Temperature-dependent halogen-exchange activity studies of zeolite-derived aluminum trifluoride

Evan K.L.Y. Hajime, James L. Delattre, Angelica M. Stacy

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A high-surface-area (190 m2/g) amorphous aluminum trifluoride material ("plasma-AlF3") was synthesized by plasma decomposition of zeolite, and its structural and reactivity properties were investigated. High-resolution transmission electron microscopy of plasma-AlF3 indicates morphological features on the nanometer-scale, whereas temperature-programmed X-ray diffraction is used to determine the phase-transition temperatures of plasma-AlF3 to β- and α-AlF3. Halogen-exchange reactivity is studied by temperature-programmed reaction (TPR) techniques using the dismutation of CCl2F2 as a model reaction. Plasma-AlF3 is found to possess an unexpected low-temperature (>315°C) activity not observed with the well-known halogen-exchange catalyst β-AlF3. Supporting TPR studies on aluminum trifluoride hydrates are performed to correlate this new activity with an amorphous AlF3 structure, and a simple Lewis acid model is presented to explain the reactivity data.

Original languageEnglish (US)
Pages (from-to)894-902
Number of pages9
JournalChemistry of Materials
Volume19
Issue number4
DOIs
StatePublished - Feb 20 2007

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Zeolites
Halogens
Aluminum
Plasmas
Temperature
Temperature scales
Lewis Acids
Hydrated alumina
High resolution transmission electron microscopy
Superconducting transition temperature
Phase transitions
aluminum fluoride
Decomposition
X ray diffraction
Catalysts
Acids

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

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Temperature-dependent halogen-exchange activity studies of zeolite-derived aluminum trifluoride. / Hajime, Evan K.L.Y.; Delattre, James L.; Stacy, Angelica M.

In: Chemistry of Materials, Vol. 19, No. 4, 20.02.2007, p. 894-902.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Temperature-dependent halogen-exchange activity studies of zeolite-derived aluminum trifluoride

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AU - Delattre, James L.

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N2 - A high-surface-area (190 m2/g) amorphous aluminum trifluoride material ("plasma-AlF3") was synthesized by plasma decomposition of zeolite, and its structural and reactivity properties were investigated. High-resolution transmission electron microscopy of plasma-AlF3 indicates morphological features on the nanometer-scale, whereas temperature-programmed X-ray diffraction is used to determine the phase-transition temperatures of plasma-AlF3 to β- and α-AlF3. Halogen-exchange reactivity is studied by temperature-programmed reaction (TPR) techniques using the dismutation of CCl2F2 as a model reaction. Plasma-AlF3 is found to possess an unexpected low-temperature (>315°C) activity not observed with the well-known halogen-exchange catalyst β-AlF3. Supporting TPR studies on aluminum trifluoride hydrates are performed to correlate this new activity with an amorphous AlF3 structure, and a simple Lewis acid model is presented to explain the reactivity data.

AB - A high-surface-area (190 m2/g) amorphous aluminum trifluoride material ("plasma-AlF3") was synthesized by plasma decomposition of zeolite, and its structural and reactivity properties were investigated. High-resolution transmission electron microscopy of plasma-AlF3 indicates morphological features on the nanometer-scale, whereas temperature-programmed X-ray diffraction is used to determine the phase-transition temperatures of plasma-AlF3 to β- and α-AlF3. Halogen-exchange reactivity is studied by temperature-programmed reaction (TPR) techniques using the dismutation of CCl2F2 as a model reaction. Plasma-AlF3 is found to possess an unexpected low-temperature (>315°C) activity not observed with the well-known halogen-exchange catalyst β-AlF3. Supporting TPR studies on aluminum trifluoride hydrates are performed to correlate this new activity with an amorphous AlF3 structure, and a simple Lewis acid model is presented to explain the reactivity data.

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