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Hydrogenation of citral over pt and pt-fe/sio2 catalysts

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Summary

Pt/SiO2 and Pt-Fe/SiO2 catalysts having a Pt loading ranging from 0.5 to 3.0 wt.% and a fixed amount of Fe in the bimetallic series, 1.0 wt.% have been prepared by the impregnation procedure, followed by calcinations and reduction in H2 flow at 773 K. The samples were characterized by N2 adsorption at 77 K, H2 chemisorption at 298 K, TEM, TPR and XPS. The hydrogenation of citral at 363 K and 8.3 bar over a series of  Pt/SiO2 and Pt-Fe/SiO2 catalysts was studied. Thus, the selectivity towards the unsaturated alcohol (geraniol + nerol) decreases at high loads of monometallic Pt. An effect of polarization of the C=O bond  due to the presence of Fe3+ species leads to catalysts active and highly selective to the hydrogenation of the carbonyl bond. Characterization results showed that Pt is present as Pto and Fe mainly asFe3+.

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Authors and Affiliations

  1. Departamento de Física-Química, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 160-C, Concepción, Chile

    Patricio Reyes

  2. Escuela de Química, Facultad de Ciencias, Grupo de Catálisis (GC-UPTC), Universidad Pedagógica y Tecnológica de Colombia, Tunja, Colombia

    and Hugo Rojas

Authors
  1. Patricio Reyes
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  2. and Hugo Rojas
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Reyes, P., Rojas, a. Hydrogenation of citral over pt and pt-fe/sio2 catalysts. React Kinet Catal Lett 88, 363–369 (2006). https://doi.org/10.1007/s11144-006-0073-8

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  • DOI: https://doi.org/10.1007/s11144-006-0073-8

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