Graphitization as a way to stabilize textural characteristics of alumina under hydrothermal conditions
PUBLISHED June 28, 2023 (DOI: https://doi.org/10.54985/peeref.2306p2095503)
Mikhail Parfenov1 , Marya Kazakova1 , Alexander Selyutin2 , Arkady Ishchenko1 , Maxim Kazakov1
- Boreskov Institute of Catalysis, Novosibirsk State University
- Novosibirsk State University, Synchrotron Radiation Facility SKIF
Conference / event
- 8th Asian Symposium on Advanced Materials ASAM-8, July 2023 (Novosibirsk, Russian Federation)
- A simple approach is proposed to protect γ-Al2O3 porous structure from collapse under hydrothermal conditions. This approach is based on CVD of ethylene on the alumina surface at a temperature of 680°C. It has been established that carbon in C@Al2O3 samples is present in the form of nanocrystalline graphite with a graphene fragment size of less than 5 nm. It has been shown by XRD that the initial γ-Al2O3 transforms into boehmite during hydrothermal treatment, which leads to a decrease in the surface area by 80%. Whereas, a monolayer graphite coating of alumina under hydrothermal conditions contributes to the formation of a C@boehmite composite with a high specific surface area, stable under longer hydrothermal treatment. Thus, the graphite coating makes it possible to adapt γ-Al2O3 to hydrothermal conditions, which will allow using С@Al2O3 composites as a support for catalysts of various aqueous-phase reactions.
- Al2O3, CVD, Hydrothermal stability
- M.A. Kazakova, A.G. Selyutin, M.V. Parfenov, A.V. Ishchenko, M.O. Kazakov, Graphitization of alumina as a way to stabilize its textural characteristics under hydrothermal conditions, Micropor. Mesopor. Mat, 341 (2022) 112038.
- Russian Science Foundation (No. 21-73-10039)
- No data provided
- Competing interests
- No competing interests were disclosed.
- Data availability statement
- The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.
- Creative Commons license
- Copyright © 2023 Parfenov et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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