Process for preparing a catalyst for the oxidation of methanol to formaldehyde
US3983073A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1975 |
| Grant date | Sep 28, 1976 |
| Priority date | — |
| Expiry date | Jul 10, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C45/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A catalyst active in the oxidation of methanol to formaldehyde is prepared by forming a suspension of an amorphous precipitate by mixing an aqueous molybdate solution with an aqueous solution of a ferric salt, while maintaining an atomic ratio Mo/Fe of at least 1.5:1 in the mixture, heating the suspension at 70.degree.-100.degree.C for at least 30 minutes, washing the resulting precipitate with water to remove the soluble salts and at least a part of the excess of soluble molybdate not transformed into iron molybdate, thereby to ensure in the washed solid an atomic ratio Mo/Fe of from 1.5:1 to 1.7:1, and drying the washed solid at a temperature not exceeding 120.degree.C for a period of at least 30 minutes. The catalyst consists of iron molybdate Fe.sub.2 (MoO.sub.4).sub.3 with an amount of free molybdenum trioxide ranging from zero to a value such that the atomic ratio Mo/Fe is from 1.5:1 to 1.7:1, and has a crystallinity degree of at least 90%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.