Synthesis and Catalytic Activity of Highly Dispersed Solid Solutions Ce0.9Sn0.1O2 and Ce0.8Sn0.1Zr0.1O2 in CO Oxidation.

Autor: Simakina, E. A., Liberman, E. Yu., Kleusov, B. S., Kon'kova, T. V., Grunskii, V. N., Morozov, A. N., Denisenko, A. V.
Zdroj: Inorganic Materials: Applied Research; Dec2023, Vol. 14 Issue 5/6, p1435-1440, 6p
Abstrakt: Fluorite-like solid solutions of Ce0.9Sn0.1O2 and Ce0.8Sn0.1Zr0.1O2 were synthesized by coprecipitation using ammonium carbonate as a precipitant. The samples were characterized by X-ray powder diffraction analysis, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, low-temperature nitrogen adsorption, and gas chromatography. It was shown that the solid solutions are formed already at an annealing temperature of 550°C. In this process, platelike particles are formed, the size of which, according to SEM data, is 4 μm. The synthesized materials have a mesoporous structure. The specific surface areas of Ce0.9Sn0.1O2 and Ce0.8Zr0.1Sn0.1O2 samples are 80.6 and 76.3 m2/g, respectively. Calcination at a temperature of 800°C leads to an increase in the particle size up to 8–10 μm. The specific surface area after calcination is the highest (15.3 m2/g) for the Ce0.8Zr0.1Sn0.1O2 sample, which is due to the presence of zirconium ions in its composition. The synthesized materials demonstrated high activity in CO oxidation. The maximum catalytic activity was observed for the two-component system Ce0.9Sn0.1O2: T50% at 180°C and T90% at 236°C. Of the samples calcined at a temperature of 800°C, Ce0.8Zr0.1Sn0.1O2 is the most active, which is due to the formation of a more heat-resistant system in comparison with cerium dioxide and Ce0.9Sn0.1O2. To increase the thermal stability, it is advisable to dope the two-component material Ce0.9Sn0.1O2 with Zr+4 ions. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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