Catalysts selective for the reduction of nitrogen oxides to nitrogen in an oxidizing medium, a process for their preparation and their use
US5801114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Jan 11, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst which is active and selective for the reduction of nitrogen oxides to molecular nitrogen by reducing agents in a medium which is superstoichiometric in oxidizing agents such as carbon monoxide, hydrogen, hydrocarbons, alcohols and other oxygen-containing organic compounds. The active phase of this catalyst is as follows: PA0 at least one inorganic refractory oxide; PA0 at least one rare earth element (A); PA0 at least one alkaline-earth element (B); PA0 at least one platinum group metal (C); and PA0 at least one silver or gold metal (D). Impregnation of (C) is advantageously followed by heat treatment in a reducing atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.