In this work, solid solutions of general formula Ce1−x(Zr + Y)xO2−δ
were chemically synthesized through the so-called citrate-EDTA complexing method, wherein the doping cations Zr and Y were substituted in the ceria lattice with an equimolar amount of 0.05 ≤ x ≤ = 0.25. The ternary oxides were heat-treated, and those that showed the best textural properties were superficially impregnated with Fe2O3 particles by the thermal decomposition method using a metalorganic precursor. The X-ray diffraction results suggest that co-doping with Zr4+ and Y3+ promotes a slight distortion of the CeO2 cubic cell. Nevertheless, the fluorite cubic structure of the oxides remains stable after being exposed to heat treatments. Furthermore, using scanning electron microscopy and Raman techniques, the presence of deposited Fe2O3 and the formation of extrinsic vacancies in the materials could be corroborated. Finally, the oxides’ catalytic evaluation in the soot oxidation reaction was carried out using the thermogravimetry technique. The ternary oxide with cerium molar content equal to 0.9 and impregnated with Fe2O3 presented excellent catalytic behavior for soot oxidation. T10, T50, and T90 temperatures were 310, 383, and 416 °C, respectively.
The fluorite/perovskite composite with general formula Ce 0.9 Pr 0.1 O 2−δ /Pr 0.6 Sr 0.4 Fe 0.5 Co 0.5 O 3−δ was chemically synthesized by the citrate-EDTA method and subsequent calcination. First, the microstructural and textural properties of the ceramic powder were determined by several techniques such as XRD, N 2 physisorption, SEM, and TEM. Then the catalyst was loaded with Co as a promoter phase. Next, the catalytic evaluations were performed using thermogravimetric analysis to determine the combustion temperature of soot. Moreover, a series of cyclic analyses were carried out to evaluate the thermal stability of the catalyst. Based on the thermogravimetry data, the kinetic parameters of the catalytic soot combustion process were obtained.
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