Structural, magnetic and catalytic properties of cobalt chromite obtained through precursor method

被引：26

作者：

Gingasu, Dana ^{[1
]}

Mindru, Ioana ^{[1
]}

Culita, Daniela C. ^{[1
]}

Patron, Luminita ^{[1
]}

Calderon-Moreno, Jose Maria ^{[1
]}

Osiceanu, Petre ^{[1
]}

Preda, Silviu ^{[1
]}

Oprea, Ovidiu ^{[2
]}

Parvulescu, Viorica ^{[1
]}

Teodorescu, Valentin ^{[3
]}

Walsh, James P. S. ^{[4
,5
]}

机构：

[1] Romanian Acad, Ilie Murgulescu Inst Phys Chem, Bucharest 060021, Romania

[2] Univ Politehn Bucuresti, Fac Chem, Bucharest, Romania

[3] Natl Inst Mat Phys, Bucharest 077125, Romania

[4] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England

[5] Univ Manchester, Photon Sci Inst, Manchester M13 9PL, Lancs, England

来源：

MATERIALS RESEARCH BULLETIN | 2015年 / 62卷

关键词：

Oxides; Chemical synthesis; X-ray diffraction; Transmission electron microscopy; Magnetic properties; POLYNUCLEAR COORDINATION-COMPOUNDS; PHYSICOCHEMICAL CHARACTERIZATION; HYDROTHERMAL SYNTHESIS; COMBUSTION SYNTHESIS; METHANE COMBUSTION; DIESEL SOOT; SPINEL; DECOMPOSITION; TEMPERATURE; REMOVAL;

D O I：

10.1016/j.materresbull.2014.11.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cobalt chromite (CoCr2O4) was synthesized through the precursor method. The precursors: (NH4)(3)[CoCr2(C4O6H4)(4)(OH)(3)]center dot 4H(2)O, (NH4)(3)[CoCr2(C6O7H10)(4)(C6O7H9)]center dot 5H(2)O were characterized by elemental chemical analysis, infrared (IR) and ultraviolet-visible (UV-vis) spectroscopy, and thermal analysis. The final oxides were characterized by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM/TEM), UV-vis, IR, Raman spectroscopy (RS), magnetic measurements, N-2 adsorption-desorption analyses and X-ray photoelectron spectroscopy (XPS). XRD confirmed the cubic CoCr2O4 phase only and determined average crystallite sizes between 14 and 21 nm. Electron microscopy revealed morphology corresponding to the complete crystallization into cubic CoCr2O4. All the samples presented ferrimagnetic ordering below the Currie temperature (T-c), and a phase transition at T-s similar to 26 K attributed to the onset of long-range spiral magnetic order. The CoCr2O4 nanoparticles generated through the gluconate route following calcination at 700 degrees C for 1 h were found to have the best catalytic activity in the total oxidation of methane. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：52 / 64

页数：13

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