Catalysis Letters

, Volume 18, Issue 1–2, pp 99–109 | Cite as

Activity and selectivity of PtNi/TiO2 catalysts for hydrogenation of crotonaldehyde

  • Christian G. Raab
  • Johannes A. Lercher
Article

Abstract

The hydrogenation of crotonaldehyde over a series of titania supported PtNi catalysts was investigated. Pt/TiO2 had the highest activity to hydrogenate the\(C = O\) bond of crotonaldehyde. With the addition of Ni to Pt the activity for carbonyl group hydrogenation decreased, while that for the\(C = C\) bond hydrogenation increased. Two different types of sites were established to be active for\(C = O\) bond hydrogenation, located at (i) the Pt-TiO2 interface and (ii) the PtNi bimetallic phase. For the Pt-TiO2 interface the presence of accessible Ti x+ cations in close distance to Pt and for the PtNi phase a slightly positively charged Ni on the surface of these alloy particles were concluded to be responsible for the enhanced selectivity to crotylalcohol. The hydrogenation of the\(C = C\) bond occurs mainly on the “clean” metal surfaces of Ni and Pt.

Keywords

Selective hydrogenation PtNi/TiO2 bimetallic catalysts 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1993

Authors and Affiliations

  • Christian G. Raab
    • 1
  • Johannes A. Lercher
    • 1
  1. 1.Institut für Physikalische Chemie and Christian Doppler Laboratorium für Heterogene KatalyseTechnische Universität WienViennaAustria

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