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Surface and Bulk Chemistry of Mechanochemically Synthesized Tohdite Nanoparticles

MPS-Authors
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De Bellis,  Jacopo
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Ochoa-Hernández,  Cristina
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Farès,  Christophe
Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Petersen,  Hilke
Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Ternieden,  Jan
Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Weidenthaler,  Claudia
Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Amrute,  Amol P.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

De Bellis, J., Ochoa-Hernández, C., Farès, C., Petersen, H., Ternieden, J., Weidenthaler, C., et al. (2022). Surface and Bulk Chemistry of Mechanochemically Synthesized Tohdite Nanoparticles. Journal of the American Chemical Society, 144(21), 9421-9433. doi:10.1021/jacs.2c02181.


Cite as: http://hdl.handle.net/21.11116/0000-000A-9585-7
Abstract
Aluminum oxides, oxyhydroxides, and hydroxides are important in different fields of application due to their many attractive properties. However, among these materials, tohdite (5Al2O3·H2O) is probably the least known because of the harsh conditions required for its synthesis. Herein, we report a straightforward methodology to synthesize tohdite nanopowders (particle diameter ∼13 nm, specific surface area ∼102 m2 g–1) via the mechanochemically induced dehydration of boehmite (γ-AlOOH). High tohdite content (about 80%) is achieved upon mild ball milling (400 rpm for 48 h in a planetary ball mill) without process control agents. The addition of AlF3 can promote the crystallization of tohdite by preventing the formation of the most stable α-Al2O3, resulting in the formation of almost phase-pure tohdite. The availability of easily accessible tohdite samples allowed comprehensive characterization by powder X-ray diffraction, total scattering analysis, solid-state NMR (1H and 27Al), N2-sorption, electron microscopy, and simultaneous thermal analysis (TG-DSC). Thermal stability evaluation of the samples combined with structural characterization evidenced a low-temperature transformation sequence: 5Al2O3·H2O → κ-Al2O3 → α-Al2O3. Surface characterization via DRIFTS, ATR-FTIR, D/H exchange experiments, pyridine-FTIR, and NH3-TPD provided further insights into the material properties.