Catalyst for purifying exhaust gases, a method of producing the same, and a method of purifying exhaust gases
US6440378B1 · kind B1 · utility
18Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Jun 16, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/514
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A noble metal composite colloid composed of a plurality of noble metals is constructed to be loaded on a porous oxide support. The noble metals are loaded in particles which are larger than the conventional grains in the atomic state. Thus, vapor pressure decreases and volatile components, such as PtO2, are suppressed from dislocation or diffusion. In addition, affinity of the noble metals with the support is improved, and are suppressed from moving on the support. Thus, nobel metal grain growth is suppressed, decreases in catalytic activity is minimized and durability is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.