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Liquid-Phase Hydrogenation of Unsaturated Aldehydes: Enhancing Selectivity of Multiwalled Carbon Nanotube-Supported Catalysts by Thermal Activation

  1. Bruno F. Machado Dr.1,
  2. Helder T. Gomes Dr.1,2,
  3. Philippe Serp Prof.3,
  4. Philippe Kalck Prof.3,
  5. Joaquim L. Faria Prof.1

Article first published online: 20 JAN 2010

DOI: 10.1002/cctc.200900230

Issue

ChemCatChem

ChemCatChem

Volume 2, Issue 2, pages 190–197, February 8, 2010

Additional Information

How to Cite

Machado, Bruno F., Gomes, Helder T., Serp, P., Kalck, P. and Faria, Joaquim L. (2010), Liquid-Phase Hydrogenation of Unsaturated Aldehydes: Enhancing Selectivity of Multiwalled Carbon Nanotube-Supported Catalysts by Thermal Activation. ChemCatChem, 2: 190–197. doi: 10.1002/cctc.200900230

Author Information

  1. 1

    Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto (Portugal), Fax: (+351) 225-081-449

  2. 2

    Departamento de Tecnologia Química e Biológica, Escola Superior de Tecnologia e de Gestão, Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-857 Bragança (Portugal)

  3. 3

    Laboratoire de Chimie de Coordination UPR CNRS 8241, Composante ENSIACET, Toulouse University, 118 Route de Narbonne, 31077 Toulouse Cedex 4 (France)

Publication History

  1. Issue published online: 1 FEB 2010
  2. Article first published online: 20 JAN 2010
  3. Manuscript Revised: 27 OCT 2009
  4. Manuscript Received: 4 SEP 2009

Funded by

  • Fundação para a Ciência e a Tecnologia (FCT
  • Programa Operacional
  • FEDER

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Keywords:

  • aldehydes;
  • hydrogenation;
  • nanotubes;
  • supported catalysts;
  • surface chemistry

Abstract

Platinum and iridium organometallic precursors are used to prepare nanosized, thermally stable multiwalled carbon nanotube-supported catalysts. The materials are characterized by N2 adsorption at 77 K, temperature-programmed desorption coupled with mass spectrometry, H2 chemisorption, transmission electron microscopy and thermogravimetric analysis; they are tested in the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol under mild conditions (363 K and 1 MPa). A thermal activation at 973 K is found to have a very positive effect over both activity and selectivity, leading to selectivities of approximately 70 %, at 50 % conversion, regardless of the active metal phase (Pt or Ir). Since no noticeable differences in the metal particle sizes are detected, the results are interpreted in light of an enhanced metal/support interaction. This effect, induced by the removal of oxygenated surface groups, is thought to change the adsorption mechanism of the cinnamaldehyde molecule.

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