Guralsky A. Сatalytic properties of oxide copper-ceria-zirconia systems in the preferential oxidation process of carbon monoxide admixtures in hydrogen environment

The thesis is devoted to the influence of the components of oxide copper-ceria-zirconia systems on their catalytic properties in preferential carbon monoxide oxidation reaction in hydrogen environment. The investigations of structural and textural characteristics of the initial supports, and their catalytic properties in CO oxidation reaction found that with increasing temperature of calcination from 300 to 1000 C the fusion of defective nanoparticles is with a lot of grain boundaries, which also makes high catalytic activity of such materials in CO oxidation reaction. It is shown that regardless of the structural and textural characteristics of zirconia, resulting in deposition on the carrier are formed almost the same size nanoparticles of active components in the case of copper oxide (~ 30 nm) and cerium dioxide (~ 10 nm). It was demonstrated that the application of cerium-ammonium nitrate as cerium precursor is formed more defective cerium dioxide, which has a large number of oxygen vacancies in the structure, leading to increased activity of copper-ceria-zirconia catalysts in the CO oxidation reaction in hydrogen rich gas mixtures. It is established that the catalytic properties, including CO conversion and preferential selectivity, of the deposited on zirconia copper-cerium systems determined by the support's structure and dispersion: The highest conversion and preferential selectivity observed on samples of catalysts coated on zirconia, which is calcined at a temperature 1000 C and is characterized by low specific surface area and the largest size of nanoparticles.