磺酸基官能化介孔材料的表征及其催化性能

由高水热稳定的巯基官能化介孔硅基材料经氧化得到磺酸基官能化介孔固体酸催化剂。经过一系列的表征测试,所得固体酸具有发达的孔道结构和大量Br尴nsted酸性位。将其应用于苯甲醛与醇类缩合反应中,与传统沸石固体酸催化剂HY相比,显示了更好的催化性能,缩醛收率在90%左右。所合成的磺酸基官能化介孔固体酸催化剂的催化性能基本不受醇类分子体积影响,具有很好的重复使用性能。

Characterization and Catalytic Performance of Sulfonic-functionalized Mesoporous Silica

The conversion of-SH groups on the pore surface of the mercapto-functionalized mesoporous silicas with high hydrothermal stability to-SO3H gave rise to a series of solid acidic catalysts.According to the results obtained from various characterizations,the resultant solid acidic catalysts were found to have well-developed pore systems and abundant Brφnsted acidic active sites.In comparison to traditional solid acidic catalyst of HY,the sulfonic-functionalized mesoporous silica showed superior catalytic performance in the reaction of acetalization between benzaldehyde and alcohols.Typically,yield of acetal was as high as 90%.Furthermore,such mesostructured solid acidic catalysts can be conveniently recycled without significant loss of activity.What is more important is that the catalytic performance of the mesostructured solid acidic catalysts is not sensitive to the bulk of alcohol.