Effect of Surface’s -NH_2 Modification and Outlet Embellishment of HMS on Immobilization of Salen-Mn Complex
LIAO Hui-ying1, FU Zai-hui2 (1. Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde Hunan 415000; 2. College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha Hunan 410081)
The Salen-Mn complex was immobilized on the hexagonal mesoporous silica (HMS) with surface's -NH2 group by three methods such as conventional, microwave and ultrasonic methods, and then made a modification to their outlets. The prepared catalysts were investigated by FT-IR and TG-DSC, and the Mn loading was determined by chemical complexometric titration. The catalytic performance of catalysts for E-stilbene epoxidation was studied.The results indicated that the HMS with surface’s NH2 could immobilize salen-Mn complex efficiently. Furthermore,modification of the outlet of HMS that immobilized salen-Mn complex could efficiently reduce the Mn leaching and enhance the selectivity for the epoxides.