Abstract
Encapsulated vanadium complexes with various pyridine-2-carboxylic acids and Schiff bases were synthesized from a dehydrated form of VO(2+)-NaY zeolite by a flexible ligand method and a template synthesis method. It was suggested by X-ray powder diffraction and X-ray photoelectron spectroscopy that the complexes were located in the zeolite supercages. Detailed characterization of the vanadium species was performed by XAFS, FT-IR, ESR and UV-vis spectroscopies in comparison with the corresponding free complexes and reference samples prepared by an impregnation method. Difference in spectroscopic features of the encapsulated and impregnated VO(pic) 2 samples was explained in terms of coordination of zeolite -OH groups to the vanadium complexes. The encapsulated vanadium complexes were active for catalytic selective oxidation of hydrocarbons with H 2O 2 and t-BuOOH.
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