Liquid phase hydrogenatin of crotonaldehyde over Pt/SiO2 catalysts

M. Englisch, Martin Englisch, V. Ranade, J.A. Lercher

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Abstract

The dependence of the catalytic properties of Pt/SiO2 catalysts for the hydrogenation of crotonaldehyde on the hydrogen pressure, the reaction temperature, the nature of the solvent and the presence of several additives were investigated. Strong deactivation of the catalysts mainly caused by decarbonylation of crotonaldehyde and irreversible adsorption of CO was observed. The initial activity of the deactivated catalysts is regained by oxidation of the adsorbed CO to CO2 by purging with air. The selectivity to crotylalcohol increased with increasing number of turnovers per metal site. This is explained with preferential blocking of the nonselective sites on the metal crystallites by CO and by a slow surface modification of the aging catalyst with organic deposits. The overall rate and the selectivity to the saturated aldehyde are markedly enhanced by an increase in hydrogen pressure and by a decrease in reaction temperature. The addition of modifiers such as potassium acetate, triphenylphosphine and thiophene had only little influence on the activity and the selectivity of the catalysts.
Original languageUndefined
Pages (from-to)111-122
Number of pages12
JournalApplied catalysis A: general
Volume163
Issue number163
DOIs
Publication statusPublished - 1997

Keywords

  • IR-10192
  • METIS-105539

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