Acetalization of carbonyl compounds catalyzed by acidic ionic liquid immobilized on silica gel

作者：Miao, Jinmei; Wan, Hui; Shao, Yanbing; Guan, Guofeng^*; Xu, Bin

来源：Journal of Molecular Catalysis A: Chemical , 2011, 348(1-2): 77-82.

DOI：10.1016/j.molcata.2011.08.005

• Acetalization
• Heterogeneous catalysis
• Silica-gel
• Ionic liquids
• Imidazole

Imidazolium-silica heterogeneous catalyst (SG-[(CH2)(3)SO3H-HIM]HSO4) was prepared by immobilization of acidic ionic liquid 1-(propyl-3-sulfonate) imidazolium hydrosulfate ([(CH2)(3)SO3H-HIM]HSO4) on silica-gel using tetraethoxysilane (TEOS) as silica source in this study. The properties of the samples were characterized by FT-IR, SEM and TG/DSC. The results suggested that [(CH2)(3)SO3H-HIM]HSO4 had been successfully immobilized on the surface of silica-gel and the immobilized ionic liquid catalyst SG-[(CH2)(3)SO3H-HIM]HSO4 had good thermal stability. The original smooth surface of silica-gel was covered with [(CH2)(3)SO3H-HIM]HSO4 and a rough surface of SG-[(CH2)(3)SO3H-HIM]HSO4 was formed, but the size of particles had no obvious change. Moreover, SG-[(CH2)(3)SO3H-HIM]HSO4 exhibited high catalytic activity for a series of acetalization and could be recovered easily. After reused for 10 times in the synthesis of benzaldehyde ethanediol acetal, the catalyst could still give satisfactory catalytic activity.

• 出版日期2011-9-1
• 单位南京工业大学