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

作者

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

会议/活动

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

海报摘要

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.

关键词

Al2O3, CVD, Hydrothermal stability

研究领域

Chemistry

参考文献

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.

基金

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

补充材料

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附加信息

利益冲突

No competing interests were disclosed.

数据可用性声明

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

知识共享许可协议

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.