Application of synergized-PGM with ultra-low PGM loadings as close-coupled three-way catalysts for internal combustion engines
US-10533472-B2 · Jan 14, 2020 · US
Exhaust gas purification system
US2022228520A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022228520-A1 |
| Application number | US-202117540741-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 2, 2021 |
| Priority date | Jan 19, 2021 |
| Publication date | Jul 21, 2022 |
| Grant date | — |
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Abstract
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An exhaust gas purification system of the present disclosure includes a first exhaust gas purification device that purifies exhaust gas discharged from an internal combustion engine and a second exhaust gas purification device that additionally purifies the exhaust gas purified by the first exhaust gas purification device, wherein the exhaust gas is exhaust gas with a gaseous composition in which an amount of reducing agents is in excess compared to a stoichiometric gaseous composition and a gaseous composition in which an amount of oxidants is in excess compared to the stoichiometric gaseous composition are alternately switched between, the first exhaust gas purification device includes a three-way catalyst, and the second exhaust gas purification device includes an exhaust gas purification catalyst containing spinel-type MgAl x Fe 2.00−x O 4.00 supporting particles on which Rh is supported, where 0.00<×≤1.50.
First claim
Opening claim text (preview).
What is claimed is: 1 . An exhaust gas purification system that purifies exhaust gas discharged from an internal combustion engine, comprising: a first exhaust gas purification device that purifies the exhaust gas; and a second exhaust gas purification device that additionally purifies the exhaust gas purified by the first exhaust gas purification device, wherein the exhaust gas is exhaust gas with a gaseous composition in which an amount of reducing agents is in excess compared to a stoichiometric gaseous composition and a gaseous composition in which an amount of oxidants is in excess compared to the stoichiometric gaseous composition are alternately switched between, wherein the first exhaust gas purification device includes a three-way catalyst, and wherein the second exhaust gas purification device includes an exhaust gas purification catalyst containing spinel-type MgAl x Fe 2.00−x O 4.00 supporting particles on which Rh is supported, where 0.00<×≤1.50. 2 . The exhaust gas purification system according to claim 1 , wherein 0.5≤×≤1.5. 3 . The exhaust gas purification system according to claim 1 , wherein the amount of Rh supported in the exhaust gas purification catalyst with respect to the total mass of the exhaust gas purification catalyst is 0.1 mass % to 1.0 mass %. 4 . The exhaust gas purification system according to claim 1 , wherein a lattice constant a of the spinel-type MgAl x Fe 2.00−x O 4.00 supporting particles is 8.10 Å to 8.35 Å. 5 . The exhaust gas purification system according to claim 1 , wherein a crystallite diameter of the spinel-type MgAl x Fe 2.00−x O 4.00 supporting particles is 4 nm to 43 nm. 6 . The exhaust gas purification system according to claim 1 , wherein a specific surface area of the spinel-type MgAl x Fe 2.00−x O 4.00 supporting particles according to a BET method is 11 m 2 /g to 150 m 2 /g. 7 . A vehicle in which the exhaust gas purification system according to claim 1 is installed.
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Classifications
Specific surface · CPC title
Spinels · CPC title
characterised by a specific device · CPC title
Diesel engines and lean burn gasoline engines · CPC title
- B01D53/945Primary
characterised by a specific catalyst · CPC title
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- What does patent US2022228520A1 cover?
- An exhaust gas purification system of the present disclosure includes a first exhaust gas purification device that purifies exhaust gas discharged from an internal combustion engine and a second exhaust gas purification device that additionally purifies the exhaust gas purified by the first exhaust gas purification device, wherein the exhaust gas is exhaust gas with a gaseous composition in whi…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B01D53/945. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Jul 21 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).