Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Phosphorus or compound containing same
Patent
1999-01-29
2000-08-22
Bell, Mark L.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Phosphorus or compound containing same
502210, 502211, 502212, B01J 27198, B01J 27188, B01J 2719, B01J 27192
Patent
active
061072346
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 maintaining the adjusted temperature in a molecular oxygen/steam-containing atmosphere comprised of at least 1 vol % oxygen for a time effective to provide a vanadium oxidation state of from about +4.0 to about +4.5 and to complete transformation of the precursor to the active catalyst having the Formula (VO).sub.2 P.sub.2 O.sub.7 M.sub.2m P.sub.2p O.sub.y wherein M, m, p and y are defined above.
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Bell Mark L.
Hailey Patricia L.
Long William C.
Scientific Design Company, Inc.
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