Table of Contents
Journal of Catalysts
Volume 2013, Article ID 685063, 10 pages
http://dx.doi.org/10.1155/2013/685063
Research Article

Influence of the Incorporation of Transition Metals on the Basicity of Mg,Al-Mixed Oxides and on Their Catalytic Properties for Transesterification of Vegetable Oils

1UERJ, Instituto de Química, Programa de Pós-graduação em Engenharia Química, Rua São Francisco Xavier, 524, Maracanã, 20550-900 Rio de Janeiro, RJ, Brazil
2INPI, Rua Mayrink Veiga, 9, Centro, 20090-910 Rio de Janeiro, RJ, Brazil
3CENPES/PETROBRAS, PDAB/CB, Avenida Horacio Macedo, 950, Cidade Universitária, 21941-915 Rio de Janeiro, RJ, Brazil

Received 27 December 2012; Revised 11 March 2013; Accepted 14 March 2013

Academic Editor: Mohammed M. Bettahar

Copyright © 2013 Paula M. Veiga et al. 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

The transesterification of vegetable oils produces fatty acid methyl esters (biodiesel). Biodiesel is a nonpolluting alternative fuel produced from renewable resources whose chemical and physical properties closely resemble those of the petroleum diesel fuel and does not contribute to the greenhouse effect. The use of solid catalysts makes biodiesel production processes environmentally friendly. In this work, Mg,Al-mixed oxides derived from Mg,Al-hydrotalcite-like compound with an M3+/() molar ratio of 0.25, in which Mg or Al was partially replaced by Co2+, Cu2+, Cr3+, or Fe3+, were prepared, characterized, and evaluated as catalysts for the transesterification of soybean oil with methanol. The results have indicated that the incorporation of transition metal influenced both textural and base properties. All the evaluated catalysts were active for the studied reaction. The catalytic activity followed the order Cr-MO < Co-MO < Cu-MO < Fe-MO < MO and could be explained by mesoporous volume.