Preparation and characterization of Pd/Beta zeolite with a hierarchical pore structure by using KIT-6 and trimethoxy silyl propanthiol: an efficient acid-metal bi-functional catalyst for the one-pot C-N bond reaction

Palladium nanoparticles supported on hierarchical Beta zeolite (Pd/H-Beta) was evaluated as a novel acid-metal bi-functional heterogeneous catalyst. Hierarchical Beta zeolite was synthesized by an indirect method from KIT-6 as a silica source and trimethoxy silyl propanthiol as a crystal size controlling. Moreover, trimethoxy silyl propanthiol was used as an agent in the regularization of the mesopores. It also increases the surface area of the Beta zeolite. The structural and morphological characterization of the prepared catalysts was investigated using XRD, BET, ICP, FT-IR, SEM, and DRS UV techniques. . This zeolite possesses large surface area (742.19 m2/g) and mesoporous volume (0.55 cm3/g) resulted from the formation of intercrystalline mesopores and the small crystal size. The catalyst has been applied to the one-pot C-N bond formation reaction and demonstrated high catalytic activity even after several times.