Ti—MCM—41的结构特征与芳烃羟化反应的化学亲和选择性

以不同硅源合成了Si/Ti比不同的Si-Ti－MCM－41，并在引入Ti的同时引入Al，合成了Si/Al比不同的Si-Ti-Al-MCM-41。XRD、TEM、低温N2吸附的表征结果说明，Ti-MCM-41具有长程有序一维孔道，且比表面积较高，FT－IR光谱表征说明，Ti对骨架Si的取代使MCM－41表面出现缺陷羟基。Al的引入有利于Ti-MCM-41有序结构的形成。且可调变Ti-MCM-41的表面性质。Ti-MCM-41在不同极性芳烃化合物的羟化过程中表现出化学亲和选择性，且调变Ti-MCM-41的表面性质可实现对化学亲和选择性的控制。

STRUCTURAL CHARACTERISTICS OF Ti-MCM-41 AND THE CHEMISTRY SELECTIVITY IN THE HYDROXYLATION OF BENZENE

Ti MCM 41 with different Si/Ti has been synthesized using various Si sources, and Al containing Ti MCM 41 with different Si/Al has also been obtained by inserting Al along with Ti The results obtained by XRD, TEM and N 2 adsorption at low temperature show that Ti MCM 41 possesses ordered one dimensional channels and high specific area, and the insertion of Al favors the formation of ordered structures The surface properties of MCM 41 are altered by the insertion of Ti and can be further modified through introducing Al Si Ti MCM 41 significantly favors the hydroxylation of benzene over the hydroxylation of phenol, thereby showing the potential for enhanced chemical selectivity for the hydroxylation of aromatics The hydroxylation of benzene takes place more readily with decreasing Al content and the hydroxylation of phenol proceeds more readily with increasing Al content, indicating that the chemistry selectivity can potentially be altered by changing the surface properties of the catalyst