Preparation and Physical Chemistry Characterization of New Nanostructured Oxides Catalysts by Spray Pyrolysis Method for the Biodiesel Production

Silvania Lanfredi; Elisabeth Djurado; Marcos A.L. Nobre

doi:10.4028/www.scientific.net/MSF.912.7

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HomeMaterials Science ForumMaterials Science Forum Vol. 912Preparation and Physical Chemistry...

Preparation and Physical Chemistry Characterization of New Nanostructured Oxides Catalysts by Spray Pyrolysis Method for the Biodiesel Production

Abstract:

In this work were synthesized new catalysts of stoichiometries Sr_0.8K_0.2TiCu_0.10O₃, Sr_0.7K_0.3TiCu_0.15O₃ and Sr_0.5K_0.5TiCu_0.25O₃ by spray pyrolysis method. The synthesis conditions were optimized to obtain single phase powder of titanates of double perovskite structure, with an ultrasound vibration frequency of 1.3 MHz at 700 °C under air flow. The average crystallite size of the powders, determined by the Scherrer equation and using the Jade Plus 8 software, was at around 9 nm. The powder morphology was analyzed by scanning electron microscopy (SEM). The Sr_0.5K_0.5TiCu_0.25O₃system showed particles with smooth surfaces, spherical and with smaller agglomerates than Sr_0.8K_0.2TiCu_0.10O₃, Sr_0.7K_0.3TiCu_0.15O₃ systems. This phenomenon suggests that the stoichiometry changes the aspect of the particle surface, which may influence in the catalytic activity. Thus, particles without roughening and smaller size can act as promising catalysts.

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Periodical:

Materials Science Forum (Volume 912)

Pages:

7-11

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.912.7

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Online since:

January 2018

Authors:

Silvania Lanfredi, Elisabeth Djurado, Marcos A.L. Nobre

Keywords:

Double Perovskite, Spray Pyrolysis Method, Titanates, X-Ray Diffraction

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