Invention Grant
- Patent Title: Exhaust gas-purification catalyst having multi-layer structure including precious metal thin layer as top layer, and method for producing same
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Application No.: US17600640Application Date: 2020-03-31
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Publication No.: US12097483B2Publication Date: 2024-09-24
- Inventor: Do-kyun Lee , Sang-yun Han , Seung Chul Na
- Applicant: HEESUNG CATALYSTS CORPORATION
- Applicant Address: KR Gyeonggi-do
- Assignee: HEESUNG CATALYSTS CORPORATION
- Current Assignee: HEESUNG CATALYSTS CORPORATION
- Current Assignee Address: KR Gyeonggi-do
- Agency: Ballard Spahr LLP
- Priority: KR 20190039571 2019.04.04
- International Application: PCT/KR2020/004397 2020.03.31
- International Announcement: WO2020/204571A 2020.10.08
- Date entered country: 2021-10-01
- Main IPC: B01J23/42
- IPC: B01J23/42 ; B01J23/44 ; B01J35/00 ; B01J37/02 ; F01N3/10

Abstract:
Disclosed is an exhaust gas purification catalyst with a multilayered structure including an ultra-thin layer with a thickness of 20 micrometers or less and containing Rh, Pd, or both as at least one precious metal component, and to a method of manufacturing the same. The method includes a step of forming an ultra-thin layer having a thickness of 20 micrometers or less as the top layer of the catalyst by applying a polymer coating solution containing a polymer having a functional group capable of chelating with the precious metal component(s) on the surface of the multilayer structure of the catalyst. The disclosed catalyst exhibits improved removal efficiency for THC, CO, and NOx contained compared to an existing thin film-type catalyst. Since the disclosed catalyst is coated with a thin coating layer containing at least a portion of precious metal components, the disclosed catalyst exhibits improved performance while using the same amount of precious metal components as in conventional catalysts.
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