is deposited, controlling a temperature of the exhaust gas at an inlet of the filter catalyst to be 350 to 550° C., and controlling an oxygen concentration to be 8% or more, thereby burning and removing the particulate matter.
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이 특허에 인용된 특허 (7)
Hatanaka, Miho; Tanabe, Toshitaka; Nagai, Yasutaka; Yamamoto, Toshio; Dohmae, Kazuhiko; Takagi, Nobuyuki; Miura, Masahide; Ikeda, Yasuo, Catalyst for purification of exhaust gas, regeneration method for the catalyst, and apparatus and method for purification of exhaust gas using the catalyst.
Brezny, Rasto; Koranne, Manoj M; Egami, Takeshi; Mamontov, Eugene, Catalyst support material having high oxygen storage capacity and method of preparation thereof.
Bonadies,Joseph V.; Goulette,David A.; Masoudi,Mansour; Kupe,Joachim; Bosch,Russell H., Method and apparatus for controlling regeneration temperature in a diesel particulate trap.
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