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Hydrogenation of Citral Over IrAu/TiO2 Catalysts. Effect of the Preparation Method

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Abstract

Hydrogenation of citral over Ir/TiO2 and IrAu/TiO2 catalysts was studied. Catalysts were prepared by deposition–precipitation with urea (Ir/TiO2) and sequential incorporation of the metals using a combined DPU-incipient wetness impregnation approach (IrAu/TiO2). Samples were reduced in H2 at 573 K (LT) and 773 K (HT). These materials were characterized by transmission electron microscopy (HAADF), TPR and CO adsorption followed by DRIFT. The liquid phase hydrogenation of citral was studied in a Parr type batch reactor at 363 K and a H2 pressure of 0.62 MPa. An Ir/TiO2 catalyst prepared by wet impregnation was used as reference catalyst. High selectivity to unsaturated alcohols was found, the only reaction products were geraniol and nerol for Ir/TiO2 DPU and IrAu/TiO2 catalysts. The IrAu/TiO2 (HT) catalyst showed the higher conversion levels.

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Acknowledgments

DGAPA IN-117706 and CONACYT 42666-F projects which infrastructure was used in this work. Technical support for TEM images obtained in the LCM-IF. The authors are grateful to International Relationships Office and DIN––UPTC and in UNAM through the Institutional Cooperation Agreement UNAM––UPTC No. 17139-1181-1-IX-05.

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Authors and Affiliations

  1. Instituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Cd. Universitaria, 04510, México, D.F, México

    Gabriela Díaz, Antonio Gómez-Cortés & Orlando Hernández-Cristobal

  2. Grupo de Catálisis, Escuela de Ciencias Químicas, Universidad Pedagógica y Tecnológica de Colombia UPTC, Avenida Central del Norte, Vía Paipa, Tunja, Boyacá, Colombia

    Julie J. Murcia, Gloria Borda & Hugo Rojas

Authors
  1. Gabriela Díaz
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  2. Antonio Gómez-Cortés
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  3. Orlando Hernández-Cristobal
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  4. Julie J. Murcia
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  5. Gloria Borda
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  6. Hugo Rojas
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Corresponding authors

Correspondence to Gabriela Díaz or Hugo Rojas.

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Díaz, G., Gómez-Cortés, A., Hernández-Cristobal, O. et al. Hydrogenation of Citral Over IrAu/TiO2 Catalysts. Effect of the Preparation Method. Top Catal 54, 467–473 (2011). https://doi.org/10.1007/s11244-011-9609-x

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  • DOI: https://doi.org/10.1007/s11244-011-9609-x

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