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首次研究了含羟基的HMS(c)和含十四胺模板剂的HMS(u)以及用 3 氨丙基三乙氧基硅烷改性的HMS(m)三种中孔载体与Ti(OiPr) 4的交换反应规律 ,发现载体表面官能团对交换反应有明显影响 .对HMS(c) ,在低温交换下可获得更高的钛交换量 ,提高交换温度钛交换量反而下降 ;对HMS(u)和HMS(m) ,则是随交换温度的升高 ,钛交换量增加 .这表明含羟基的载体比含氨基的载体更易与Ti(OiPr) 4交换 ,交换温度会影响Ti(OiPr) 4与HMS(c)表面羟基作用的数目 ,对含氨基载体则无此影响 .苯乙烯环氧化结果表明 ,用HMS(c)组装的钛催化剂氧化活性最高 ,以HMS(u)组装的钛催化剂环氧化选择性最好 .氨基和酒石酸二乙酯 (DET)配体对钛活性中心的调变作用会造成其活性下降 ,而选择性上升
For the first time, three kinds of mesoporous mesoporous materials, HMS (c) with hydroxyl group, HMS (u) with tetradecylamine templating agent and HMS (m) modified with 3aminopropyltriethoxysilane, 4 exchange reaction, it was found that the surface functional groups on the support had a significant effect on the exchange reaction.For HMS (c), higher exchange capacity of titanium was obtained under low temperature exchange, And HMS (m), the exchange capacity of titanium increases with the increase of exchange temperature.This indicates that the hydroxyl-containing supports are easier to exchange with Ti (OiPr) 4 than the support containing amino groups, and the exchange temperature will affect the Ti (OiPr) 4 and The number of hydroxyl groups on the surface of HMS (c) had no effect on the carrier containing amino groups.The epoxidation of styrene showed that the titanium catalyst assembled with HMS (c) had the highest oxidation activity and the HMS (u) assembled titanium catalyst ring Oxidation selectivity of the best.Amino and diethyl tartrate (DET) ligand activity of the titanium center of the modulation effect will result in decreased activity, and selectivity increased