Exhaust treatment method and apparatus having particulate filters and scr
US-2024159174-A1 · May 16, 2024 · US
Exhaust gas purification filter
US11840949B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11840949-B2 |
| Application number | US-202117487254-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 28, 2021 |
| Priority date | Mar 29, 2019 |
| Publication date | Dec 12, 2023 |
| Grant date | Dec 12, 2023 |
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- Title
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Abstract
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An exhaust gas purification filter includes a honeycomb structure part and sealing parts. The honeycomb structure part has a porous partition wall and a plurality of cells defined by the partition wall to form exhaust gas flow paths. The sealing parts seal alternately a gas inflow-side end face or a gas outflow-side end face of the cells. The exhaust gas purification filter includes fine pores with diameters of 10 μm or less measured by the mercury intrusion method that account for 5% or more of all pores by volume in the honeycomb structure part. The partition wall has a plurality of communication pores communicating between the cells adjacent to the partition wall and has constricted communication pore of which a largest diameter Φ1 and a smallest diameter Φ2 satisfy relationships Φ1≥50, 100×Φ2/Φ1≤20.
First claim
Opening claim text (preview).
What is claimed is: 1. An exhaust gas purification filter comprising: a honeycomb structure part that has a porous partition wall and a plurality of cells defined by the partition wall to form an exhaust gas flow path; and a sealing part that seals alternately a gas inflow-side end face or a gas outflow-side end face of the cells, wherein the exhaust gas purification filter includes fine pores with diameters of 10 μm or less measured by the mercury intrusion method that account for a range of 5% or more and 25% or less of all pores by volume in the honeycomb structure part, and an average diameter of the pores in the partition wall is a range of 15 μm or more and 22 μm or less and a porosity of the partition wall is a range of 60% or more and 70% or less, the partition wall has a plurality of communication pores communicating between cells adjacent to the partition wall and has constricted communication pores of which a largest diameter Φ1 (μm) and a smallest diameter Φ2 (μm) satisfy relationships Φ1≥50 and 100×Φ2/Φ1≤20, the communication pores including the fine pores, and the proportion of the constricted communication pores in all the communication pores is 20% or more.
Assignees
Inventors
Classifications
Honeycombs · CPC title
- F01N3/0222Primary
the structure being monolithic, e.g. honeycombs · CPC title
Other inorganic materials, e.g. ceramics · CPC title
of the honeycomb walls or cells · CPC title
Porosity · CPC title
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- What does patent US11840949B2 cover?
- An exhaust gas purification filter includes a honeycomb structure part and sealing parts. The honeycomb structure part has a porous partition wall and a plurality of cells defined by the partition wall to form exhaust gas flow paths. The sealing parts seal alternately a gas inflow-side end face or a gas outflow-side end face of the cells. The exhaust gas purification filter includes fine pores …
- Who is the assignee on this patent?
- Denso Corp
- What technology area does this patent fall under?
- Primary CPC classification F01N3/0222. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Dec 12 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).