Hydrothermal Synthesis of Mixed Oxide Compositions of Cobalt‐Zirconium and their Catalytic Activity in the Decomposition of Hydrogen Peroxide

Cobalt-zirconia mixed oxide materials with improved catalytic properties were compared to individual oxides. The materials have a developed surface due to synthesis in hydrothermal conditions. The simultaneous production of cobalt and zirconium oxides has a beneficial effect on improving the properties of the material.

Abstract

The article presents the results of research on the hydrothermal synthesis of nanoscale oxide of cobalt and zirconium and their mixed oxide compositions. The synthesized samples have been characterized by the X-ray phase, scanning electron microscopy and nitrogen adsorption-desorption methods; the composition of the samples has been determined by chemical analysis methods, and their catalytic activity in the decomposition of hydrogen peroxide has been studied. It has been shown that during synthesis, highly dispersed cobalt and zirconium oxide are formed, and the sample of the composition (mol %): Co₃O₄(88)−ZrO₂(12) has the highest specific surface area (181.2 m²/g) and the highest activity (K=6.18 ⋅ 10⁻² s⁻¹) against the decomposition of hydrogen peroxide. The increasing of the ZrO₂ content in oxide compositions reduces their catalytic activity. The particle size in the synthesized samples is 7–38 nm.

Zum Volltext