Copper-silver zeolite catalysts in exhaust gas treatment
US5968466A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1996 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | May 28, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the removal of carbon monoxide, hydrocarbons, and nitrogen oxides in an oxidizing exhaust gas comprising contacting the exhaust gas with a catalyst comprising a crystalline zeolite having the following characteristics: PA1 a) a Si/Al atomic ratio between 5 and 100; PA1 b) a pore size in the range of from about 0.5 to about 1.3 nm; PA1 c) essentially no octahedral aluminum detectable by .sub.27 Al NMR spectroscopy; PA1 d) a sodium ion exchange capacity, with regard to total aluminum content, of greater than 75%; PA1 e) a copper content in the range of from about 0.5 wt. % to about 12 wt. %; and PA1 f) a silver content in the range of from about 0.25 wt. % to about 20 wt. %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.