Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR

A. Malki; Z. Mekhalif; S. Detriche; G. Fonder; A. Boumaza; A. Djelloul

doi:10.1016/j.jssc.2014.03.019

Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR

A. Malki, Z. Mekhalif, S. Detriche, G. Fonder, A. Boumaza, A. Djelloul

University of Namur

Research output: Contribution to journal › Article

Abstract

The changes caused by heat treatment of gibbsite powder at 300-1473 K were studied using the X-ray diffraction (XRD), X-ray photoemission (XPS) spectra and ²⁷Al magic angle spinning nuclear magnetic resonance spectroscopy (²⁷Al MAS NMR). XRD analysis indicates that the transformation sequence involves the formation of κ-Al₂O₃ as an intermediate phase between χ- and α-Al₂O₃. The crystallite size of χ-Al₂O₃ is as small as 10 nm. XPS analysis indicates that the ratio of aluminium atoms to oxygen atoms in χ-Al₂O₃ and κ-Al₂O₃ increases, whereas the expected ratio is observed in α-Al ₂O₃. The percentage of AlO₄ units in the transition aluminas follows the same behaviour as the ratio of Al/O.

Original language	English
Pages (from-to)	8-15
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	215
DOIs	https://doi.org/10.1016/j.jssc.2014.03.019
Publication status	Published - 1 Jan 2014

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Keywords

Gibbsite
Transition alumina
X-ray diffraction
X-ray photoelectron microscopy

Cite this

Malki, A., Mekhalif, Z., Detriche, S., Fonder, G., Boumaza, A., & Djelloul, A. (2014). Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR. Journal of Solid State Chemistry, 215, 8-15. https://doi.org/10.1016/j.jssc.2014.03.019

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abstract = "The changes caused by heat treatment of gibbsite powder at 300-1473 K were studied using the X-ray diffraction (XRD), X-ray photoemission (XPS) spectra and 27Al magic angle spinning nuclear magnetic resonance spectroscopy (27Al MAS NMR). XRD analysis indicates that the transformation sequence involves the formation of κ-Al2O3 as an intermediate phase between χ- and α-Al2O3. The crystallite size of χ-Al2O3 is as small as 10 nm. XPS analysis indicates that the ratio of aluminium atoms to oxygen atoms in χ-Al2O3 and κ-Al2O3 increases, whereas the expected ratio is observed in α-Al 2O3. The percentage of AlO4 units in the transition aluminas follows the same behaviour as the ratio of Al/O.",

keywords = "Gibbsite, Transition alumina, X-ray diffraction, X-ray photoelectron microscopy",

author = "A. Malki and Z. Mekhalif and S. Detriche and G. Fonder and A. Boumaza and A. Djelloul",

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AU - Malki, A.

AU - Mekhalif, Z.

AU - Detriche, S.

AU - Fonder, G.

AU - Boumaza, A.

AU - Djelloul, A.

PY - 2014/1/1

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AB - The changes caused by heat treatment of gibbsite powder at 300-1473 K were studied using the X-ray diffraction (XRD), X-ray photoemission (XPS) spectra and 27Al magic angle spinning nuclear magnetic resonance spectroscopy (27Al MAS NMR). XRD analysis indicates that the transformation sequence involves the formation of κ-Al2O3 as an intermediate phase between χ- and α-Al2O3. The crystallite size of χ-Al2O3 is as small as 10 nm. XPS analysis indicates that the ratio of aluminium atoms to oxygen atoms in χ-Al2O3 and κ-Al2O3 increases, whereas the expected ratio is observed in α-Al 2O3. The percentage of AlO4 units in the transition aluminas follows the same behaviour as the ratio of Al/O.

KW - Gibbsite

KW - Transition alumina

KW - X-ray diffraction

KW - X-ray photoelectron microscopy

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10.1016/j.jssc.2014.03.019

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