Phosphorus/vanadium maleic anhydride catalyst preparation
US6107234A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1999 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Jan 29, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2523/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A VPO catalyst precursor having the formula (VO)HPO.sub.4 aH.sub.2 OM.sub.m P.sub.p O.sub.y wherein M is at least one promoter element selected from the group consisting of elements from Groups IA, IB, IIA, IIIA, IIIB, IVA, IVB, VA, VB, VIA, VIB, and VIIIA of the Periodic Table of the Elements, and mixtures thereof, a is a number of at least about 0.3, m is a number of from about 0 to about 0.3, p is a number of from about 0 to about 0.3, any y corresponds to the amount of oxygen necessary to satisfy the valence requirements of all elements present, is activated by heating the catalyst precursor in an atmosphere selected from the group consisting of air, steam, inert gas, and mixtures thereof to a temperature not to exceed about 300.degree. C., maintaining the catalyst precursor at this temperature and providing an atmosphere containing molecular oxygen, steam, and optionally an inert gas, increasing the temperature at a programmed rate of from about 0.5.degree. C./min to about 15.degree. C./min to a value effective to eliminate the water of hydration from the catalyst precursor, adjusting the temperature to a value greater than 350.degree. C., but less than 550.degree. C., and mai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.