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Citation: Chenglong Zou, Guanyu Sha, Haifang Gu, Yao Huang, Guoxing Niu. Facile solvothermal post-treatment to improve hydrothermal stability of mesoporous SBA-15 zeolite[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1350-1357. doi: 10.1016/S1872-2067(15)60857-9 shu

Facile solvothermal post-treatment to improve hydrothermal stability of mesoporous SBA-15 zeolite

1.
a Department of Chemistry, Fudan University, Shanghai 200433, China;

Corresponding author: Guoxing Niu,
Received Date: 10 February 2015
Available Online: 30 March 2015
Fund Project: 国家重点基础研究发展计划(973计划, 2010CB226901, 2013CB934100) (973计划, 2010CB226901, 2013CB934100) 国家自然科学基金(20890123). (20890123)

A simple and effective approach is demonstrated to improve the hydrothermal stability of mesoporous SBA-15 zeolite via a post-synthesis treatment of organic solvents, such as cyclohexane, toluene and n-butanol, at 157 or 190 ℃ for 6-24 h. After hydrothermal treatment at 800 ℃ for 12 h in 100% steam, the treated SBA-15 retained a well-ordered mesostructure, and retained high surface areas of 192-281 m²/g. SBA-15 zeolite treated by cyclohexane at 190 ℃ for 24 h showed the highest hydrothermal stability. The stabilization mechanism suggests that the solvothermal treatment has a significant promoting effect on dehydrating Si-OH groups in silica walls to form stable Si(OSi)₄ from Si(OSi)₂(OH)₂ or Si(OSi)₃OH groups. As a result, the wall defects after solvothermal treatment decrease, and the stability of silica is improved remarkably. This promoting effect strongly depends on the solvent properties, treatment temperature, and precursors of SBA-15 zeolite. The treatment by a nonpolar and low boiling point organic solvent displays the highest promoting effect on the calcined SBA-15 zeolite. This approach is simple, has low energy consumption and has potential application in the laboratory and for industry to prepare hydrothermally stable well-ordered mesoporous SBA-15 zeolite.
- Mesoporous material,
- SBA-15 zeolite,
- Hydrothermal stability,
- Solvothermal treatment,
- Dehydration
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