Catalyst regeneration with impregnation of bismuth and molybdenum
US4052332A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1976 |
| Grant date | Oct 4, 1977 |
| Priority date | — |
| Expiry date | Apr 20, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Process for regenerating a spent catalyst, which catalyst contains potassium, cobalt, nickel, iron, bismuth, phosphorus and molybdenum and sufficient oxygen to satisfy the valence of the other elements therein, on a support, e.g. silicon oxide, wherein at least a portion of the molybdenum has been lost during ammoxidation, comprising impregnating said catalyst with bismuth and molybdenum in solution so that at least some of the molybdenum lost is replaced, e.g., a typical impregnating solution is prepared by dissolving molybdenum trioxide and phosphoric acid in water, adding nitric acid and finally dissolving bismuth nitrate pentahydrate in the resultant solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.