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Journal of Nanomaterials
Volume 2012 (2012), Article ID 428643, 7 pages
http://dx.doi.org/10.1155/2012/428643
Research Article

Urea-Based Combustion Process for the Synthesis of Nanocrystalline Ni-La-Fe-O Catalysts

1Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
2Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt

Received 18 August 2012; Accepted 4 October 2012

Academic Editor: Fathallah Karimzadeh

Copyright © 2012 Bahaa Abu-Zied and Abdullah M. Asiri. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanocrystalline Ni-La-Fe-O catalysts having the general formula NiLaxFe2−xO4 ( ) were synthesized by the combustion route employing urea as a combustion fuel. The calcination process was affected at 500°C. The structural properties of the obtained catalysts were systematically investigated by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), energy-dispersive X-ray spectra (EDX), and nitrogen adsorption at −196°C. Crystalline NiFe2O4 and La2NiO4 phases were detected for the catalysts having and 2.00, respectively, as a result of solid-solid interaction between mixtures precursors. The activity of the obtained catalysts was checked for hydrogen peroxide decomposition at 35–55°C. A synergic effect was observed for the catalysts having -value of 1.00 and 1.50. Such effect was attributed to the increase in the number of the active constituents involved in the catalytic decomposition of H2O2.