“Clean” limonene epoxidation using Ti-MCM-41 catalyst

• Published in: Applied catalysis. A, General General, 2005-06, Vol.287 (2), p.227-235
• Main Authors: Cagnoli, M.V., Casuscelli, S.G., Alvarez, A.M., Bengoa, J.F., Gallegos, N.G., Samaniego, N.M., Crivello, M.E., Ghione, G.E., Pérez, C.F., Herrero, E.R., Marchetti, S.G.
• Format: Article
• Language: English
• Subjects: Catalysis; Catalytic limonene epoxidation; Chemistry; Colloidal gels. Colloidal sols; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Limonene epoxidation kinetic; Porous materials; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Ti leaching; Ti-MCM-41 catalysts
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2005.04.001

The limonene oxidation with H 2O 2 (“clean” oxidation) using a Ti-MCM-41 catalyst was studied. This catalyst was synthesized by a sol–gel method and characterized by XRD, DRS, ICP and BET. The operative reaction conditions, under which no Ti leaching was detected, were determined. In these conditions the catalyst has shown a high activity, and very good selectivity towards epoxides. The kinetic parameter measurements were carried assuming a heterogeneous reaction and empirical power rate law. Using the initial rate method, a first order with respect to the concentrations of catalyst, limonene and hydrogen peroxide were determined. An apparent activation energy value of 16.4 kJ/mol and a pre-exponential Arrheniuśs factor of 7.1 l 2/g mol h were obtained.