Catalyst for purifying nitrogen oxides from exhaust and waste gases
US5550096A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1995 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Feb 9, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2255/9207
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst for the purification of an exhaust gas by the removal, through selective reduction, of nitrogen oxides present in the exhaust gas, which comprises (A) 80 to 95% by weight of a sulfur oxide-containing catalytic oxide obtained by thermally treating at least one hydrous oxide compound selected from the group consisting of binary hydrous oxide compound of titanium and silicon, binary hydrous oxide compound of titanium and zirconium and ternary hydrous oxide compound of titanium, zirconium and silicon in the presence of at least one sulfur compound selected from the group consisting of sulfuric acid and ammonium sulfate, (B) 0 to 5% by weight of a catalytic oxide comprising vanadium oxide, (C) 1 to 15% by weight of a catlytic oxide comprising the oxide of at least one metal selected form the group consisitng of tungsten, molybdenum, tin and cerium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.