Leached catalyst for ammonia synthesis
US4499204A · kind A · utility
10Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1984 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Jan 3, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved catalyst for the synthesis of ammonia is described wherein a promoted iron-derived, pre-reduced catalyst is oxidatively leached with a neutral aqueous solution of potassium cyanide. Preferably an organic carboxylic acid such as citric acid is added to the aqueous solution to maintain the pH at about neutral. The resulting leached catalyst has a markedly higher activity than the unleached catalyst. The leached catalyst may be contacted with a cobalt complex or a nickel salt to incorporate cobalt or nickel therein which catalysts are also useful for ammonia synthesis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.