Exhaust gas purification catalyst, method of producing the same, and exhaust gas purification method using the same
US9475003B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2015 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Jun 1, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas purification catalyst includes an alumina support, a silica layer, and active metal particles. The silica layer is formed on a surface of the alumina support. The active metal particles are formed of platinum and palladium, the platinum and the palladium being supported on the silica layer. A ratio of fine particles having a particle size of 2.0 nm or less to all the active metal particles is 50% or higher in terms of the number of particles, the fine particles being included in the active metal particles. A ratio of fine alloy particles having a palladium content ratio of 10 at % to 90 at % to all the fine particles is 50% or higher in terms of the number of particles, the fine alloy particles being included in the fine particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.