Selective catalytic reduction of nitrogen oxides using an iron impregnated zeolite catalyst
US5451387A · kind A · utility
24Cited by
10References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Jul 7, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2255/50
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas treatment process useful for the removal of nitrogen oxides using an iron containing zeolite as the catalyst and ammonia as a reducing agent. It is desired to extend the effective temperature range for the selective catalytic reduction (SCR) of nitrogen oxides below about 400.degree. C. This is accomplished in the instant invention through the use of an intermediate pore size zeolite, such as ZSM-5, based catalyst which has been treated to incorporate iron into its pores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.