Zeolite catalysts for dehalogenation processes

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Abstract

A review is given of recent work in which zeolites have been used to catalyse the decomposition, oxidation or hydrodehalogenation of halogen containing molecules. The reactivity of CFCs depends strongly on the number of C-H and C-Cl bonds in the molecule. Reactions over FAU and MFI zeolites involve acid sites, and irreversible dealumination of the zeolites through the formation of extraframework AlF3 species. Halons (bromofluorocarbons) have been less widely studied, but both pyrolysis and hydrodehalogenation reactions occur over transition metal exchanged MFI zeolites. Both acidic and metal loaded zeolites have also been explored as catalysts for the oxidation and/or hydrodehalogenation of other organohalogen compounds of environmental concern. Features of zeolite chemistry common to these different applications are identified, and prospects for development of zeolite based dehalogenation processes for environmental protection discussed. (C) 2004 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)311
Number of pages9
JournalApplied Catalysis A: General
Volume271
DOIs
Publication statusPublished - 2004

Keywords

  • zeolite catalysts
  • dehalogenation
  • hydrodehalogenation
  • halons
  • FAUJASITE-TYPE ZEOLITES
  • GAS-PHASE REACTION
  • ENVIRONMENTAL-PROTECTION
  • CARBON-TETRACHLORIDE
  • PALLADIUM CATALYSTS
  • ORGANIC-COMPOUNDS
  • FERMI RESONANCE
  • CCL2F2 CFC-12
  • MONTE-CARLO
  • HALON 1301

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