Process for producing catalysts and impregnating solutions and catalysts produced by the process
US5116798A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1991 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Mar 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/79
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst which contains vanadium oxide and alkali compounds and serves to oxidize SO.sub.2 to SO.sub.3 is produced in that prefabricated carrier bodies are impregnated with impregnating solutions which contain vanadium and alkalis, the impregnated carrier bodies are thermally treated at elevated temperature and this is followed by an activation under oxidizing conditions at a temperature from 750.degree. C. to 1000.degree. C. In the production of the impregnating solutions, fine-grained V.sub.2 O.sub.5 is dissolved in an acid aqueous medium with addition of a reducing agent and a reduction to form VO.sup.2+ is effected, acid and reducing agent are used in approximately stoichiometric amounts for the dissolution and reduction of V.sub.2 O.sub.5. The alkalis are used in the form of salts. The solution is adjusted to contain SO.sub.4 in an amount which is sufficient to combine the entire amount of the alkalis in neutral sulfates during the drying and activation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.