Use of Short Time-on-Stream Attenuated Total Internal Reflection Infrared Spectroscopy To Probe Changes in Adsorption Geometry for Determination of Selectivity in the Hydrogenation of Citral

H. Daly, H. G. Manyar, R. Morgan, J. M. Thompson, J. J. Delgado, R. Burch, C. Hardacre*

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Abstract Image

A new experimental procedure based on attenuated total reflection infrared spectroscopy has been developed to investigate surface species under liquid phase reaction conditions. The technique has been tested by investigating the enhanced selectivity in the hydrogenation of α,β-unsaturated aldehyde citral over a 5% Pt/SiO2 catalyst toward unsaturated alcohols geraniol/nerol, which occurs when citronellal is added to the reaction. The change in selectivity is proposed to be the result of a change in the citral adsorption mode in the presence of citronellal. Short time on stream attenuated total internal reflection infrared spectroscopy has allowed identification of the adsorption modes of citral. With no citronellal, citral adsorbs through both the C═C and C═O groups; however, in the presence of citronellal, citral adsorption occurs through the C═O group only, which is proposed to be the cause of the altered reaction selectivity.
Original languageEnglish
Pages (from-to)2470-2478
Number of pages9
JournalACS Catalysis
Volume4
Issue number8
Early online date16 Jun 2014
DOIs
Publication statusPublished - Aug 2014

Keywords

  • Pt
  • ATR
  • infrared
  • citral
  • hydrogenation
  • SITU ATR-IR
  • LIQUID-PHASE HYDROGENATION
  • ALPHA,BETA-UNSATURATED ALDEHYDES
  • UNSATURATED ALDEHYDES
  • ASYMMETRIC HYDROGENATION
  • 1ST PRINCIPLES
  • PTSN CATALYSTS
  • BENZYL ALCOHOL
  • PD/AL2O3
  • OXIDATION

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