The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at abou...t 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.
TY - JOUR
AU - Petrović, Srđan
AU - Karanovic, L
AU - Stefanov, PK
AU - Zdujić, Miodrag
AU - Terlecki-Baričević, Ana V.
PY - 2005
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/180
AB - The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at about 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.
PB - Elsevier
T2 - Applied Catalysis B-Environmental
T1 - Catalytic combustion of methane over Pd containing perovskite type oxides
VL - 58
IS - 1-2
SP - 133
EP - 141
DO - 10.1016/j.apcatb.2004.11.020
ER -
@article{
author = "Petrović, Srđan and Karanovic, L and Stefanov, PK and Zdujić, Miodrag and Terlecki-Baričević, Ana V.",
year = "2005",
abstract = "The mixed perovskite type oxides with nominal formula LaTi0.5Mg0.5-xPdxO3, (0 LT = x LT = 0.10) were prepared by anneling the ethanol solution of precursor in nitrogen flow at 1200 degrees C. X-ray powder diffraction (XRPD) analysis shows that the orthorhombic perovskite structure was found in all investigated samples. However, at least a part of palladium is not incorporated into perovskite structure and remains as separate phase, which is reduced to Pd-0 at 1200 degrees C. X-ray photoelectron spectroscopy (XPS) reveled the presence of Pd2+, which indicate a reoxidation of Pd-0 in the surface layers during cooling. The Pd content in the samples has a small influence on the methane oxidation activity below the temperature of 500 degrees C. At temperatures higher than 500 C, the methane oxidation activity of the sample with x = 0.05 exceeds the activity of the sample with x = 0.10. The sharp increase of methane oxidation activity over the sample with lower content of palladium at about 500 degrees C was ascribed to the higher dispersion of PdO and Pd-0 phases. Thus, the higher contribution of lattice oxygen and possible local change in oxidation state of palladium can be a reason for the enhanced activity. Contrary to the supported Pd/Al2O3 catalyst, the incorporation of palladium into perovskite matrix and interaction of PdO-Pd-0 benefits the activity of smaller particles at higher reaction temperatures.",
publisher = "Elsevier",
journal = "Applied Catalysis B-Environmental",
title = "Catalytic combustion of methane over Pd containing perovskite type oxides",
volume = "58",
number = "1-2",
pages = "133-141",
doi = "10.1016/j.apcatb.2004.11.020"
}
Petrović, S., Karanovic, L., Stefanov, P., Zdujić, M.,& Terlecki-Baričević, A. V.. (2005). Catalytic combustion of methane over Pd containing perovskite type oxides. in Applied Catalysis B-Environmental
Elsevier., 58(1-2), 133-141.
https://doi.org/10.1016/j.apcatb.2004.11.020
Petrović S, Karanovic L, Stefanov P, Zdujić M, Terlecki-Baričević AV. Catalytic combustion of methane over Pd containing perovskite type oxides. in Applied Catalysis B-Environmental. 2005;58(1-2):133-141.
doi:10.1016/j.apcatb.2004.11.020 .
Petrović, Srđan, Karanovic, L, Stefanov, PK, Zdujić, Miodrag, Terlecki-Baričević, Ana V., "Catalytic combustion of methane over Pd containing perovskite type oxides" in Applied Catalysis B-Environmental, 58, no. 1-2 (2005):133-141,
https://doi.org/10.1016/j.apcatb.2004.11.020 . .
