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Synthesis and Characterization of Ni/Mg/Al Mixed Oxides Obtained by Co-precipitation

Published online by Cambridge University Press:  31 January 2012

G. Martínez-Lozano ,
T. Kryshtab ,
M. Hesiquio Garduño  and
A. Kryvko
G. Martínez-Lozano
Affiliation:
Department of Physics, ESFM, Instituto Politécnico Nacional, U.P.A.L.M., Av. IPN S/n, Edif. 9, C. P. 07738, Mexico D. F., Mexico.
T. Kryshtab
Affiliation:
Department of Physics, ESFM, Instituto Politécnico Nacional, U.P.A.L.M., Av. IPN S/n, Edif. 9, C. P. 07738, Mexico D. F., Mexico.
M. Hesiquio Garduño
Affiliation:
Department of Petroleum Chemical Engineering, ESIQIE, Instituto Politécnico Nacional, U.P.A.L.M., Av. IPN S/n, Edif. 8, C. P. 07738, Mexico D.F., Mexico.
A. Kryvko
Affiliation:
Department of Systems, ESIME, Instituto Politécnico Nacional, U.P.A.L.M., Av. IPN S/n, Edif. 4, C. P. 07738, Mexico D.F., Mexico. E-mail: [email protected]
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Abstract

Ni/Mg/Al mixed oxides were obtained from hydrotalcite-like precursors by thermal decomposition at 400º, 600º and 800ºC using co-precipitation method at pH 7. The mixed oxides were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Energy-dispersive X-ray spectroscopy (EDS) techniques. XRD analysis revealed the formation of NixMg1-xO (x = 0 - 1), α-Al2O3 and traces of MgAl2O4 (NiAl2O4) phases. The diffraction peak positions for MgO or NiO oxides were shifted towards 2θ values higher than simulated for pure bulk oxides that can be attributed to the possible presence of lattice vacancies or surface compressive stress. The evaluated grain size by XRD technique was about 8 -10 nm. It was also detected the presence of microstrains that can be associated with the presence of extended defects in the grains. SEM observations showed that the particles of oxides are formed as agglomerates with the particle sizes of 50 nm up to 200 nm. EDS detected the presence of Mg2+, Ni2+, and Al3+ cations and oxygen in all particles independently on their size. The obtained results revealed the presence of mixture of Ni/Mg/Al oxides in each particle obtained. The oxides calcined at temperatures of 400º and 600ºC were unstable and under air storage they revert to the precursor. The incorporation of Ni2+ in Mg-Al mixed oxides leads to stability of the compounds calcined at 800ºC.

Keywords

HydrotalciteMixed oxidesCo-precipitationX-ray diffractionMicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1372: Symposium S3 – Structural and Chemical Characterization of Metal Alloys and Compounds—2011 , 2012 , imrc-1372-s3-p57
Copyright
Copyright © Materials Research Society 2012

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References

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