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  Surface and Bulk Chemistry of Mechanochemically Synthesized Tohdite Nanoparticles

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.

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Genre: Journal Article
Alternative Title : Journal of the American Chemical Society

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 Creators:
De Bellis, Jacopo1, Author              
Ochoa-Hernández, Cristina1, Author              
Farès, Christophe2, Author              
Petersen, Hilke3, Author              
Ternieden, Jan3, Author              
Weidenthaler, Claudia3, Author              
Amrute, Amol P.1, Author              
Schüth, Ferdi1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445623              
3Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              

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 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.

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Language(s): eng - English
 Dates: 2022-02-252022-05-232022-06-01
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jacs.2c02181
 Degree: -

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Title: Journal of the American Chemical Society
  Other : JACS
  Abbreviation : J. Am. Chem. Soc.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 144 (21) Sequence Number: - Start / End Page: 9421 - 9433 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870