Selectivity to Olefins in the Hydrodechlorination of Chloroform with Activated Carbon-Supported Palladium Catalysts

C. Fernandez-Ruiz, J. Bedia, S. Andreoli, S. Eser, J. J. Rodriguez, L. M. Gómez-Sainero

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4 Scopus citations

Abstract

This study analyzes the selectivity of Pd (1 wt %) catalysts supported on different activated carbons to produce olefins from hydrodechlorination of chloroform. It was found that selectivity to olefins was favored by a higher zerovalent to electrodeficient Pd ratio (Pd0/Pdn+) and by a lower amount of oxygen-containing surface functional groups on the activated carbon supports. Thus, the highest selectivity to olefins was obtained by catalysts supported on FeCl3- A nd ZnCl2-activated carbons. Conversely, the catalysts supported on KOH-, NaOH-, and H3PO4-activated carbons gave the lowest selectivity to olefins. These catalysts showed higher surface concentrations of electro-deficient Pd as well as high concentrations of oxygen functional groups that enhance the adsorption of reactants and intermediates. This leads to complete hydrogenation of reaction intermediates and poisoning of active sites by the adsorption of chlorocarbon compounds. ZnCl2-derived catalysts with the highest selectivity to olefins also showed an outstanding stability, most likely due to redispersion into very small and well-distributed Pd particles during the reaction. However, FeCl3-derived catalysts gave rise to sintering of Pd particles, resulting in a marked loss of activity.

Original languageEnglish (US)
Pages (from-to)20592-20600
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number45
DOIs
StatePublished - Nov 13 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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