Ammoximation of cyclohexanone and hydroxyaromatic ketones over titanium molecular sieves

The liquid phase ammoximation of cyclohexanone, ortho and para-hydroxyacetophenones (2-HAP and 4-HAP) with ammonia and hydrogen peroxide was investigated over titanium-silicalite-1 (TS-1), titanium-aluminum-beta (TiAl-Beta) and Ti-ZSM-48. The ammoximation of 4-HAP over TS-1 gave the corresponding o...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. A, General General, 1996-01, Vol.136 (1), p.69-80
Main Authors: Le Bars, J., Dakka, J., Sheldon, R.A.
Format: Article
Language:English
Subjects:
Ammoximation
Cyclohexanone
Hydrogen peroxide
Hydroxyacetophenones
Oximes
Titanium silicates
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The liquid phase ammoximation of cyclohexanone, ortho and para-hydroxyacetophenones (2-HAP and 4-HAP) with ammonia and hydrogen peroxide was investigated over titanium-silicalite-1 (TS-1), titanium-aluminum-beta (TiAl-Beta) and Ti-ZSM-48. The ammoximation of 4-HAP over TS-1 gave the corresponding oxime in 100% selectivity at 50% 4-HAP conversion. Under similar conditions, TiAl-Beta gave the oxime in 80% selectivity at 30% 4-HAP conversion. Ti-ZSM-48 afforded 17% 4-HAP conversion and 67% 4-HAP oxime selectivity. The ammoximation of 2-HAP occurred with 80% yield over TS-1 and with 40% yield over TiAl-Beta. Methanol as solvent and large excess of ammonia are preferred to perform ammoximation on TiAl-Beta.
ISSN:0926-860X
1873-3875
DOI:10.1016/0926-860X(95)00264-2