Graphitization as a way to stabilize textural characteristics of alumina under hydrothermal conditions

Authors

Mikhail Parfenov¹ , Marya Kazakova¹ , Alexander Selyutin² , Arkady Ishchenko¹ , Maxim Kazakov¹

1. Boreskov Institute of Catalysis, Novosibirsk State University
2. Novosibirsk State University, Synchrotron Radiation Facility SKIF

Conference / event

8th Asian Symposium on Advanced Materials ASAM-8, July 2023 (Novosibirsk, Russian Federation)

Poster summary

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.

Keywords

Al2O3, CVD, Hydrothermal stability

Research areas

Chemistry

References

1. 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.

Funding

1. Russian Science Foundation (No. 21-73-10039)

Supplemental files

No data provided

Additional information

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.