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The Microstructure of gamma-Alumina
Journal article   Open access   Peer reviewed

The Microstructure of gamma-Alumina

Natalie M. Stuart and Karl Sohlberg
Energies (Basel), v 14(20), p6472
01 Oct 2021
DOI: https://doi.org/10.3390/en14206472
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.3390/en14206472View
Published, Version of Record (VoR)CC BY V4.0,  Open

Abstract

Energy & Fuels Science & Technology Technology
Though gamma-Al2O3 has played a central role in heterogeneous catalysis for more than two centuries, its microstructure continues to be debated. Specifically, the positions of Al3+ cations within the crystal lattice have been discussed extensively in the literature. Many authors uphold that the cations primarily occupy spinel sites, while others endorse the occupation of non-spinel sites. The other main point of dispute is whether the structure contains interstitial hydrogen, with some authors supporting a partially hydrated model and others claiming that the structure must be completely dehydrated. The use of different structural models directly affects the predicted geometry of gamma-Al2O3 at the surface, which in turn has significant implications for its catalytic utility. A comparison of theoretical data to experimental infrared (IR), X-ray diffraction (XRD), and selected area electron diffraction (SAED) evidence suggests that gamma-Al2O3 features cations primarily in spinel positions, while IR and nuclear magnetic resonance (NMR) data indicate that interstitial hydrogen is present within the bulk structure.

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47 citations in Web of Science
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