Diesel Oxidation Catalyst With Nox Adsorber Activity
Patent No. EP3593894 (titled "Diesel Oxidation Catalyst With Nox Adsorber Activity") was filed by Johnson Matthey Public on Apr 1, 2015. The application was issued on Nov 23, 2022.
Patent Summary
An exhaust system for treating diesel engine exhaust gas comprises an oxidation catalyst and an emissions control device, specifically a selective catalytic reduction (SCR) catalyst or a selective catalytic reduction filter (SCRF). The oxidation catalyst consists of a substrate with an inlet and outlet end, featuring two distinct washcoat regions. A first washcoat region, disposed directly on the substrate, adsorbs $\text{NO}_x$ and comprises a medium pore zeolite catalyst containing palladium (Pd). A second washcoat region, supported on the substrate, oxidizes nitric oxide (NO) and comprises platinum (Pt) and a support material. This configuration enables $\text{NO}_x$ storage at low temperatures via the zeolite catalyst before NO oxidation occurs in the second region.
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Date
Description
EP3593894
- Application Number
- EP19195388A
- Filing Date
- Apr 1, 2015
- Status
- Granted And Under Opposition
- Oct 21, 2022
- Publication Date
- Nov 23, 2022
- External Links
- Slate, Register , Google Patents