Cu修饰的MCM-41的合成、表征及对芳烃羟化反应催化作用的研究

利用MCM-41形成过程中协同自组装的特点,在合成过程中引入Cu(NH₃)₄²⁺,制备出过渡金属表面修饰的纯硅介孔分子筛Cu-MCM-41,采用XRD,ICP,ESR,N₂吸附等手段确定Cu处于MCM-41的表面,取代了端羟基中氢的位置,与骨架桥氧和硅羟基中的氧配位.利用苯酚羟化反应为探针,考察了Cu-MCM-41的催化活性.结果表明,Cu-MCM-41具有很高的苯酚羟化活性,与TS-1分子筛的催化效果相当,对萘酚的羟化活性也较高.

Preparation, Characterization of Cu-MCM-41 and Its Catalysis for Hydroxylation of Aromatic Compounds

Pure silica MCM-41 with surface grafted Cu²⁺ ions(donated as CuMCM-41) was synthesized via a novel co-assemble route; XRD, ESRand ion-exchange studies revealed that the copper was located on the surface of the pure silica MCM-41 and coordinated with bridged oxygen in the framework. In addition, we also studied its catalysis behavior for hydroxylation of phenol and naphthol with hydrogen peroxide as the oxygen donor. The experimental results show that Cu-MCM-41 possesses an excellent catalytic activity compared with other catalysts Cu-AlMCM-41 and CuO-MCM-41.