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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)8-15
Number of pages8
JournalJournal of Solid State Chemistry
Volume215
DOIs
Publication statusPublished - 1 Jan 2014

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Photoemission
Calcination
roasting
photoelectric emission
Nuclear magnetic resonance
solid state
X ray diffraction
X rays
Atoms
nuclear magnetic resonance
Magic angle spinning
Aluminum Oxide
products
Crystallite size
Aluminum
diffraction
Powders
X ray diffraction analysis
Nuclear magnetic resonance spectroscopy
x rays

Keywords

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

Cite this

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title = "Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR",
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",
year = "2014",
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Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR. / Malki, A.; Mekhalif, Z.; Detriche, S.; Fonder, G.; Boumaza, A.; Djelloul, A.

In: Journal of Solid State Chemistry, Vol. 215, 01.01.2014, p. 8-15.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR

AU - Malki, A.

AU - Mekhalif, Z.

AU - Detriche, S.

AU - Fonder, G.

AU - Boumaza, A.

AU - Djelloul, A.

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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.

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KW - Transition alumina

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KW - X-ray photoelectron microscopy

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