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Comparative study of the strongest solid Lewis acids known: ACF and HS-AlF3

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Abstract

Aluminium chlorofluoride (ACF) and high-surface aluminium fluoride (HS-AlF3) were analyzed by a set of characterization methods to assess their acidic properties: NH3-TPD, CO adsorption followed by DRIFTS, CD3CN-PAS-FTIR and MAS NMR spectroscopy after 15N-pyridine adsorption. Both catalysts contain very strong and medium-strong Lewis acid sites as confirmed by CO adsorption, in which small differences arise from the morphological properties of each catalyst, with ACF being microporous and HS-AlF3 mesoporous. Shifts of the CO vibration band of up to 77 cm−1 were observed, which account for very strong Lewis acid sites. In addition, very strong Lewis acid sites could be identified by CD3CN-PAS for both catalysts, exhibiting a shift of 95 cm−1 from free nitrile, the highest ever reported for a solid Lewis acid.

Graphical abstract: Comparative study of the strongest solid Lewis acids known: ACF and HS-AlF3

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Publication details

The article was received on 10 Aug 2018, accepted on 02 Nov 2018 and first published on 02 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT03279C
Citation: Dalton Trans., 2018, Advance Article
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    Comparative study of the strongest solid Lewis acids known: ACF and HS-AlF3

    B. Calvo, C. P. Marshall, T. Krahl, J. Kröhnert, A. Trunschke, G. Scholz, T. Braun and E. Kemnitz, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT03279C

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