High-Performance Microwave Synthesized Mesoporous TS-1 Zeolite for Catalytic Oxidation of Cyclic Olefins

A distinctive mesoporous titanium silicalite-1 (TS-1) was prepared by microwave-assisted postsynthetic treatment with H2O2 to generate hierarchical pore structure. For comparison, mesoporous TS-1 was also prepared with alkali or fluoride postsynthetic treatment. Synthesized catalysts were characterized by various techniques, namely, XRD, XPS, FTIR, UV–vis DRS, and others and evaluated for oxidation of cyclic olefins. The post-treated TS-1 with H2O2 and microwave irradiation exhibited a high catalytic activity in comparison to the parent TS-1. Both microwave irradiation time and temperature during postsynthetic treatment showed influence on the oxidation activity of the catalyst. The H2O2 coupled microwave irradiation generated mesoporosity in the microporous TS-1 crystals and improved its catalytic activity by the creation of external Ti species located on the TS-1 surface. Alkali or fluoride postsynthetic treated TS-1 catalysts also exhibited similar activity with that of H2O2 post-treated sample. In particular, the mesoporous TS-1 samples exhibited prominent shape selectivity in the oxidation of cyclododecene bulky molecule.