Synthesis of 3-fluorobenzaldehyde by gas-phase selective oxidation on Fe–Mo oxide/boralite catalysts
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The gas-phase selective synthesis of 3-fluorobenzaldehyde from 3-fluorotoluene over bulk iron molybdate and Fe–Mo oxide in a host boralite sample is described. The latter samples, prepared by adding Fe and Mo by chemical vapor deposition to the boralite, show high selectivity in oxidation, making yields of 3-fluorobenzaldehyde of over 40% possible. The pretreatment of the zeolite to eliminate extra-framework boron improves behavior, and secondary post-addition of molybdenum by CVD to increase the Mo/Fe ratio in the catalyst has a similar enhancing effect. The behavior of Fe–Mo/boralite samples proves significantly better, in terms of both specific activity (per mass of active phase) and selectivity, than bulk Fe2(MoO4)3, but at high conversion lower selectivities are found probably due to the presence of limitations in the backdiffusion of 3-fluorobenzaldehyde.
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- Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd Ed.,Vol. 17 (Wiley, New York 1982) p. 749.Google Scholar
- G. Centi, F. Cavani and F. Trifirò, Selective Oxidation by Heterogeneous Catalysis, Recent Developments, Series Fundamental and Applied Catalysis (Plenum, New York, 1999).Google Scholar
- G. Centi, F. Fazzini, L. Canesson and A. Tuel, in: 3rd World Congress on Oxidation Catalysis, Stud. Surf. Sci. Catal., Vol. 110, eds. R.K. Grasselli, S.T. Oyama, A.M. Gaffney and J.E. Lyons (Elsevier, Amsterdam, 1997) p. 893.Google Scholar
- G. Centi, F. Fazzini, J.L.G. Fierro, M. Lopez Granados, R. Sanz and D. Serrano, Preparation of Catalysts VII, Stud. Surf. Sci. Catal., Vol. 118, eds. B. Delmon, P.A. Jacobs, R. Maggi, J.A. Martens, P. Grange and G. Poncelet (Elsevier, Amsterdam, 1998) pp. 577–591.Google Scholar