TY - JOUR
T1 - Synthesis of superficially modified Ce1-x(Zr + Y)xO2-δ solid solutions and thermogravimetric analysis of their performance in the catalytic soot combustion
AU - Téllez-Salazar, W. N.
AU - Fabián-Anguiano, J. A.
AU - Ovalle-Encinia, O.
AU - Zeifert, B. H.
AU - Ezeta-Mejía, A.
AU - Romero-Ibarra, I. C.
AU - Ortiz-Landeros, J.
N1 - Publisher Copyright:
© 2021 The Author(s).
PY - 2021/1
Y1 - 2021/1
N2 - 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.
AB - 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.
KW - Catalytic soot combustion
KW - CeO2
KW - Citrate-EDTA complexing method
KW - Co-doping
KW - FeO
UR - http://www.scopus.com/inward/record.url?scp=85100183111&partnerID=8YFLogxK
U2 - 10.1088/2053-1591/abd663
DO - 10.1088/2053-1591/abd663
M3 - Artículo
AN - SCOPUS:85100183111
SN - 2053-1591
VL - 8
JO - Materials Research Express
JF - Materials Research Express
IS - 1
M1 - abd663
ER -