Destruction of chlorobenzenes by catalytic oxidation over transition metal containing ZSM-5 and Y(FAU) zeolites

J. Halász, M. Hegedus, É Kun, D. Méhn, I. Kiricsi

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Abstract

A potential method for oxidative destruction of environmentally harmful chlorobenzenes has been studied in a fixed-bed laboratory reactor using several transition metal containing ZSM-5 and Y(FAU) zeolite catalysts prepared by conventional (denoted L) and solid state (denoted S) ion-exchange procedures. The catalysts used for 10 hours in chlorobenzene (or dichlorobenzenes) oxidation have been destroyed in different degrees. The ZSM-5 structure proved to be more stable than that of Y(FAU). Considering the conversion and destruction efficiency of chlorobenzene oxidation at 450 °C as test reaction, activities of the ZSM-5 samples can be listed as follows: Na < CoL < CoS < MnS < MnL < FeL < FeS < CuS < H < CrL < CrS. In the side reactions polychlorinated derivatives (i.e. dioxines and PCB-s as undesired environmental pollution compounds) may be formed by the participation of elemental chlorine produced by the Deacon process. The activity series for the "coupling" reactions is as follows: CrS, CrL < H < FeL, FeS < CoS, CoL < MnS < MnL < CuS. Using CrZSM-5(S) catalyst at 550-600 °C with relatively high residence time and stoichiometric air, the conversion of chlorobenzene exceeds 90% with a decomposition efficiency (formation of HCl and Cl2 from organic chlorine) of about 85-90%.

Original languageEnglish
Pages (from-to)793-800
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume125
Publication statusPublished - Jan 1 1999

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ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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