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A Magnetically Ordered Non-Stoichiometric Zinc Ferrite for the Oxidative Dehydrogenation Reactions.

Published online by Cambridge University Press:  21 March 2011

J. A. Toledo ,
N. Nava ,
X. C. Sun  and
X. Bokhimi
J. A. Toledo
Affiliation:
Prog. Simulación Molecular, Instituto Mexicano del Petróleo, Lázaro Cárdenas # 152, 07730, México, D.F., México.
N. Nava
Affiliation:
Prog. Simulación Molecular, Instituto Mexicano del Petróleo, Lázaro Cárdenas # 152, 07730, México, D.F., México.
X. C. Sun
Affiliation:
Prog. Simulación Molecular, Instituto Mexicano del Petróleo, Lázaro Cárdenas # 152, 07730, México, D.F., México.
X. Bokhimi
Affiliation:
Prog. Simulación Molecular, Instituto Mexicano del Petróleo, Lázaro Cárdenas # 152, 07730, México, D.F., México.
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Abstract

ZnFe2O4 nanoparticles were prepared by hydrothermal reduction approach. A considerable amount of α-Fe2O3 was segregated in the as-synthesized sample, which diffused into the tetrahedral and octahedral sites of the ZnFe2O4 spinel structure with increasing the annealing temperature. The introduction of Fe3+ into the tetrahedral positions was observed by Mössbauer spectra. Magnetization measurements showed an unusual ferrimagnetic behavior of the ZnFe2O4 phase, even at room temperature, confirming the introduction of Fe3+ into the tetrahedral sites of the spinel structure. Catalytic activity measured in the oxidative dehydrogenation of 1-butene reaction increased with increasing annealing temperature, indicating that those interactions of Fe3+ in tetrahedral and octahedral positions also promotes the activity and selectivity to butadiene formation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y3.5
Copyright
Copyright © Materials Research Society 2001

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References

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