Preparation and Catalytic Property of Periodic Mesoporous Organosilica Materials with Sulfonic Acid inside the Framework

摘要

Periodic mesoporous organosilicas (PMO) containing a variety of organic groups, such as ethane, ethane, benzene and thiophene, resides inside the wall of the material were the latest innovation in the field of mesoporous materials. This new development is the result of combining the self-assembly approach for making ordered mesoporous materials, and the use of bridged silsesquioxanes, which have been known as precursors in sol-gel chemistry. The presence of organic groups within the frameworks of PMO materials is expected to give these materials a lot of favorable properties and applications. There are only two papers about the direct modification of organic groups. These results proved that the organic functional groups incorporated in the framework of PMO are also accessible for chemical manipulations and introduction of various functional groups via classical organic reactions. In previous work, we report the surface modification of PMO with organo-sulfonic acid group and catalytic application for the alkylation of phenol with 2-propanol, which showed higher activity than zeolites and higher hydrothermal stability than mesoporous silica material MCM-41 functionalized with sulfonic acid group. In this work, our research is focus on the modification and catalytic application of organic group inside the wall of PMO materials. To compare with the surface modification of PMO material, alkylation of phenols with tert-buthanol was chosen as the model reaction.