Zeolite catalysts for Halon conversion

Russell Francis Howe, S. Thomson, Y. Yang, K. Lee, E. M. Kennedy, B. Z. Dlugogorski

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Al and Ni K-edge XANES and EXAFS experiments have been undertaken to characterise the chemical states of aluminium and nickel in NiZSM-5 catalysts used for the pyrolysis and hydrodehalogenation with methane of Halon 1301 (CF3Br). It is shown that pyrolysis of Halon 1301 over NiZSM-5 involves both extra-framework aluminium fluoride or hydroxyfluoride species and aggregated nickel species, probably fluorided. Reaction products are CF4 and C2F6. The reaction between Halon 1301 and methane over NiZSM-5 produces CHF3 and CH3Br as major, but not exclusive products. In the presence of CH4 framework dealumination and aggregation of nickel is inhibited. Future prospects for utilising these and similar catalysts in reactions of other Halons and CFCs to produce useful fluorocarbon products as an alternative to destruction are briefly discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)63-72
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume181
DOIs
Publication statusPublished - 2002

Keywords

  • zeolites
  • Halons
  • XANES
  • EXAFS
  • NiZSM-5
  • methane
  • supported palladium catalysts
  • CCL2F2 CFC-12
  • hydrodechlorination
  • decomposition
  • hydrogen
  • CBRF3
  • chlorofluorocarbons
  • fluorides
  • oxides

Cite this

Howe, R. F., Thomson, S., Yang, Y., Lee, K., Kennedy, E. M., & Dlugogorski, B. Z. (2002). Zeolite catalysts for Halon conversion. Journal of Molecular Catalysis A: Chemical, 181, 63-72. https://doi.org/10.1016/S1381-1169(01)00344-2

Zeolite catalysts for Halon conversion. / Howe, Russell Francis; Thomson, S.; Yang, Y.; Lee, K.; Kennedy, E. M.; Dlugogorski, B. Z.

In: Journal of Molecular Catalysis A: Chemical, Vol. 181, 2002, p. 63-72.

Research output: Contribution to journalArticle

Howe, RF, Thomson, S, Yang, Y, Lee, K, Kennedy, EM & Dlugogorski, BZ 2002, 'Zeolite catalysts for Halon conversion', Journal of Molecular Catalysis A: Chemical, vol. 181, pp. 63-72. https://doi.org/10.1016/S1381-1169(01)00344-2
Howe, Russell Francis ; Thomson, S. ; Yang, Y. ; Lee, K. ; Kennedy, E. M. ; Dlugogorski, B. Z. / Zeolite catalysts for Halon conversion. In: Journal of Molecular Catalysis A: Chemical. 2002 ; Vol. 181. pp. 63-72.
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AU - Howe, Russell Francis

AU - Thomson, S.

AU - Yang, Y.

AU - Lee, K.

AU - Kennedy, E. M.

AU - Dlugogorski, B. Z.

PY - 2002

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N2 - Al and Ni K-edge XANES and EXAFS experiments have been undertaken to characterise the chemical states of aluminium and nickel in NiZSM-5 catalysts used for the pyrolysis and hydrodehalogenation with methane of Halon 1301 (CF3Br). It is shown that pyrolysis of Halon 1301 over NiZSM-5 involves both extra-framework aluminium fluoride or hydroxyfluoride species and aggregated nickel species, probably fluorided. Reaction products are CF4 and C2F6. The reaction between Halon 1301 and methane over NiZSM-5 produces CHF3 and CH3Br as major, but not exclusive products. In the presence of CH4 framework dealumination and aggregation of nickel is inhibited. Future prospects for utilising these and similar catalysts in reactions of other Halons and CFCs to produce useful fluorocarbon products as an alternative to destruction are briefly discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

AB - Al and Ni K-edge XANES and EXAFS experiments have been undertaken to characterise the chemical states of aluminium and nickel in NiZSM-5 catalysts used for the pyrolysis and hydrodehalogenation with methane of Halon 1301 (CF3Br). It is shown that pyrolysis of Halon 1301 over NiZSM-5 involves both extra-framework aluminium fluoride or hydroxyfluoride species and aggregated nickel species, probably fluorided. Reaction products are CF4 and C2F6. The reaction between Halon 1301 and methane over NiZSM-5 produces CHF3 and CH3Br as major, but not exclusive products. In the presence of CH4 framework dealumination and aggregation of nickel is inhibited. Future prospects for utilising these and similar catalysts in reactions of other Halons and CFCs to produce useful fluorocarbon products as an alternative to destruction are briefly discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

KW - zeolites

KW - Halons

KW - XANES

KW - EXAFS

KW - NiZSM-5

KW - methane

KW - supported palladium catalysts

KW - CCL2F2 CFC-12

KW - hydrodechlorination

KW - decomposition

KW - hydrogen

KW - CBRF3

KW - chlorofluorocarbons

KW - fluorides

KW - oxides

U2 - 10.1016/S1381-1169(01)00344-2

DO - 10.1016/S1381-1169(01)00344-2

M3 - Article

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SP - 63

EP - 72

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

SN - 1381-1169

ER -