Lanthanum cobaltite perovskite supported onto mesoporous zirconium dioxide: Nature of active sites of VOC oxidation
2011
Kustov, Alexander L. | Tkachenko, Olga P. | Kustov, Leonid M. | Romanovsky, Boris V.
Novel catalytic nano-sized materials based on LaCoOₓ perovskite nanoparticles incapsulated in the mesoporous matrix of zirconia were prepared, characterized by physicochemical methods and tested in complete methanol oxidation. LaCoOₓ nanoparticles were prepared inside the mesopores of ZrO₂ by decomposition of bimetallic La–Co glycine precursor complexes. The catalysts have been studied by diffuse-reflectance FTIR-spectroscopy using such probe molecules as CO, CD₃CN and CDCl₃ to test low-coordinated metal ions. At low temperatures of decomposition of complexes (up to 400°C), low-coordinated Co³⁺ ions predominate in the LaCoOₓ nanoparticles, whereas basically Co²⁺ ions are found upon increasing the decomposition temperature to 600°C. The novel nano-sized perovskite catalysts exhibit a very high catalytic activity in the abatement of volatile organic compounds present in air, like methanol and light hydrocarbons.
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