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TECHNICAL PAPERS

A Temperature-Programmed-Reduction Study on La1xSrxCrO3 and Surface-Ruthenium-Modified La1xSrxCrO3

[+] Author and Article Information
Aiyu Yan, Bin Liu, Baofeng Tu

Fuel Cell R&D Center,  Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China and  Graduate Schools of the Chinese Academy of Sciences, Beijing, 100039, P. R. China

Yonglai Dong

Fuel Cell R&D Center,  Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China

Mojie Cheng

Fuel Cell R&D Center,  Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. Chinamjcheng@dicp.ac.cn

Shuqin Song

Department of Mechanical Engineering, School of Engineering,  University of Thessalia, Pedion Areos, 383 34 Volos, Greece

Panagiotis Tsiakaras

Department of Mechanical Engineering, School of Engineering,  University of Thessalia, Pedion Areos, 383 34 Volos, Greecetsiak@mie.uth.gr

J. Fuel Cell Sci. Technol 4(1), 79-83 (Jun 13, 2006) (5 pages) doi:10.1115/1.2393308 History: Received November 30, 2005; Revised June 13, 2006

A series of La1xSrxCrO3(0x0.3) composite oxides were prepared by a modified citric method. These perovskite oxides were further modified with Ru through impregnation. X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and temperature-programmed-reduction (TPR) techniques were adopted to investigate the properties of both the as-prepared perovskite oxides and the surface-Ru-modified La1xSrxCrO3 samples. XPS results indicated the existence of Cr6+ ions in the fresh samples and transformed to Cr3+ after reduction. The hydrogen consumed by these perovskite oxides during TPR increased with the Sr doping, which was more than twice of the theoretical value according to Kröger-Vink notation. The reduction temperature of Cr ions of RuLa1xSrxCrO3 significantly decreased with an increase of the Ru loading. A small reduction peak at 540°C, which was not shifted by increasing Ru loadings, was observed and could be ascribed to the reduction of trace chromate phases. On all TPR profiles of the three doped perovskites with unity of the A-site and B-site ratio, the reduction of Ru species could not be observed at low Ru loadings (0.05% and 0.1%). A reduction peak from RuO2 particles appeared at temperatures prior to the perovskite reduction on the TPR plots of modified La0.9Sr0.1CrO3 and La0.8Sr0.2CrO3 with high Ru loading (0.5% and 1%, respectively), but it did not occur with the Ru modified La0.7Sr0.3CrO3 in the investigated Ru loading range. The TPR results of the Ru modified La0.8Sr0.2Cr0.95O3 depicted that some Ru ions might be stabilized due to the incorporation into the oxide.

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Figures

Grahic Jump Location
Figure 1

XRD patterns of La1−xSrxCrO3. (a) LaCrO3; (b) La0.9Sr0.1CrO3; (c) La0.8Sr0.2CrO3; (d) La0.7Sr0.3CrO3.

Grahic Jump Location
Figure 2

XPS spectra of the Cr2p level in the system of La1−xSrxCrO3. —Fresh samples; ⋯⋯Reduced samples.

Grahic Jump Location
Figure 3

TPR profiles of La1−xSrxCrO3. (a) LaCrO3; (b) La0.9Sr0.1CrO3; (c) La0.8Sr0.2CrO3; (d) La0.7Sr0.3CrO3.

Grahic Jump Location
Figure 4

TPR profiles of Ru∕La1−xSrxCrO3 samples with various Ru loadings. (a) Ru∕La0.9Sr0.1CrO3; (b) Ru∕La0.8Sr0.2CrO3; (c) Ru∕La0.7Sr0.3CrO3; (d) Ru∕La0.8Sr0.2Cr0.95O3.

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