Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Genesis and structural properties of (Ce1–x Mx0.8Ni0.2O y (M = La, Mg) oxides. / Matus, E. V.; Ismagilov, I. Z.; Ushakov, V. A. и др.
в: Journal of Structural Chemistry, Том 61, № 7, 01.07.2020, стр. 1080-1089.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Genesis and structural properties of (Ce1–x Mx0.8Ni0.2O y (M = La, Mg) oxides
AU - Matus, E. V.
AU - Ismagilov, I. Z.
AU - Ushakov, V. A.
AU - Nikitin, A. P.
AU - Stonkus, O. A.
AU - Gerasimov, E. Yu
AU - Kerzhentsev, M. A.
AU - Bharali, P.
AU - Ismagilov, Z. R.
N1 - The work was supported by RFBR (project No. 18-53-45012 IND_a).
PY - 2020/7/1
Y1 - 2020/7/1
N2 - 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.
AB - 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.
KW - cerium dioxides
KW - electron microscopy
KW - nanomaterials
KW - powder X-ray diffraction analysis
KW - Raman spectroscopy
KW - solid solutions
KW - NICKEL
KW - HYDROGEN-PRODUCTION
KW - GD
KW - CATALYTIC PERFORMANCE
UR - http://www.scopus.com/inward/record.url?scp=85090233434&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/9a56bca0-11ee-3011-a91c-520a435448d0/
U2 - 10.1134/S0022476620070100
DO - 10.1134/S0022476620070100
M3 - Article
AN - SCOPUS:85090233434
VL - 61
SP - 1080
EP - 1089
JO - Journal of Structural Chemistry
JF - Journal of Structural Chemistry
SN - 0022-4766
IS - 7
ER -
ID: 25287670