Oxygen storage capacity and structural properties of Ni-doped LaMnO 3 perovskites

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Rui Ran
  • Xiaodong Wu
  • Duan Weng
  • Jun Fan

Detail(s)

Original languageEnglish
Pages (from-to)288-294
Journal / PublicationJournal of Alloys and Compounds
Volume577
Publication statusPublished - 2013
Externally publishedYes

Abstract

A series of Ni doped LaMnO3 perovskites were prepared by a sol-gel method as oxygen storage materials. Powder X-ray diffraction (XRD), X-ray adsorption fine structure (XAFS), oxygen storage capacity (OSC) and H 2-temperature program reduction (TPR) measurements were performed to investigate the OSC of the perovskites as well as the effects of Ni on the structural properties. The results showed that the Ni-doped LaMnO3 perovskite exhibited very large dynamic OSC and high oxygen release rate, which provided a possibility to serve as an oxygen storage material candidate in three-way catalysts. The available oxygen species below 500 °C primarily originated from the redox reaction between Mn4+ and Mn3+, and the more Mn4+ were favourable to the releasable oxygen. The doping of appropriate Ni ions promoted the OSC of the LaMnO3 perovskites by increasing the Mn4+ content and adjusting the structural defects. On the other hand, the doped Ni ions could make the BO6 distortion disappearing in the LaMnO3 perovskites to reduce the lattice oxygen activity. © 2013 Elsevier B.V. All rights reserved.

Research Area(s)

  • BO6 distortion, Oxygen storage capacity (OSC), Oxygen vacancy, Perovskites

Citation Format(s)

Oxygen storage capacity and structural properties of Ni-doped LaMnO 3 perovskites. / Ran, Rui; Wu, Xiaodong; Weng, Duan; Fan, Jun.

In: Journal of Alloys and Compounds, Vol. 577, 2013, p. 288-294.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review