engleski

The preparation of manganese-doped ceria nanoparticles and their utilization for BTEX gas mixture oxidation

The commencement of ceria use for advanced catalytic applications took place a few decades ago and regardless of being widely used in catalysis, it is still being researched to improve its properties and catalytic efficiency. Besides in catalysis, owing to its fluorite structure and easy shift between Ce3+ and Ce4+ oxidation state, ceria utilization is investigated in solid oxide fuel cells and water purification membranes. Manganese, having multiple oxidation states, is assumed to improve many of CeO2 properties including catalytic activity. As a catalyst, ceria is mostly utilized as a part of exhaust gas oxidation catalyst in three-way automobile catalytic converters and soot oxidation catalysts in diesel particulate filters, as well as for the oxidation of volatile organic compounds. In this investigation ceria (CeO2) nanoparticles doped with manganese in various amounts were prepared via hydrothermal synthesis. The prepared samples were thermally treated at 500 °C for 2 hours to prevent change of properties in the course of catalytic test at elevated temperatures. Thermally treated samples were investigated via X-ray diffraction (XRD) and energy dispersive X-ray spectrometry (EDS) to determine the phase and elemental composition, while N2 adsorption- desorption isotherms were used for the determination of specific surface area. Finally, catalytic activity of the prepared catalyst was tested on benzene, toluene, ethylbenzene and o- xylene (BTEX) gas mix. It was established that doping of manganese into the ceria structure has noticeable benefits for the catalyst activity in BTEX oxidation process.

ceria ; ceramics ; nanoparticles ; BTEX

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