Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Phosphorus or compound containing same
Reexamination Certificate
2005-06-07
2005-06-07
Bell, Mark L. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Phosphorus or compound containing same
C502S210000, C502S211000, C502S212000, C502S213000, C502S214000, C502S305000, C502S308000, C502S309000, C502S310000, C502S311000, C502S312000, C502S313000, C502S314000, C502S315000, C502S316000
Reexamination Certificate
active
06903047
ABSTRACT:
The present invention concerns a method for enhancing the activity of vanadium phosphorus oxide (VPO) catalysts. Promoter reagents are grafted onto or reacted with the catalyst surface. An optional calcination and activation heating cycle transforms the catalyst precursor into a final active phase. A preferred VPO catalyst produced has a ratio of molybdenum to vanadium on the surface of the catalyst to molybdenum to vanadium in the overall bulk of the catalyst represented by the equation (Mo/V) Surface≧1.10 (Mo/V) overall bulk.
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Gai Pratibha Laxman
Kourtakis Kostantinos
Bell Mark L.
E.I. du Pont de Nemours and Company
Hailey Patricia L.
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