Exhaust gas purifying catalyst and method for producing the same
US10189011B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2017 |
| Grant date | Jan 29, 2019 |
| Priority date | — |
| Expiry date | Sep 12, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas purifying catalyst with an excellent effect of suppressing deterioration due to aggregation of a noble metal catalyst during endurance at high temperature, and a production method therefor. The method for producing the exhaust gas purifying catalyst that has a porous carrier and a noble metal catalyst supported thereon includes: preparing the porous carrier that contains alumina-ceria-zirconia composite oxide particles and has physical property values, after subjected to baking at 900° C. for 5 hours, of a pore diameter of the particles in the range of 2 to 20 nm, a specific surface area of the particles in the range of 75 to 115 m2/g, a crystallite size of a ceria-zirconia composite oxide contained in the particles in the range of 4 to 6 nm, and a bulk density of the particles in the range of 0.5 to 0.9 cm3/g, and bringing a noble metal chemical solution having an aggregate of platinum or the like with a grain size adjusted to less than or equal to 1 nm with the use of a platinum nitric acid solution or the like, into contact with the porous carrier, so that the noble metal catalyst is supported on the porous carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.