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

• Published in: Journal of solid state chemistry Vol. 184; no. 3; pp. 509 - 515
• Main Authors: Liu, Hong, Wang, Mengyang, Hu, Hongjiu, Liang, Yuguang, Wang, Yong, Cao, Weiran, Wang, Xiaohong
• Format: Journal Article
• Language: English
• Published: 01.01.2011
• Subjects: Boiling; Degree of polymerization; Durability; Ionic liquids; Iron; Silicates; Silicon dioxide; Stability; Synthesis
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2011.01.006

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 [deg]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 [deg]C in the presence of NaF, which endured the hydrothermal treatment in boiling water at least for 10 d or steam treatment at 600 [deg]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 [deg]C for 12 d or steam-treated at 600 [deg]C for 6 h.