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Catalytic combustion of methane over Pd containing perovskite type oxides

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2005
Authors
Petrović, Srđan
Karanovic, L
Stefanov, PK
Zdujić, Miodrag
Terlecki-Baričević, Ana V.
Article (Published version)
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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 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.

Keywords:
XPS / perovskite / catalytic combustion
Source:
Applied Catalysis B-Environmental, 2005, 58, 1-2, 133-141
Publisher:
  • Elsevier Science Bv, Amsterdam

DOI: 10.1016/j.apcatb.2004.11.020

ISSN: 0926-3373

WoS: 000229514800016

Scopus: 2-s2.0-18544382870
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/180
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IHTM

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