J. Lebars et al., AMMOXIMATION OF CYCLOHEXANONE AND HYDROXYAROMATIC KETONES OVER TITANIUM MOLECULAR, Applied catalysis. A, General, 136(1), 1996, pp. 69-80
The liquid phase ammoximation of cyclohexanone, ortho and para-hydroxy
acetophenones (2-HAP and 4-HAP) with ammonia and hydrogen peroxide was
investigated over titanium-silicalite-1 (TS-1), titanium-aluminum-bet
a (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 8
0% yield over TS-1 and with 40% yield over Ti-AI-Beta. Methanol as sol
vent and large excess of ammonia are preferred to perform ammoximation
on Ti-Al-Beta.