Exhaust cleaning catalyst
US9675970B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2014 |
| Grant date | Jun 13, 2017 |
| Priority date | — |
| Expiry date | Dec 9, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Provided is an exhaust cleaning catalyst that exhibits higher NOX-reducing activities at the time of engine restart while maintaining its catalytic activities during normal traveling. This invention provides an exhaust cleaning catalyst including a substrate and a catalyst coating layer including CeO2. Catalyst coating layer is constituted in its thickness direction with multiple coating layers. In a top coating layer located at the outermost surface, the CeO2 content in a top coating layer's upstream portion is less than the CeO2 content in a top coating layer's downstream portion. In a bottom coating layer near substrate, the CeO2 content in a bottom layer's downstream portion is less than the CeO2 content in a bottom coating layer's upstream portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.