Post-synthesis alumination of SBA-15 in aqueous solution: A versatile tool for the preparation of acidic Al-SBA-15 supports

✍ Scribed by Shuangqin Zeng; Juliette Blanchard; Michèle Breysse; Yahua Shi; Xingtian Shu; Hong Nie; Dadong Li

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 257 KB
• Volume: 85
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/j.micromeso.2005.06.031

✦ Synopsis

Al-SBA-15 supports were prepared by post-synthesis alumination in aqueous solution of a pure silica SBA-15 material. The effects of the aluminium concentration [Al], and of the hydrolysis ratio h 7+ , aluminium polymers) in the solution were examined. Depending on h and [Al], samples with various Si/Al ratios and acidities were obtained. The effects of h and [Al] on the characteristics of the final material were assigned to the speciation of the aluminium in the alumination solution: a correlation between the species present in solution and the Si/Al ratio in the final materials leads us to propose that [Al 13 O 4 (OH) 24 (H 2 O) 20 ] is the most reactive and effective species toward grafting on the silica surface.