Honeycomb filter
US-2016067653-A1 · Mar 10, 2016 · US
Filter
US10137412B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10137412-B2 |
| Application number | US-201615324278-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 7, 2016 |
| Priority date | Jan 7, 2016 |
| Publication date | Nov 27, 2018 |
| Grant date | Nov 27, 2018 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present invention provides a filter comprising a base material and a catalytic substance provided within the base material, wherein the base material comprises a plurality of cells forming gas flow paths and having a gas inflow-side end portion and outflow-side end portion, and a plurality of porous partition walls defining said cells, the end portions of at least some of the cells being closed off, and the void occupancy of the catalytic substance within the pores of the partition walls is 10% or less.
First claim
Opening claim text (preview).
The invention claimed is: 1. A filter comprising a base material and a catalytic substance provided within the base material, wherein the base material comprises a plurality of cells forming gas flow paths and having a gas inflow-side end portion and outflow-side end portion, the base material has a length wherein the length is the distance from the gas inflow-side end portion and outflow-side end portion, and a plurality of porous partition walls defining said cells, the end portions of some of the cells being closed off, wherein only one of the gas inflow-side end portion and outflow-side end portion is partially closed off, the catalytic substance is present on the gas inflow portion of the base material, and the void occupancy of the catalytic substance within the pores of the partition walls is 10% or less. 2. The filter as claimed in claim 1 , wherein the catalytic substance has a mean particle size D50 of 1/10 or less of the mean pore size D50 of the pores in the partition walls. 3. The filter as claimed in claim 1 , wherein the catalytic substance comprises noble metals and the concentration ratio of noble metals contained in the catalytic substance at the gas inflow-side end portion and outflow-side end portion is between 10/90 and 90/10. 4. The filter as claimed in claim 1 , wherein the catalytic substance is included in a range of between 10% and 50% of the total length of the partition walls in the lengthwise direction, from the gas inflow-side end portion. 5. The filter as claimed in claim 1 , comprising Pt and Pd in a ratio of between 1:1 and 10:1 as the catalytic substance. 6. The filter as claimed in claim 1 , further comprising at least one material selected from the group consisting of oxygen storage materials, alkali metals and perovskite materials. 7. The filter as claimed in claim 1 , wherein the porosity of the base material is between 40% and 70%. 8. The filter as claimed in claim 1 , wherein the void occupancy of the catalytic substance is less than 5%. 9. The filter as claimed in claim 1 , wherein the amount of catalytic substance is present as a gradient in the lengthwise direction of the filter.
Assignees
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Classifications
Silver · CPC title
Iridium · CPC title
Gold · CPC title
Wall flow filters · CPC title
Platinum · CPC title
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Frequently asked questions
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- What does patent US10137412B2 cover?
- The present invention provides a filter comprising a base material and a catalytic substance provided within the base material, wherein the base material comprises a plurality of cells forming gas flow paths and having a gas inflow-side end portion and outflow-side end portion, and a plurality of porous partition walls defining said cells, the end portions of at least some of the cells being cl…
- Who is the assignee on this patent?
- Johnson Matthey Plc, Johnson Matthey Japan G K
- What technology area does this patent fall under?
- Primary CPC classification B01D53/944. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Nov 27 2018 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).