New understanding and simple approach to synthesize highly hydrothermally stable and ordered mesoporous materials

Pan, Dahai, Yuan, Pei, Zhao, Linzhi, Liu, Nian, Zhou, Liang, Wei, Guangfeng, Zhang, Jun, Ling, Yichuan, Fan, Yu, Wei, Baoying, Liu, Haiyan, Yu, Chengzhong and Bao, Xiaojun (2009) New understanding and simple approach to synthesize highly hydrothermally stable and ordered mesoporous materials. Chemistry of Materials, 21 22: 5413-5425. doi:10.1021/cm901999n

Author Pan, Dahai
Yuan, Pei
Zhao, Linzhi
Liu, Nian
Zhou, Liang
Wei, Guangfeng
Zhang, Jun
Ling, Yichuan
Fan, Yu
Wei, Baoying
Liu, Haiyan
Yu, Chengzhong
Bao, Xiaojun
Title New understanding and simple approach to synthesize highly hydrothermally stable and ordered mesoporous materials
Journal name Chemistry of Materials   Check publisher's open access policy
ISSN 0897-4756
Publication date 2009-11-24
Sub-type Article (original research)
DOI 10.1021/cm901999n
Volume 21
Issue 22
Start page 5413
End page 5425
Total pages 13
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract Highly ordered mesoporous materials with extremely high hydrothermal stability have been successfully synthesized by a novel and facile approach. Our method is built on the understanding that the hydrothermal treatment process plays an important role in the synthesis of mesoporous materials. It is proposed that in order to use high temperature hydrothermal treatment to increase the inorganic framework cross-linkage, an important requirement is that the organic surfactants must be retained as much as possible to maintain the preformed organic - inorganic composite mesostructure against framework shrinkage during the hydrothermal treatment process. This requirement can be achieved by enhancing the surfactant - silanol interaction at the organic - inorganic interface through adjusting the hydrothermal treatment pH and adding acetic acid (HAc) during the synthesis. When a high temperature (∼200 °C) hydrothermal treatment is employed, ordered mesoporous materials can only be obtained in a hydrothermal treatment pH range of 1-3. When the hydrothermal treatment pH is near the isoelectric point of silica, the highest silanol density on silica walls can entrap the largest amount of surfactants within pores, resulting in highly ordered mesostructured materials. Moreover, the disadvantage of the hydrothermal treatment under strong acidic conditions widely adopted in the literature has been revealed. Compared to previous reports, our approach is simple and does not involve environmentally unfriendly or expensive agents, thus is easy to be scaled up for industrial applications. Most strikingly, the highly ordered mesostructure of aluminosilicate synthesized by our approach can be maintained after steam treatment at 800 °C for 5 h with only a 4.9% decrease in the Brunauer - Emmett - Teller surface area. Our achievements have added new contributions to understanding the preparation of highly ordered and highly stable mesoporous materials, which sheds light on the practical applications of this new family of porous materials in the petroleum and petrochemical industry.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: ERA 2012 Admin Only
Australian Institute for Bioengineering and Nanotechnology Publications
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Created: Mon, 17 Oct 2011, 20:52:18 EST by Professor Chengzhong Yu on behalf of Aust Institute for Bioengineering & Nanotechnology