In a series of combined adsorption, reactivity and spectroscopic experiments in solution with ketones of different size and shape, the fundamental role of the hydroxylamine pathway in the cyclohexanone ammoximation is established. In presence of H2O2 and NH3, framework Ti(IV) forms octahedrally distorted aquo-hydroperoxo and ammonia-hydroperoxo mixed complexes: the latter one being the precursor of the hydroxylamine formation. This intermediate immediately reacts with cyclohexanone in the channels or diffuses to the external solution where it gives oximation reaction with larger ketones which could not penetrate the channels.

Ammoximation of Cyclohexanone on Titanium Silicalite - Investigation of the Reaction-Mechanism

ZECCHINA, Adriano;SPOTO, Giuseppe;BORDIGA, Silvia;
1993-01-01

Abstract

In a series of combined adsorption, reactivity and spectroscopic experiments in solution with ketones of different size and shape, the fundamental role of the hydroxylamine pathway in the cyclohexanone ammoximation is established. In presence of H2O2 and NH3, framework Ti(IV) forms octahedrally distorted aquo-hydroperoxo and ammonia-hydroperoxo mixed complexes: the latter one being the precursor of the hydroxylamine formation. This intermediate immediately reacts with cyclohexanone in the channels or diffuses to the external solution where it gives oximation reaction with larger ketones which could not penetrate the channels.
1993
75
719
729
HYDROGEN-PEROXIDE
Adriano Zecchina; Giuseppe Spoto; Silvia Bordiga; Francesco Geobaldo; Guido Petrini; G. Leofanti; M. Padovan; M. Mantegazza; P. Roffia; S. Kaliaguine; H.L. Krauss; S. Sivasanker
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/115575
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