High-temperature synthesis of highly hydrothermal stable mesoporous silica and Fe-SiO{sub 2} using ionic liquid as a template

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.01.006· OSTI ID:21494214

Liu, Hong ^[1]; Wang, Mengyang ^[1]; Hu, Hongjiu ^[2]; Liang, Yuguang; Wang, Yong; Cao, Weiran ^[1]; Wang, Xiaohong ^[3]

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1. Department of Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444 (China)
2. College of Science, Shanghai University, 149 Yanchang Road, Shanghai 200072 (China)
3. Institute of Nano Micro Energy, Shanghai University, 99 Shangda Road, Shanghai 200444 (China)

Mesoporous silicas and Fe-SiO{sub 2} with worm-like structures have been synthesized using a room temperature ionic liquid, 1-hexadecane-3-methylimidazolium bromide, as a template at a high aging temperature (150-190 {sup o}C) with the assistance of NaF. The hydrothermal stability of mesoporous silica was effectively improved by increasing the aging temperature and adding NaF to the synthesis gel. High hydrothermally stable mesoporous silica was obtained after being aged at 190 {sup o}C in the presence of NaF, which endured the hydrothermal treatment in boiling water at least for 10 d or steam treatment at 600 {sup o}C for 6 h. The ultra hydrothermal stability could be attributed to its high degree of polymerization of silicate. Furthermore, highly hydrothermal stable mesoporous Fe-SiO{sub 2} has been synthesized, which still remained its mesostructure after being hydrothermally treated at 100 {sup o}C for 12 d or steam-treated at 600 {sup o}C for 6 h. -- Graphical abstract: Worm-like mesoporous silica and Fe-SiO{sub 2} with high hydrothermal stability have been synthesized using ionic liquid 1-hexadecane-3-methylimidazolium bromide as a template under the assistance of NaF at high temperature. Display Omitted Research highlights: {yields} Increasing aging temperature improved the hydrothermal stability of materials. {yields}Addition of NaF enhanced the polymerization degree of silicates. {yields} Mesoporous SiO{sub 2} and Fe-SiO{sub 2} obtained have remarkable hydrothermal stability.

• OSTI ID: 21494214
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 3; Other Information: DOI: 10.1016/j.jssc.2011.01.006; PII: S0022-4596(11)00007-7; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BROMIDES
HEXADECANE
IRON COMPOUNDS
MOLTEN SALTS
NANOSTRUCTURES
POLYMERIZATION
SILICA
SILICATES
SILICON OXIDES
SODIUM FLUORIDES
STABILITY
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
ALKALI METAL COMPOUNDS
ALKANES
BROMINE COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SALTS
SILICON COMPOUNDS
SODIUM COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS