Реферат: 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.

Библиографическая ссылка: 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 CAPlus OpenAlex

Даты:

Поступила в редакцию:	15 февр. 2019 г.
Принята к публикации:	5 сент. 2019 г.
Опубликована online:	6 сент. 2019 г.
Опубликована в печати:	15 янв. 2020 г.

Идентификаторы БД:

Web of science:	WOS:000505100900030
Scopus:	2-s2.0-85072049015
РИНЦ:	41635562
Chemical Abstracts:	2019:1776683
OpenAlex:	W2971678213

Цитирование в БД:

БД	Цитирований
Scopus	7
РИНЦ	8
Web of science	6
OpenAlex	7

Альметрики: