Methane abatement under stoichiometric conditions on perovskite-supported palladium catalysts prepared by flame spray synthesis

Lu, Ye; Michalow, Katarzyna A.; Matam, Santhosh Kumar; Winkler, Alexander; Maegli, Alexandra E.; Yoon, Songhak; Heel, Andre; Weidenkaff, Anke; Ferri, Davide

doi:10.1016/j.apcatb.2013.08.001

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Methane abatement under stoichiometric conditions on perovskite-supported palladium catalysts prepared by flame spray synthesis
Authors:	Lu, Ye Michalow, Katarzyna A. Matam, Santhosh Kumar Winkler, Alexander Maegli, Alexandra E. Yoon, Songhak Heel, Andre Weidenkaff, Anke Ferri, Davide
DOI:	10.1016/j.apcatb.2013.08.001
Published in:	Applied Catalysis B: Environmental
Volume(Issue):	144
Page(s):	631
Pages to:	643
Issue Date:	2014
Publisher / Ed. Institution:	Elsevier
ISSN:	0926-3373
Language:	English
Subjects:	Perovskite-type oxides; Palladium; Flame spray synthesis (FSS); Methane oxidation; Stoichiometric conditions
Subject (DDC):	540: Chemistry
Abstract:	Three-way catalysts (TWC) are the key technology to reduce emissions of pollutants from stoichiometric engines. Perovskite-type catalysts of general formula ABO3±δ (A = La, Y; B = Mn, Fe) containing 2 wt% Pd were produced by flame spray synthesis (FSS) using metal nitrate precursors. The structural properties of the catalysts were characterized by X-ray diffraction (XRD), surface area determination (BET) and transmission electron microscopy (TEM). Crystalline metal oxide nano-particles of 20 nm average size were accompanied by minority La2O3 and Y2O3 phases. The state of Pd in the catalysts was characterized using X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge spectroscopy (XANES) and CO adsorption by infrared spectroscopy. Metallic Pd coexisted with Pd in oxidation state +2 and higher on all fresh samples. TEM confirmed the presence of dispersed Pd particles 2-5 nm in diameter. Therefore, under the chosen synthesis conditions, FSS provides supported palladium nano-particles rather than a solid solution. PdO was the dominant Pd species after calcination at 700 °C. The TWC activity was tested in a simulated stoichiometric gas mixture comprising CH4, CO, NOx and O2. PdO in combination with YFeO3±δ exhibited the lowest temperature for CH4 oxidation (T50 = 450°C), which was ca. 100°C lower than that of the sample obtained by the conventional wet-chemical method. After cycling under reaction conditions up to 850°C, a large improvement of catalytic activity for CH4 oxidation was observed which associated with the formation of metallic Pd particles (ca. 20 nm) and the hexagonal → orthorhombic phase transition of YFeO3±δ.
URI:	https://digitalcollection.zhaw.ch/handle/11475/9062
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Materials and Process Engineering (IMPE)
Appears in collections:	Publikationen School of Engineering

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Lu, Y., Michalow, K. A., Matam, S. K., Winkler, A., Maegli, A. E., Yoon, S., Heel, A., Weidenkaff, A., & Ferri, D. (2014). Methane abatement under stoichiometric conditions on perovskite-supported palladium catalysts prepared by flame spray synthesis. Applied Catalysis B: Environmental, 144, 631–643. https://doi.org/10.1016/j.apcatb.2013.08.001

Lu, Y. et al. (2014) ‘Methane abatement under stoichiometric conditions on perovskite-supported palladium catalysts prepared by flame spray synthesis’, Applied Catalysis B: Environmental, 144, pp. 631–643. Available at: https://doi.org/10.1016/j.apcatb.2013.08.001.

Y. Lu et al., “Methane abatement under stoichiometric conditions on perovskite-supported palladium catalysts prepared by flame spray synthesis,” Applied Catalysis B: Environmental, vol. 144, pp. 631–643, 2014, doi: 10.1016/j.apcatb.2013.08.001.

LU, Ye, Katarzyna A. MICHALOW, Santhosh Kumar MATAM, Alexander WINKLER, Alexandra E. MAEGLI, Songhak YOON, Andre HEEL, Anke WEIDENKAFF und Davide FERRI, 2014. Methane abatement under stoichiometric conditions on perovskite-supported palladium catalysts prepared by flame spray synthesis. Applied Catalysis B: Environmental. 2014. Bd. 144, S. 631–643. DOI 10.1016/j.apcatb.2013.08.001

Lu, Ye, Katarzyna A. Michalow, Santhosh Kumar Matam, Alexander Winkler, Alexandra E. Maegli, Songhak Yoon, Andre Heel, Anke Weidenkaff, and Davide Ferri. 2014. “Methane Abatement under Stoichiometric Conditions on Perovskite-Supported Palladium Catalysts Prepared by Flame Spray Synthesis.” Applied Catalysis B: Environmental 144: 631–43. https://doi.org/10.1016/j.apcatb.2013.08.001.

Lu, Ye, et al. “Methane Abatement under Stoichiometric Conditions on Perovskite-Supported Palladium Catalysts Prepared by Flame Spray Synthesis.” Applied Catalysis B: Environmental, vol. 144, 2014, pp. 631–43, https://doi.org/10.1016/j.apcatb.2013.08.001.