engleski

Combustion synthesis of zirconium doped CeO2

Zirconium doped ceria is a promising catalytic material extensively researched and used in three-way catalytic converters, oxidation of volatile organic compounds (VOCs), solid oxide fuel cells, etc., owning to its high oxygen storage and release capacity, high reduction properties and thermal stability. In this work, pure and zirconium doped ceria nanoparticles (Ce1-xZrxO2, where x = 0, 0.1, 0.2 and 0.3) were prepared by combustion synthesis using glycine as fuel and cerium and zirconium nitrate as oxidants. The obtained powders were characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), differential thermal and thermogravimetric analysis (DTA-TGA) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The catalytic activity of the prepared nanocatalysts was tested in the VOCs oxidation process. The combustion temperature increased with the increase of zirconium content in the samples, while the XRD patterns show solely ceria diffraction peaks. The crystallite sizes are in the range from 25.2 to 11.7 nm, and they do not change significantly after thermal treatment at 500 °C for 2 hours, indicating good thermal stability of the prepared samples. SEM analysis showed that the obtained samples are very porous. The ceria sample with 10 mol. % of zirconium exhibited the best catalytic activity in the VOCs oxidation process.

ceria ; zirconium ; combustion synthesis ; catalysis

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