Hydrogenation of acetylene over low loaded Pd and Pd-Au/SiO2 catalysts

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

Acetylene hydrogenation and formation of surface deposits have been investigated on two series of Pd and Pd-Au/SiO2 catalysts differing in metal particle size (D = 0.47 and 0.08). Gold was deposited via ionization of pre-adsorbed hydrogen over pre-reduced Pd/SiO2 in order to ensure selective poisoning of the Pd surface. The non-steady-state regime of operation and the accumulation of hydrocarbonaceous overlayer were tested in pulse-flow experiments. Concentration of surface hydrocarbonaceous deposits accumulated during different treatments was also determined by temperature programmed oxidation (TPO). Hydrocarbon overlayer was observed to form immediately and its presence appeared to be a necessary requisite to get steady-state conversion and selectivity data. A large excess of hydrogen suppressed the formation of carbonaceous laydown and increased the over-hydrogenation of acetylene. Presence of Au decreased the carbon coverage and improved the ethene selectivity. Decoration of Pd by Au and the morphology of particles explain the ethene selectivity improvement.

Original languageEnglish
Pages (from-to)117-125
Number of pages9
JournalApplied Catalysis A: General
Volume229
Issue number1-2
DOIs
Publication statusPublished - Apr 10 2002

Fingerprint

Acetylene
Hydrogenation
Catalysts
Hydrogen
Deposits
Hydrocarbons
Gold
Ionization
Carbon
Metals
Particle size
Oxidation
Experiments
Temperature
ethylene

Keywords

  • Acetylene hydrogenation
  • Bimetallic catalyst
  • Carbonaceous materials
  • Hydrocarbon coverage
  • Pd-Au
  • Pulse-flow experiments

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Hydrogenation of acetylene over low loaded Pd and Pd-Au/SiO2 catalysts. / Sárkány, A.; Horváth, A.; Beck, A.

In: Applied Catalysis A: General, Vol. 229, No. 1-2, 10.04.2002, p. 117-125.

Research output: Contribution to journalArticle

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N2 - Acetylene hydrogenation and formation of surface deposits have been investigated on two series of Pd and Pd-Au/SiO2 catalysts differing in metal particle size (D = 0.47 and 0.08). Gold was deposited via ionization of pre-adsorbed hydrogen over pre-reduced Pd/SiO2 in order to ensure selective poisoning of the Pd surface. The non-steady-state regime of operation and the accumulation of hydrocarbonaceous overlayer were tested in pulse-flow experiments. Concentration of surface hydrocarbonaceous deposits accumulated during different treatments was also determined by temperature programmed oxidation (TPO). Hydrocarbon overlayer was observed to form immediately and its presence appeared to be a necessary requisite to get steady-state conversion and selectivity data. A large excess of hydrogen suppressed the formation of carbonaceous laydown and increased the over-hydrogenation of acetylene. Presence of Au decreased the carbon coverage and improved the ethene selectivity. Decoration of Pd by Au and the morphology of particles explain the ethene selectivity improvement.

AB - Acetylene hydrogenation and formation of surface deposits have been investigated on two series of Pd and Pd-Au/SiO2 catalysts differing in metal particle size (D = 0.47 and 0.08). Gold was deposited via ionization of pre-adsorbed hydrogen over pre-reduced Pd/SiO2 in order to ensure selective poisoning of the Pd surface. The non-steady-state regime of operation and the accumulation of hydrocarbonaceous overlayer were tested in pulse-flow experiments. Concentration of surface hydrocarbonaceous deposits accumulated during different treatments was also determined by temperature programmed oxidation (TPO). Hydrocarbon overlayer was observed to form immediately and its presence appeared to be a necessary requisite to get steady-state conversion and selectivity data. A large excess of hydrogen suppressed the formation of carbonaceous laydown and increased the over-hydrogenation of acetylene. Presence of Au decreased the carbon coverage and improved the ethene selectivity. Decoration of Pd by Au and the morphology of particles explain the ethene selectivity improvement.

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