Cation Distribution in Cu(Cr2 – xAlx)O4 and Cu(Fe2 – xAlx)O4 According to Neutron-Diffraction Studies and Their Catalytic Properties in the Water-Gas Shift Reaction
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Переводная
|
| Журнал |
Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques
ISSN: 1027-4510
, E-ISSN: 1819-7094
|
| Вых. Данные |
Год: 2016,
Том: 10,
Номер: 6,
Страницы: 1172-1179
Страниц
: 8
DOI:
10.1134/S102745101605058X
|
| Ключевые слова |
activation energy, Cu(Cr2 − xAlx)O4 and Cu(Fe2 − xAlx)O4 spinels, neutron diffraction, water-gas shift reaction |
| Авторы |
Plyasova L.M.
1
,
Minyukova T.P.
1
,
Yurieva T.M.
1
,
Bobrikov I.A.
2
,
Balagurov A.M.
2
|
| Организации |
| 1 |
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
|
| 2 |
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, 141980 Russia
|
|
Информация о финансировании (2)
|
1
|
Российский фонд фундаментальных исследований
|
13-03-00469
|
|
2
|
Российский фонд фундаментальных исследований
|
14-29-04091
|
The neutron structural analysis of Cu(Cr2 − xAlx)O4 and Cu(Fe2 − xAlx)O4 (0 ≤ x ≤ 2) nanopowders is performed. The samples are prepared by the thermal decomposition of mixed hydroxy compounds at 900°C. Different spinel phases are shown to form in Cu(Cr2 − xAlx)O4: a tetragonally distorted phase when x ≤ 1.0, a cubic phase when x > 1.25, and a mixture of both phases when 1 < x < 1.25. As Al3+ ions substitute Cr3+ ions, a number of Cu2+ ions move from tetrahedral spinel sites to octahedral ones: the degree of inversion δ changes from 0 for CuCr2O4 to ≈0.4 for CuAl2O4. In the Cu(Fe2 − xAlx)O4 system, the cubic spinel forms at all x, except x = 0. The degree of inversion δ varies from 1 for CuFe2O4 to ≈0.4 for CuAl2O4 as Al3+ ions substitute Fe3+ ions. The change in the activation energy of the water-gas shift reaction correlates with the inversion of Cu-containing spinels.