Zeolite having copper and alkali earth metal supported thereon
US8795626B2 · kind B2 · utility
2Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2011 |
| Grant date | Aug 5, 2014 |
| Priority date | — |
| Expiry date | Dec 27, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A chabazite-type zeolite having copper and an alkali earth metal supported thereon. The alkali earth metal is preferably at least one metal selected from the group consisting of calcium, magnesium and barium. Moreover, the SiO2/Al2O3 molar ratio is preferably from 10 to 50, and the copper/aluminum atomic ratio is preferably from 0.15 to 0.25. This type of chabazite-type zeolite exhibits a higher nitrogen oxide purification rate after a hydrothermal durability treatment than those of conventional chabazite-type zeolite catalysts on which only copper is supported.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.