Ceramic-made filter and process for production thereof
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0089795
(2001-07-24)
|
우선권정보 |
JP-0240456 (2000-08-08) |
국제출원번호 |
PCT/JP01/06362
(2002-04-23)
|
§371/§102 date |
20020423
(20020423)
|
국제공개번호 |
WO02/12687
(2002-02-14)
|
발명자
/ 주소 |
- Noda, Naomi
- Yamada, Kanji
- Kasai, Yoshiyuki
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
6 |
초록
▼
A ceramic-made filter for capturing the particulates present in the exhaust gas discharged from diesel engines, wherein a ceramic particles layer made of heat-resistant ceramic particles is formed on a filter by coating, the heat-resistant ceramic particles having a BET specific surface area of 300
A ceramic-made filter for capturing the particulates present in the exhaust gas discharged from diesel engines, wherein a ceramic particles layer made of heat-resistant ceramic particles is formed on a filter by coating, the heat-resistant ceramic particles having a BET specific surface area of 300 m2/g or less. In this ceramic-made filter, the melting of the filter caused by the ash remaining and accumulating after the particulates captured by the filter have been burnt, can be prevented easily without using a large system or the like.
대표청구항
▼
1. A ceramic-made filter for capturing particulates present in exhaust gas discharged from diesel engines, wherein a ceramic particles layer made of heat-resistant ceramic particles is formed on a filter by coating so as to substantially avoid direct contact between the filter and ash remaining and
1. A ceramic-made filter for capturing particulates present in exhaust gas discharged from diesel engines, wherein a ceramic particles layer made of heat-resistant ceramic particles is formed on a filter by coating so as to substantially avoid direct contact between the filter and ash remaining and accumulating after the particulates captured by the filter have been burnt, the heat-resistant ceramic particles having a BET specific surface area of 300 m2/g or less and wherein the heat-resistant ceramic particles have an average particle diameter of 2 to 20 μm.2. A ceramic-made filter according to claim 1, wherein the BET specific surface area of the heat-resistant ceramic particles is 5 to 100 m2/g.3. A ceramic-made filter according to claim 1, wherein the heat-resistant ceramic particles are made of at least one kind of ceramic material selected from the group consisting of alumina, silica, zirconia, titania, magnesia and a compound oxide thereof.4. A ceramic-made filter according to claim 1, wherein the heat-resistant ceramic particles contain Si in an amount of 10% by weight or less in terms of oxide.5. A ceramic-made filter according to claim 1, wherein the heat-resistant ceramic particles contain an alkali metal in an amount of 1% by weight or less in terms of oxide.6. A ceramic-made filter according to claim 1, which has a honeycomb structure and wherein each cell of the honeycomb structure is sealed at either of the inlet and outlet ends of the honeycomb structure and, at each end of the honeycomb structure, each sealed cell end is surrounded by unsealed cell ends via cell walls.7. A ceramic-made filter according to claim 1, wherein the ceramic particles layer has a thickness of 2 to 100 μm.8. A ceramic-made filter according to claim 6, wherein the cell walls forming each cell have a thickness of 50 to 500 μm.9. A ceramic-made filter according to claim 6, wherein the heat-resistance ceramic particles constituting the ceramic particles layer are loaded in an amount of 5 to 250 g/l of honeycomb volume.10. A ceramic-made filter according to claim 6, wherein the honeycomb structure has a cell density of 50 to 500 cells/in.2 (7.8 to 78 cells/cm2).11. A ceramic-made filter according to claim 1, which is made of cordierite.12. A ceramic-made filter according to claim 1, wherein a catalyst component is mixed into the ceramic particles layer.13. A ceramic-made filter according to claim 1, wherein a catalyst component is coated on the ceramic particles layer.14. A process for producing a ceramic-made filter, which comprises coating, on the surface of a filter material made of a porous ceramic, a slurry containing at least heat-resistant ceramic particles having (1) a BET specific surface area of 300 m2/g or less and (2) an average particle diameter of 2 to 20 μm and a binder at proportions satisfying the following formula, to form a ceramic particles layer:amount of binder solid (calculated as oxide) /[weight of heat-resistant ceramic particles +amount of binder solid (calculated as oxide)]?0.02. 15. A process for producing a ceramic-made filter according to claim 14, wherein the slurry contains at least heat-resistant ceramic particles having a SET specific surface area of 300 m2/g or less and a binder at proportions satisfying the following formula:0.25?amount of binder solid (calculated as oxide)/[weight of heat-resistant ceramic particles+amount of binder solid (calculated as oxide)]?0.05. 16. A process for producing a ceramic-made filter according to claim 14, wherein the binder contains an alkali metal in an amount of 5% by weight or less in terms of oxide, relative to the binder solid in terms of oxide.17. In a method of using a ceramic-made filter in a system wherein particulates captured on said filter are burnt and removed by a heater or a catalytic reaction, the improvement comprising using as said ceramic-made filter a ceramic-made filter according to claim 1.18. A ceramic-made filter according to claim 1, wherein the heat resistant ceramic particles and a binder for the ceramic particles satisfy the following formula:0.25?amount of binder solid (calculated as oxide)/[weight of heat-resistant ceramic particle+amount of binder solid (calculated as oxide)].
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