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

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

doi:10.1021/cm062034x

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

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

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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 language	English (US)
Pages (from-to)	894-902
Number of pages	9
Journal	Chemistry of Materials
Volume	19
Issue number	4
DOIs	https://doi.org/10.1021/cm062034x
State	Published - Feb 20 2007

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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10.1021/cm062034x

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title = "Temperature-dependent halogen-exchange activity studies of zeolite-derived aluminum trifluoride",

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.",

author = "Hajime, {Evan K.L.Y.} and Delattre, {James L.} and Stacy, {Angelica M.}",

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

AU - Hajime, Evan K.L.Y.

AU - Delattre, James L.

AU - Stacy, Angelica M.

PY - 2007/2/20

Y1 - 2007/2/20

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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DO - 10.1021/cm062034x

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JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 4

ER -

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

Abstract

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