Genesis and structural properties of (Ce1–x Mx0.8Ni0.2O y (M = La, Mg) oxides

E. V. Matus, I. Z. Ismagilov, V. A. Ushakov, A. P. Nikitin, O. A. Stonkus, E. Yu Gerasimov, M. A. Kerzhentsev, P. Bharali, Z. R. Ismagilov

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Abstract

The genesis and structural properties of (Ce1–xMx)0.8Ni0.2Oy (M = La, Mg; x = 0, 0.2, 0.5, 0.8, 1; 1.0 ≤ y ≤ 1.8) oxides that are promising catalyst precursors are studied. A complex of physicochemical methods (low-temperature nitrogen adsorption, ex situ and in situ powder X-ray diffraction, electron microscopy, Raman spectroscopy, and EDX analysis) is used to show that after the calcination at 500 °C in the oxidizing medium, (Ce1–xMx)0.8Ni0.2Oy become mesoporous materials representing substitutional solid solutions with a cubic fluorite-type structure with supported particles of the Ni-containing phase. When M = La, Ni cations are mainly stabilized in the composition of the Ce–La–Ni–O solid solution, and when M = Mg, they are stabilized in the Mg–Ni–O composition. It is found that La- or Mg-containing samples, as compared to Ce0.8Ni0.2Oy, have highly defective structures and smaller sizes of crystallites (≤ 4 nm, x ≥ 0.5). After thermal treatment of the samples in H2/Не at 800 °C, highly dispersed Ni° particles with a size of 5-10 nm are formed. Metal particles have defects and a polycrystal structure, and they are readily reoxidized in air with the formation of “core@shell” Ni@NiO structures.

Original languageEnglish
Pages (from-to)1080-1089
Number of pages10
JournalJournal of Structural Chemistry
Volume61
Issue number7
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • cerium dioxides
  • electron microscopy
  • nanomaterials
  • powder X-ray diffraction analysis
  • Raman spectroscopy
  • solid solutions
  • NICKEL
  • HYDROGEN-PRODUCTION
  • GD
  • CATALYTIC PERFORMANCE

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