Exhaust gas purification catalyst, exhaust gas purification monolith catalyst, and method for producing exhaust gas purification catalyst
US9352301B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2013 |
| Grant date | May 31, 2016 |
| Priority date | — |
| Expiry date | Jul 18, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2523/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas purification catalyst contains a first catalyst in which an oxide of general formula (1): LaxM1-xM′O3-δ (where La is lanthanum, M is at least one selected from a group consisting of barium (Ba), strontium (Sr) and calcium (Ca), M′ is at least one selected from a group consisting of iron (Fe), cobalt (Co), nickel (Ni) and manganese (Mn), δ is the amount of oxygen defect, and x and δ satisfy 0<x≦1 and 0≦δ≦1) is supported by an oxide capable of occluding and releasing oxygen, and a second catalyst containing a noble metal. The particle size of the oxide capable of occluding and releasing oxygen is within the range from 1 to 50 nm. The particle size of the oxide of the general formula (1) is within the range from 1 to 30 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.