High-surface-area corundum by mechanochemically induced phase transformation of boehmite

American Association for the Advancement of Science (AAAS) - Tập 366 Số 6464 - Trang 485-489 - 2019
Amol P. Amrute1, Zbigniew Łodziana2, Hannah Schreyer1, Claudia Weidenthaler1, Ferdi Schüth1
1Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
2INP, Polish Academy of Sciences, ul. Radzikowskiego 152, PL- 31-342 Kraków, Poland.

Tóm tắt

Milling corundum nanoparticles High-purity corundum (α-Al 2 O 3 ) nanoparticles could enable applications such as more stable catalyst supports or precursors for high-strength ceramics. Milling of corundum only produces micrometer-scale particles, and direct synthesis from other aluminum oxides that would be likely starting materials, such as γ-Al 2 O 3 , fails because of the high activation barrier for converting the lattice structure of these cubic close-packed oxides. Amrute et al. show that ball milling of boehmite, γ-AlOOH, created ∼13-nanometer-diameter corundum nanoparticles of high purity through a mechanically induced dehydration reaction and by the effect of milling impacts on the surface energy of the particles. Science , this issue p. 485

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American Association for the Advancement of Science (AAAS)

Tập 366 Số 6464

485-489

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