Copper CHA zeolite catalysts
US-9839905-B2 · Dec 12, 2017 · US
Copper CHA zeolite catalysts
US11845067B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11845067-B2 |
| Application number | US-202218055708-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 15, 2022 |
| Priority date | Feb 27, 2007 |
| Publication date | Dec 19, 2023 |
| Grant date | Dec 19, 2023 |
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- Title
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- Abstract
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Abstract
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Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
First claim
Opening claim text (preview).
What is claimed is: 1. A staged catalyst with a first catalyst zone comprising a first SCR catalyst on a filter and a second downstream catalyst zone comprising a second SCR catalyst on a substrate, wherein the first SCR catalyst comprises a CuCHA zeolite catalyst having a mole ratio of silica to alumina greater than about 15 and an atomic ratio of copper to aluminum exceeding about 0.25 and containing an amount of free copper exceeding ion-exchanged copper, and the second catalyst zone promotes oxidation of ammonia. 2. The staged catalyst of claim 1 , wherein the second SCR catalyst comprises a CuCHA zeolite catalyst having a mole ratio of silica to alumina greater than about 15 and an atomic ratio of copper to aluminum exceeding about 0.25. 3. The staged catalyst of claim 1 , wherein the second catalyst zone comprises a platinum group metal. 4. The staged catalyst of claim 3 , wherein the platinum group metal comprises Pt. 5. The staged catalyst of claim 4 , wherein the platinum content is between 0.02% and 1.0% by weight of the second SCR catalyst, and the platinum loading is from about 0.5 g/in 3 to about 5 g/in 3 .
Assignees
Inventors
Classifications
Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title
- B01J29/723Primary
CHA-type, e.g. Chabazite, LZ-218 · CPC title
Nitrogen oxides (B01D53/60 takes precedence) · CPC title
Processes characterised by a specific catalyst · CPC title
Processes characterised by a specific catalyst · CPC title
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Frequently asked questions
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- What does patent US11845067B2 cover?
- Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:…
- Who is the assignee on this patent?
- Basf Corp
- What technology area does this patent fall under?
- Primary CPC classification B01J29/723. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Dec 19 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).