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Strong Lewis acidic catalysts for C–F bond activation by fluorination of activated γ-Al2O3

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Abstract

A strong solid Lewis acid catalyst has been successfully obtained by modifying a known procedure of fluorinating γ-aluminium oxide, which was pre-calcined under vacuum. Calcination under vacuum at 700 °C followed by gas phase fluorination with CHClF2 led to various high-surface area materials. The structure and morphology of the catalysts was studied by P-XRD, N2 physisorption and MAS NMR spectroscopy. Their acidic sites were characterized by CD3CN adsorption and DRIFT spectroscopy as well as NH3 TPD measurements. The catalysts exhibit a moderate number of acidic sites, which however possess a very strong Lewis acidic character, and are remarkably active in catalysis, when compared to other fluorinated alumina phases known. They mediate in the presence of a silane with 1-fluoropentane dehydrofluorination reactions, isomerize 1,2-dibromohexafluoropropane and promote dismutation of CHClF2 at room temperature. This outstanding reactivity classifies these novel catalysts as strong solid Lewis acids, comparable with aluminium chlorofluoride or high-surface aluminium fluoride.

Graphical abstract: Strong Lewis acidic catalysts for C–F bond activation by fluorination of activated γ-Al2O3

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Article information


Submitted
07 Aug 2019
Accepted
07 Dec 2019
First published
09 Dec 2019

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Strong Lewis acidic catalysts for C–F bond activation by fluorination of activated γ-Al2O3

C. P. Marshall, G. Scholz, T. Braun and E. Kemnitz, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY01585J

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