Synthesis, characterization and catalytic properties of titanium and boron co-substituted silicalite zeolites

Titanium and boron co-substituted silicalite-2 (TBS-2) has been synthesized by using TBAOH as a templating agent in hydrothermal conditions. The main factors affecting Ti and B co-incorporated into the framework of silicalite-2 (S-2) such as the used amounts of H2O2 (for dissolving hydrous Ti oxides) and H3BO3 (used as boron source) and the addition of TMAOH were studied in detail. XRD, FT-IR, SEM, and NH3-TPD, were used to characterize the influences of Ti and B co-incorporation on the unit cell parameters of S-2, framework IR bands, crystalline morphology, and acid properties, respectively. The epoxidation of styrene and the rearrangement of styrene oxide were respectively used to check the oxidative and acidic catalytic properties of TBS-2. (C) 1999 Elsevier Science B.V. All rights reserved.