Synthesis and characterization of vanadium (IV) complexes in NaY zeolite supercages

被引：25

作者：

Kozlov, A

Asakura, K

Iwasawa, Y ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 113, Japan

[2] Univ Tokyo, Fac Sci, Res Ctr Spectrometry, Bunkyo Ku, Tokyo 113, Japan

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 1998年 / 21卷 / 4-6期

关键词：

ESR; picolinic acids; Schiff bases; XAFS; zeolite-encapsulated vanadium (4+) complexes;

D O I：

10.1016/S1387-1811(98)00028-6

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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), 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 H2O2 and t-BuOOH. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：571 / 579

页数：9