Exhaust gas purifying catalyst
US10322406B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 11, 2015 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Mar 5, 2036 |
Classification
- Technology area (CPC —)General
Abstract
The object of the present invention is to provide an exhaust gas purifying catalyst that can achieve high purification performance while suppressing H2S emissions. The object is solved by an exhaust gas purifying catalyst in which the top layer of a catalyst coating layer comprises a ceria-zirconia composite oxide having a pyrochlore-type ordered array structure, in which the ceria-zirconia composite oxide contains at least one additional element selected from the group consisting of praseodymium, lanthanum, and yttrium at 0.5 to 5.0 mol % in relation to the total cation amount, and the molar ratio of (cerium+additional element):(zirconium) is within the range from 43:57 to 48:52.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.