Hydrodehalogenation with sonochemically prepared Mo2C and W 2C

James D. Oxley, Millan M. Mdleleni, Kenneth S. Suslick

Research output: Contribution to journalArticle

Abstract

The catalytic hydrodehalogenation (HDH) of several halogenated organic compounds was performed over sonochemically prepared molybdenum carbide and tungsten carbide at low temperatures (T = 200-300 °C). Both catalysts were selective, active, and stable for all substrates tested. Benzene was observed as the major product for the HDH of fluoro-, chloro-, bromo- and iodobenzene, with activities following the trend of C6H5F > C 6H5Cl > C6H5Br > C 6H5I. For the HDH of chlorofluorocarbons (CFCs), Cl was selectively removed over F and alkanes were the major product. In the liquid phase, the HDH of polychlorinated and polybrominated biphenyls resulted in biphenyl as the only product. The HDH of substrates bearing aliphatic C-Cl bonds occurs faster than those with arene C-Cl bonds. Time-on-stream studies of HDH of chlorobenzene show high stability for the sonochemically prepared catalysts, with half-lives as long as 600 h.

Original languageEnglish (US)
Pages (from-to)139-151
Number of pages13
JournalCatalysis Today
Volume88
Issue number3-4
DOIs
StatePublished - Feb 15 2004

Keywords

  • CFC
  • Carbide
  • Catalysts
  • Hydrodehalogenation
  • Molybdenum
  • PCB
  • Tungsten

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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