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| - Temperature-Dependent Halogen-Exchange Activity Studies ofZeolite-Derived Aluminum Trifluoride
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| - A high-surface-area (190 m2/g) amorphous aluminum trifluoride material (“plasma-AlF3”) wassynthesized by plasma decomposition of zeolite, and its structural and reactivity properties wereinvestigated. High-resolution transmission electron microscopy of plasma-AlF3 indicates morphologicalfeatures on the nanometer-scale, whereas temperature-programmed X-ray diffraction is used to determinethe phase-transition temperatures of plasma-AlF3 to β- and α-AlF3. Halogen-exchange reactivity is studiedby 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 withthe well-known halogen-exchange catalyst β-AlF3. Supporting TPR studies on aluminum trifluoridehydrates are performed to correlate this new activity with an amorphous AlF3 structure, and a simpleLewis acid model is presented to explain the reactivity data.
- Nanostructured aluminum fluoride derived from the plasma decomposition of zeolite exhibits markedly different temperature-dependent halogen-exchange activity when compared to the well-known halogen-exchange catalyst, β-AlF3. Further reactivity studies of aluminum fluoride hydrates implicate the importance of an amorphous structure at the origins of this activity.
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