Nickel aluminate oxide (NiAl 2 O 4 ) was prepared using chitosan as polymeric precursor and ammonia solution as a precipitating agent. In addition, nickel nitrate and aluminum nitrate salts were used as sources of Ni and Al, under stoichiometric amounts (molar ratio Ni:Al = 1:2). NiAl 2 O 4 particles were prepared at different calcination temperatures and their properties were investigated. The synthesized materials were characterized by X-ray diffraction, infrared spectroscopy, atomic force microscopy, thermogravimetric analysis and nitrogen adsorption-desorption isotherms. The results showed that the thermal treatment process strongly influence on the formation of a single-phase structure of NiAl 2 O 4 spinel. Nickel aluminate spinel with a porous structure and high surface area was obtained at temperatures above 700 o C. Keywords: nickel aluminate, synthesis, characterization, chitosan, porous material.
Resumo
Aluminato de níquel (NiAl
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