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A non-spinel model for the structure of γ-Al2O3, with 25% of the Al3+ cations at tetrahedral positions, has been the subject of wide interest. However, 17O NMR measurements and, more recently, 27Al NMR measurements have shown that there are considerably more Al3+ cations at tetrahedral positions. This means that the Al3+ vacancies in γ-Al2O3 are not at tetrahedral but at octahedral positions, as in isostructural γ-Fe2O3 and in accordance with DFT predictions. This has consequences with regard to the surface structure of γ-Al2O3 and, thus, for catalysis.
This article was published in the following journal.
Name: Angewandte Chemie (International ed. in English)
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The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.
Any of the numerous types of clay which contain varying proportions of Al2O3 and SiO2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees C with silica and water vapor. (From Hawley's Condensed Chemical Dictionary, 11th ed)
Migration of a foreign body from its original location to some other location in the body.
Location where dead bodies are kept until they are buried or cremated.
The sequential location of genes on a chromosome.