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

被引：7

作者：

Plyasova L.M. ^{[1
]}

Minyukova T.P. ^{[1
]}

Yurieva T.M. ^{[1
]}

Bobrikov I.A. ^{[2
]}

Balagurov A.M. ^{[2
]}

机构：

[1] Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk

[2] Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna

来源：

Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques | 2016年 / 10卷 / 6期

关键词：

activation energy; Cu(Cr[!sub]2 − x[!/sub]Al[!sub]x[!/sub])O[!sub]4[!/sub] and Cu(Fe[!sub]2 − x[!/sub]Al[!sub]x[!/sub])O[!sub]4[!/sub] spinels; neutron diffraction; water-gas shift reaction;

D O I：

10.1134/S102745101605058X

中图分类号：

学科分类号：

摘要：

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. © 2016, Pleiades Publishing, Ltd.

引用

页码：1161 / 1168

页数：7

共 17 条

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