Catalyst comprising iridium, alkaline metal, alkaline earth or rare earth metal, and metal carbide or metal nitride
US5821190A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | May 17, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a catalyst and method for purifying exhaust gases, having superior performance of NOx purification to exhaust gases containing oxygen and nitrogen oxides, particularly superior performance of NOx elimination to exhaust gases from lean-bum engines with excess oxygen, and a wider effective temperature range of NOx elimination, and also superior heat resistance at high temperature, said catalyst for purifying exhaust gases comprises, as indispensable contents, iridium and alkaline metal loaded on a carrier which is at least one selected from metal carbide and metal nitride, or these and at least one element selected from the group consisting of alkaline earth metal elements and rare earth metal elements, and said method using these catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.