Vanadium catalysts prepared with phosphonates
US4013586A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1975 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | Jul 24, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J27/198
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved process was found for preparing a vanadium-containing catalyst wherein a tetravalent vanadium compound is provided from a pentavalent vanadium compound, comprising contacting the pentavalent vanadium compound with a phosphonate. The improved process is exemplified by the preparation of phosphorus-vanadium-oxygen catalysts, and particularly the preparation of phosphorus-vanadium-oxygen catalysts having a phosphorus to vanadium atom ratio of about 1:2 to about 2:1 comprising contacting a vanadium compound with a selected phosphonate, recovering a phosphorus-vanadium-oxygen precursor, and thereafter calcining the precursor to form the catalysts. The compound 1-hydroxy-1,1-ethylidene diphosphonic acid is preferred as the phosphonate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.