Exhaust gas purification catalyst
US10413895B2 · kind B2 · utility
0Cited by
8References
12Claims
0Family size
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Key dates
| Filing date | Mar 24, 2016 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Apr 18, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
When the amount of coating is increased in a two-layer catalyst or the like containing two noble metals in respective different layers, gas diffusivity in the catalyst and use efficiency of a catalytic active site are reduced to thereby reduce purification performance. In view of this, an organic fiber having a predetermined shape is used as a pore-forming material in formation of an uppermost catalyst coating layer of a multi-layer catalyst, to thereby form an uppermost catalyst coating layer having a high-aspect-ratio pore excellent in connectivity and therefore excellent gas diffusivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.