Research output: Contribution to journal › Article › peer-review
Aerogel synthesis of calcium aluminates with varied stoichiometry. / Ilyina, Ekaterina V.; Bedilo, Alexander F.; Cherepanova, Svetlana V. et al.
In: Journal of Sol-Gel Science and Technology, Vol. 104, No. 2, 11.2022, p. 259-266.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Aerogel synthesis of calcium aluminates with varied stoichiometry
AU - Ilyina, Ekaterina V.
AU - Bedilo, Alexander F.
AU - Cherepanova, Svetlana V.
AU - Gerus, Yuri Y.
AU - Shuvarakova, Ekaterina I.
AU - Vedyagin, Aleksey A.
N1 - Funding Information: This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental order for Boreskov Institute of Catalysis (project No. AAAA-A21-121011390054-1). Publisher Copyright: © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2022/11
Y1 - 2022/11
N2 - Calcium aluminates are attractive materials possessing unique physicochemical properties. In the present work, three aluminate systems of varied Ca/Al ratio (1/2, 6/7, and 3/2) were prepared via aerogel technique and characterized. The decomposition behavior of hydroxide aerogels was studied by differential thermal analysis. As found, the specific surface area (SSA) of the samples dried in an autoclave at 265 °C is increased from 265 ± 10 to 515 ± 30 m2/g when the Ca/Al ratio changes from 3/2 to 1/2. The calcination of these samples at 500 °C decreases the SSA values ~1.6–1.8 times whereas the tendency regarding the Ca/Al ratio remains the same. Reflections assigned to a mixture of various calcium aluminate phases appeared in the diffraction patterns of the samples only after the calcination at 900 °C. The application of the spin probe electron paramagnetic resonance technique allowed registering electron-donor, weak electron-acceptor, and radical sites on the surface of all the aerogel samples of calcium aluminates calcined at 500 °C and their concentrations depended on the Ca/Al ratio.
AB - Calcium aluminates are attractive materials possessing unique physicochemical properties. In the present work, three aluminate systems of varied Ca/Al ratio (1/2, 6/7, and 3/2) were prepared via aerogel technique and characterized. The decomposition behavior of hydroxide aerogels was studied by differential thermal analysis. As found, the specific surface area (SSA) of the samples dried in an autoclave at 265 °C is increased from 265 ± 10 to 515 ± 30 m2/g when the Ca/Al ratio changes from 3/2 to 1/2. The calcination of these samples at 500 °C decreases the SSA values ~1.6–1.8 times whereas the tendency regarding the Ca/Al ratio remains the same. Reflections assigned to a mixture of various calcium aluminate phases appeared in the diffraction patterns of the samples only after the calcination at 900 °C. The application of the spin probe electron paramagnetic resonance technique allowed registering electron-donor, weak electron-acceptor, and radical sites on the surface of all the aerogel samples of calcium aluminates calcined at 500 °C and their concentrations depended on the Ca/Al ratio.
KW - Aerogel synthesis
KW - Calcium aluminate
KW - Differential thermal analysis
KW - Porous structure
KW - Spin probe EPR study
KW - X-ray diffraction analysis
UR - http://www.scopus.com/inward/record.url?scp=85138761996&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/f43aebed-d717-3d31-908b-b3f4c661e852/
U2 - 10.1007/s10971-022-05933-7
DO - 10.1007/s10971-022-05933-7
M3 - Article
AN - SCOPUS:85138761996
VL - 104
SP - 259
EP - 266
JO - Journal of Sol-Gel Science and Technology
JF - Journal of Sol-Gel Science and Technology
SN - 0928-0707
IS - 2
ER -
ID: 38073501