Formation of C4 oligomers in hydrogenation of acetylene over Pd/Al2O3 and Pd/TiO2 catalysts

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Abstract

Selectivity of product formation has been tested in hydrogenation of acetylene over 0.3 wt.% Pd/α-alumina and 0.5 wt.% Pd/TiO2 catalysts. Non-steady-state regime of catalyst operation was tested in pulse-flow experiments. Significant carbon poisoning appears to be a necessary requisite for selective formation of ethylene. The effect of hydrogen and acetylene partial pressure has been tested on the selectivity of C4 products. At 273-298 K the catalysts showed 26-35% selectivity for C4 hydrocarbons and <2.5% for ethane production at conversions of 30-40%. Deuterium distribution in ethylene and 1,3-butadiene and the deuterium content of the surface hydrogen pool have been compared and mechanism of diene formation has been discussed.

Original languageEnglish
Pages (from-to)299-307
Number of pages9
JournalReaction Kinetics and Catalysis Letters
Volume74
Issue number2
DOIs
Publication statusPublished - Dec 1 2001

Keywords

  • Acetylene
  • C oligomers
  • Deuterium
  • Pd catalyst
  • Semi-hydrogenation

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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