Temperature influence on cerium oxide synthesis by microwave hydrothermal method

Reference	Presenter	Authors (Institution)	Abstract
06-015	Lucianna Gama	Oliveira, M.J.(Instituto Federal de Educação, Ciência e Tecnologia do Ceará); Quirino, M.R.(Universidade Federal da Paraíba); Gama, L.(Universidade Federal de Campina Grande);	An efficient methodology in the obtaining of catalysts with properties differentiated with respect to the structural, textural and morphological characteristics is the hydrothermal method assisted by microwave energy. These microwaves couple directly with the material, resulting in a volumetric heating of the same with greater speed. In addition, shorter synthesis temperatures involve energy savings and process cost reduction. The objective of this paper was to synthesize ceria powders at different processing temperatures, i.e., 140 °C, 125°C and 100°C and to verify the influence of this variable on the structural, textural and morphological characteristics of the catalyst, using XRD, SEM and BET analysis. At a low temperature of 100°C it was possible to obtain the monophasic ceria with lowest crystallite size, of 7,5nm. All ceria nanopowders presented relatively spherical shape. The highest superficial area for this material was 116,87m2/g presented by ceria powder synthesized in 125°C due to the crystallization-dissolution-recrystallization process.
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