Synthesis of hollow type mesoporous silica using NaA zeolite as a template cores and its application for anchoring the chiral catalyst

초록

Some recent research efforts have been paid to the synthesis of hollowtype mesoporous materials. This materials have been atrracted a interest because of their application in catalysis and the protection of biologically active agent.In this study, Hollow type mesoporous silica was synthesized using NaA Zeolite(NaA) as a template core. After removal of the NaA cores by hydrochloric acid, chiral Co(III) salen complexes were immobilized in the vacant cores through encapsulation treatment. The mesostructure of hollow silica was characterized by X-ray Diffractometer , Fe-TEM and SEM analysis. Chiral Co(III) salen complex was encapsulated in the mesoporous hollow silica. The activities of heterogeneous chiral salen catalysts were examined in the hydrolytic kinetic resolution (HKR) of epichlorohydrin (ECH). The conversion and ee% values were determined by capillary GC equipped with chiral columns (HP-225 50% cyanopropyl). The mesoporous hollow silica could be fabricated so easily by sacrificial method using NaA, and the samples obtained in this work was efficient support for immobilization of chiral Co- salen complexes. Keywords: Salen catalyst, Hollow type mesoporous silica