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Adsorption of HF on gibbsite calcined at various temperatures : a solid-state NMR study of low-level fluorinated systems
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Agbenyegah, Gordon, Clark, Joshua P., Hanna, John V., Hyland, Margaret, Metson, James B., McIntosh, Grant, Etzion, Ronny, Bowmaker, Graham A. and Zujovic, Zoran (2022) Adsorption of HF on gibbsite calcined at various temperatures : a solid-state NMR study of low-level fluorinated systems. Journal of Physics and Chemistry of Solids, 160 . 110355. doi:10.1016/j.jpcs.2021.110355 ISSN 0022-3697.
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WRAP-adsorption-HF-gibbsite-calcined-various-temperatures-solid-state-NMR-study-low-level-fluorinated-systems-Hanna-2021.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1007Kb) | Preview |
Official URL: https://doi.org/10.1016/j.jpcs.2021.110355
Abstract
The fluorination mechanism of low-level fluorinated materials obtained by calcination of Bayer gibbsite at different temperatures was studied by 27Al and 19F solid-state NMR spectroscopy and X-ray diffraction. Gibbsite was calcined at 400, 600, 800, and 1000 °C followed by treatment with anhydrous HF/N2 gas at 100 °C. Three types of Al–F species on the surface of fluorinated gibbsite calcined at 400, 600, and 800 °C are proposed on the basis of the 19F magic angle spinning (MAS) NMR spectra, which show peaks at about −132, −137, and −163 ppm, while the spectrum of fluorinated gibbsite calcined at 1000 °C showed five additional peaks, at about −139, −164, −176, −183, and −191 ppm. The fluorination process in aluminas is based on elementary exchange reactions in which F− replaces surface –OH groups according to their basicity. The 27Al MAS NMR and 19F-27Al cross-polarization–MAS experiments confirmed the presence of octahedral Al species.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QD Chemistry | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Library of Congress Subject Headings (LCSH): | Fluorination, Nuclear magnetic resonance spectroscopy, Aluminum hydroxide, Hydrogen fluoride | ||||||||
Journal or Publication Title: | Journal of Physics and Chemistry of Solids | ||||||||
Publisher: | Elsevier Ltd. | ||||||||
ISSN: | 0022-3697 | ||||||||
Official Date: | January 2022 | ||||||||
Dates: |
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Volume: | 160 | ||||||||
Article Number: | 110355 | ||||||||
DOI: | 10.1016/j.jpcs.2021.110355 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 15 July 2022 | ||||||||
Date of first compliant Open Access: | 28 August 2022 | ||||||||
RIOXX Funder/Project Grant: |
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