Tungstocobaltate-pillared layered double hydroxides: Preparation, characterization, magnetic and catalytic properties

摘要

A new polyoxometalate anion-pillared layered double hydroxide (LDH) was prepared by aqueous ion exchange of a Mg-Al LDH precursor in nitrate form with the tungstocobaltate anions [CoW12O40](5-). The physicochemical properties of the product were characterized by the methods of powder X-ray diffraction, elemental analysis, infrared spectroscopy, thermogravimetric analysis and cyclic voltammetry. It was confirmed that [CoW12O40](5-) was intercalated between the brucite-type layers of the LDHs without a change in the Structure. Magnetic measurement shows the occurrence of antiferromagnetic interactions between the magnetic centers. The investigation of catalytic performance for this sample exhibits high activity for the oxidation of benzaldehyde by hydrogen peroxide. (c) 2008 Elsevier Inc. All rights reserved.