A "one-step" sulfonic acid PMO as a recyclable acid catalyst

作者：Lopez Maria I; Esquivel Dolores; Jimenez Sanchidrian Cesar; Romero Salguero Francisco J^*; Van Der Voort Pascal

来源：Journal of Catalysis, 2015, 326: 139-148.

DOI：10.1016/j.jcat.2015.04.008

• Acid-catalyzed reactions
• Periodic mesoporous organosilicas
• Sulfonic acid groups
• In situ oxidation

The synthesis and catalytic activity of a new sulfonic acid-functionalized periodic mesoporous organosilica (PMO) obtained by an in situ oxidation process have been reported. This material was prepared by co-condensation of a homemade thiol-functionalized bis-silane precursor (EtO)(3)Si-R-Si(OEt)(3) (R = CH2CHSH) with 1,2-bis(triethoxysilyl)ethane (BTEE) in the presence of a nonionic triblock co-polymer. Thiol groups were oxidized either in situ during the formation of the mesostructure, or by a post-synthesis oxidation of the solid material. The in situ generated sulfonated PMO material had a well-ordered hexagonal mesoporous structure and a narrow pore size distribution. The sulfonic acid concentration of these materials was in the range of 0.85-1.48 mmol H+ g(-1). The catalytic performance of these sulfonic acid-functionalized materials was evaluated and compared with the commercial resin Amberlyst-15 in the esterification of acetic acid with benzyl alcohol. The in situ sulfonated PMO has shown to be an efficient, robust, and recyclable catalyst in acid-catalyzed reactions throughout consecutive catalytic cycles.

• 出版日期2015-6