Some features of acetylene hydrogenation on Au-iron oxide catalyst

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Abstract

Hydrogenation of acetylene has been investigated on Au-iron oxide catalysts containing 4.5,3.0, 5.6 wt% Au prepared by deposition-precipitation (DP) with urea, adsorption of Au sol (SA) and by co-precipitation (CP) of HAuCU and Fe(NO3)3, respectively. The latter method produced Au particles supported on 2-line ferrihydrite (Fe5HO84H 2O). Au/iron oxide catalyst precursors (Au/α-Fe 2O3 and Au/2-line ferrihydrite) were characterized by BET, TGA, TPR and XRD, and the Au particle size by TEM measurements. The TPR measurements confirm the ease of transformation of 2-line ferrihydrite to magnetite (Fe3O4) and that the formation of magnetite from α-Fe2O3 depends strongly on the size of the gold and the supporting oxide particles. Particle size effect of gold has been investigated in semi-hydrogenation of acetylene. Temperature of hydrogen treatment has been observed to play a crucial role in the activity and ethylene selectivity. AuZFeOx samples hydrogen treated at 353-473 K prior to introduction of the reactants (H2:C2H2-140, 0.11% C2H2) show very limited over-hydrogenation (ethane formation is less than =1% and 2-4% selectivity of oligomer (C4+) formation at 353-473 K. Hydrogen treatment of the samples at T> 573 K but lower than the wüstite (FeO) stability point (=843 K) resulted in partial reduction of Fe3O4 and formation of Fe0. The shift of Au(111) XRD line to higher 2

Original languageEnglish
Pages (from-to)133-141
Number of pages9
JournalApplied Catalysis A: General
Volume380
Issue number1-2
DOIs
Publication statusPublished - May 31 2010

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Keywords

  • Acetylene hydrogenation
  • Au particle size
  • Au-iron oxide
  • Ferrihydrite
  • Selectivity

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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