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  • 1 Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
  • | 2 Institut de Recherches sur la Catalyse et l'Environnement de Lyon, UMR 5256 CNRS/Université Lyon, 2 Avenue Albert Einstein, 69626, Villeurbanne cedex, France
  • | 3 SCG Chemicals, Co., Ltd, 1 Siam Cement Road, Bangsue, Bangkok 10800, Thailand
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Abstract

Pd/Al2O3 catalysts prepared from Pd nitrate dissolved in water (Pd-water) and toluene (Pd-toluene) were investigated in the gas-phase selective hydrogenation of 1,3-butadiene under various reaction conditions. As revealed by TEM and CO chemisorption results, smaller Pd particle sizes with more uniform particle size distribution were obtained on Pd-toluene catalysts. Reduction at 500 °C resulted in sintering of Pd particles with Pd-water showing higher degree of metal sintering than Pd-toluene. Sintering of Pd particles may result in low-index surfaces which promoted butane formation and lowered 1-butene selectivity. While Pd dispersion and/or Pd particle size strongly affected 1,3-butadiene hydrogenation rate and 1-butene selectivity, the selectivity to 2-butenes was quite similar at 47–55% for all the catalysts under various reaction conditions.

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