Effect of Carbon Coating on the Thermal Stability of Nanocrystalline χ-Al2O3 Full article
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Materials Chemistry and Physics
ISSN: 0254-0584 , E-ISSN: 1879-3312 |
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| Output data | Year: 2020, Volume: 240, Article number : 122135, Pages count : 5 DOI: 10.1016/j.matchemphys.2019.122135 | ||
| Tags | Al2O3; Carbon coating; Core-shell; NMR; Phase transformation; Sintering | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 16-13-10168 |
Abstract:
χ-Al2O3 is a rarely studied low-temperature alumina phase that can be prepared in a finely dispersed form and attracts interest as a potential catalyst or catalyst support. Phase transformations of nanocrystalline χ-Al2O3 and χ-Al2O3@C core-shell materials in the temperature range of 650–1400 °C were studied by XRD and 27Al solid-state NMR. Deposition of the carbon shell was demonstrated to stabilize the oxide core size and extend the stability range of the low-temperature χ-Al2O3 phase to 1100 °C. Relatively high surface area of the oxide core consisting of χ-and κ-Al2O3, which was close to 80 m2/g after burning of the carbon shell, was preserved after the heat treatment at 1100 °C. Meanwhile, calcination of pure χ-Al2O3 at the same temperature yielded a sample consisting of α-and κ-Al2O3 with the surface are as low as 15 m2/g. Solid-state 27Al NMR with magic-angle spinning proved to be an efficient tool for investigation of χ- → κ- → α-Al2O3 phase transformations that can be used to obtain quantitative information on the alumina phase composition. © 2019 Elsevier B.V.
Cite:
Yakovlev I.V.
, Volodin A.M.
, Stoyanovskii V.O.
, Lapina O.B.
, Bedilo A.F.
Effect of Carbon Coating on the Thermal Stability of Nanocrystalline χ-Al2O3
Materials Chemistry and Physics. 2020. V.240. 122135 :1-5. DOI: 10.1016/j.matchemphys.2019.122135 WOS Scopus РИНЦ AN OpenAlex
Effect of Carbon Coating on the Thermal Stability of Nanocrystalline χ-Al2O3
Materials Chemistry and Physics. 2020. V.240. 122135 :1-5. DOI: 10.1016/j.matchemphys.2019.122135 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Feb 15, 2019 |
| Accepted: | Sep 5, 2019 |
| Published online: | Sep 6, 2019 |
| Published print: | Jan 15, 2020 |
Identifiers:
| Web of science: | WOS:000505100900030 |
| Scopus: | 2-s2.0-85072049015 |
| Elibrary: | 41635562 |
| Chemical Abstracts: | 2019:1776683 |
| OpenAlex: | W2971678213 |