Abstract
Sulfonic acid-functionalized periodic mesoporous organosilicas were synthesized directly by cocondensation of (R′O) 3Si R Si(OR′) 3 (R = CH 2CH 2 and C 6H 4; R′ = CH 3 and C 2H 5) with 3-mercaptopropyltrimethoxysilane (MeO) 3SiCH 2CH 2CH 2SH in the presence of H 2O 2 using nonionic oligomeric polymer surfactant C 18H 37(OCH 2CH 2) 10OH in acidic medium. The sulfonic acid functionalities ( SO 3H) were generated in situ by oxidation of the propylthiol using H 2O 2 as oxidant during the synthesis process. Powder X-ray diffraction patterns and nitrogen sorption indicate the formation of well-ordered mesoporous material with uniform porosity. The highest acid-exchange capacity (acid–base titration methods) was 1.72 H + mmol/g. Complete oxidation of SH to SO 3H was observed as evidenced by X-ray photoelectron spectroscopy. For comparison, the sulfonic acid-functionalized mesoporous organosilicas were also prepared by a grafting method. The catalytic properties of the materials were investigated in liquid-phase condensation of phenol with acetone to form Bisphenol A. All sulfonic acid-functionalized mesoporous organosilicas show high catalytic activity. The highest TOF obtained for the mesoporous organosilica is 17.2.
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