A catalyst bed and method for reducing nitrogen oxides
US-2019001266-A1 · Jan 3, 2019 · US
Reactor for reducing nitrogen oxides
US11911728B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11911728-B2 |
| Application number | US-202117466206-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 22, 2021 |
| Priority date | Dec 22, 2015 |
| Publication date | Feb 27, 2024 |
| Grant date | Feb 27, 2024 |
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- Title
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Abstract
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A reactor for reducing the concentration of NOx in a stream comprising: an inlet for the stream; an outlet for a stream containing a reduced concentration of NOx; one or more catalyst beds comprising a ceramic or metallic foam with a NOx reduction catalyst; one or more flow paths from the inlet to the outlet that passes through at least one catalyst bed wherein the catalyst beds are closed at the top and bottom so that the flow path through the catalyst bed passes through the sides of the catalyst bed in a lateral flow is described.
First claim
Opening claim text (preview).
The invention claimed is: 1. A catalyst for reducing NOx in an exhaust gas comprising: a ceramic or metallic foam support; and one or more NOx reduction catalysts disposed on the ceramic or metallic foam support, wherein the one or more NOx reduction catalysts comprises a carrier material and one or more metal compounds disposed on the carrier material, wherein the NOx reduction catalyst has a bimodal pore distribution with more than 90% of a pore volume present in pores having a diameter of at most 100 nanometers (nm), and wherein the pore volume is present in pores having a diameter between approximately 1 nm and approximately 104 nm. 2. The catalyst of claim 1 , wherein a surface area of the one or more NOx reduction catalysts is between 70 square meters/gram (m 2 /g) and 150 m 2 /g as measured by nitrogen adsorption. 3. The catalyst of claim 1 , wherein the ceramic or metallic foam has a void space of at least 60%. 4. The catalyst of claim 1 , wherein the ceramic or metallic foam has from approximately 5 to approximately 50 pores per inch. 5. The catalyst of claim 1 , wherein the ceramic or metallic foam has a density of from approximately 0.4 to approximately 0.75 grams/cubic centimeter (g/cm 3 ). 6. The catalyst of claim 1 , wherein the one or more metal compounds comprises vanadium, molybdenum, tungsten, or mixtures thereof. 7. The catalyst of claim 1 , wherein the carrier material is titania, alumina, silicon-alumina, magnesia-alumina, calcium oxide-alumina, chromium oxide-alumina, or silica-chromium oxide-alumina.
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Classifications
Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title
- B01D53/8631Primary
Processes characterised by a specific device · CPC title
Nitrogen oxides · CPC title
Nitrogen oxides · CPC title
Processes characterised by a specific device · CPC title
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- What does patent US11911728B2 cover?
- A reactor for reducing the concentration of NOx in a stream comprising: an inlet for the stream; an outlet for a stream containing a reduced concentration of NOx; one or more catalyst beds comprising a ceramic or metallic foam with a NOx reduction catalyst; one or more flow paths from the inlet to the outlet that passes through at least one catalyst bed wherein the catalyst beds are closed at t…
- Who is the assignee on this patent?
- Shell Oil Co, Shell Usa Inc
- What technology area does this patent fall under?
- Primary CPC classification B01D53/8631. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Feb 27 2024 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).