Non-oxidative reaction of CBrF3 with methane over NiZSM-5 and HZSM-5

K Li, E M Kennedy, B Z Dlugogorski, Russell Francis Howe

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Abstract

Catalytic hydrodehalogenation of CBrF3 with methane was studied over NiZSM-5 and HZSM-5 in tubular reactor between 573 and 873 K and at ambient pressure. It was found that the incorporation of nickel into HZSM-5 significantly enhanced the activity of the zeolite. A variety of products were formed during reaction, including CH3Br, CHF3, CH2Br2, C2F6, C2H4, C2H2, C2H2F2, CHBrF2, CH2BrF, and C2H3Br. XRD analysis showed that these two zeolite catalysts did not suffer any loss in their crystallinity during use. Deactivation of both NiZSM-5 and HZSM-5 may, in part, be due to poisoning of the zeolite by halogens. Coking is another cause of the deactivation of HZSM-5, but appears to play a minor role in NiZSM-5 deactivation. A series of methylated silicone oils was detected during reaction over NiZSM-5. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)355-362
Number of pages8
JournalCatalysis Today
Volume63
Issue number2-4
Early online date30 Nov 2000
DOIs
Publication statusPublished - 25 Dec 2000

Keywords

  • NiZSM-5
  • HZSM-5
  • halon 1301
  • CBrF3
  • methane
  • hydrodehalogenation
  • supported palladium catalysts
  • CCL2F2 CFC-12
  • CH2F2 HFC-32
  • selective hydrogenolysis
  • activated carbon
  • hydrodechlorination
  • conversion
  • decomposition
  • hydrocarbons
  • destruction

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