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Hexagonal YFe1−xPdxO3−δ: Nonperovskite Host Compounds for Pd2+ and Their Catalytic Activity for CO Oxidation

Published

Author(s)

Jun Li, Udayshankar G. Singh, Thomas D. Schladt, Judith K. Stalick, Susannah L. Scott, Ram Seshadri

Abstract

Metastable YFeO3 with the hexagonal YAlO3 structure was obtained by a sol−gel process at 700 °C, using metal nitrate precursors with pH control and the appropriate citric acid to nitrate ratio. Under similar conditions, YFe1−xPdxO3−δ (0 < x ≤ 0.1) compositions were also prepared. The substitution of Fe by Pd stabilizes the YAlO3 structure at higher temperatures. The crystal structures of YFe1−xPdxO3−δ (0 ≤ x ≤ 0.1) were refined by Rietveld analysis of X-ray and neutron powder diffraction data. The parent hexagonal YFeO3 (x = 0) crystallizes in the space group P63/mmc with a = 3.5099(3) Å and c = 11.759(2) Å. The redox-driven mobility of Pd to integrate into the oxide host as ions and to dissociate from it as fcc-Pd nanoparticles was monitored by a combination of X-ray diffraction and X-ray photoelectron spectroscopy. Pd nanoparticles in the reduced samples were detected by scanning backscattered electron microscopy and transmission electron microscopy. The Pd2+-containing materials showed significant low-temperature (near 100 °C) catalytic activity for CO oxidation, comparable to that of highly dispersed PdO/Al2O3, despite their relatively low surface areas.
Citation
Chemistry of Materials
Volume
20
Issue
20

Keywords

catalysis, nanoparticles, neutron diffraction

Citation

Li, J. , Singh, U. , Schladt, T. , Stalick, J. , Scott, S. and Seshadri, R. (2008), Hexagonal YFe1&#8722;xPdxO3&#8722;&#948;: Nonperovskite Host Compounds for Pd2+ and Their Catalytic Activity for CO Oxidation, Chemistry of Materials, [online], https://doi.org/10.1021/cm801534a, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=610060 (Accessed April 19, 2024)
Created September 25, 2008, Updated March 18, 2024