Abstract
Gas-phase Beckmann rearrangement of cyclododecanone oxime (Cdox) to ω-laurolactam is reported for the first time on Al,B-MCM-41 catalysts. The Cdox conversion was studied by using a temperature programmed reaction experiment in the 325–450 °C temperature range employing 0.15 M Cdox in toluene/acetone solution. The oxime conversion increased gradually with reaction temperature from ca. 90% at 325 °C to ca. 95% at 450 °C, whereas the yield of the desired product ω-laurolactam decreased. The optimal reaction temperature was 375 °C, which balanced the conversion of Cdox, selectivity to ω-laurolactam and catalyst lifetime. In parallel, liquid-phase experiments were carried out under conventional heating. Weak and medium strength acid sites, higher strong acid B/L ratios and adequate pore diameter of untreated Al,B-MCM-41 materials favored an optimal performance for the gas-phase Beckmann rearrangement of Cdox, clearly improving the conversion, selectivity to ω-laurolactam and catalyst lifetime in gas-phase with respect to the conventional liquid-phase reactions.
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Acknowledgements
This research was subsidized by Grants from the Dirección General de Investigación (Projects CTQ2007-65754/PPQ, CTQ2008-01330), Ministerio de Ciencia y Tecnología, FEDER funds, and from the Consejería de Innovación, Ciencia y Empresa (Junta de Andalucía, Project P07-FQM-2695).
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Conesa, T.D., Luque, R., Campelo, J.M. et al. Gas-phase Beckmann rearrangement of cyclododecanone oxime on Al,B-MCM-41 mesoporous materials. J Mater Sci 44, 6741–6746 (2009). https://doi.org/10.1007/s10853-009-3601-x
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DOI: https://doi.org/10.1007/s10853-009-3601-x