Process for making bismuth-vanadium-molybdenum-containing compositions
US5443810A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1991 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Apr 24, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a process for making a bismuth-vanadium-molybdenum-containing composition comprising: (A) preparing three separate aqueous compositions comprising: a first aqueous composition having a pH in the range of about 0.5 to about 4; a second aqueous composition comprising bismuth and having a pH in the range of about 0.2 to about 3; and a third aqueous composition comprising at least one salt of vanadium and at least one salt of molybdenum and having a pH in the range of about 9 to about 14; (B) adding said second aqueous composition and said third aqueous composition simultaneously to said first aqueous composition to form a fourth aqueous composition, and maintaining said fourth aqueous composition at a temperature in the range of about 30.degree.C. to about 90.degree.C. for up to about 4 hours, said fourth aqueous composition comprising precipitated solids; (C) separating said solids from said fourth aqueous composition; and (D) heating said solids at a temperature in the range of about 250.degree.C. to about 675.degree.C. for about 0.5 to about 30 hours to provide said bismuth-vanadtum-molybdenum-containing composition. This invention also relates to bismuth-…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.