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Evaluation of the catalytic activity of oxide nanoparticles synthesized by the polymeric precursor method on biodiesel production

Published online by Cambridge University Press:  13 November 2012

Gabriela Santilli do Nascimento
Affiliation:
Departamento de Química, Universidade Federal de São Carlos, CEP 13.565-905, São Carlos, São Paulo, Brazil
Giovanni Pimenta Mambrini
Affiliation:
Departamento de Química, Universidade Federal de Viçosa, s/n - Campus Universitário, CEP 36570-000, Viçosa, Minas Gerais, Brazil
Elaine Cristina Paris
Affiliation:
Embrapa Instrumentação, CEP 13560-970, São Carlos, São Paulo, Brazil
Juliano Aurelio Peres
Affiliation:
Departamento de Química, Universidade Federal de São Carlos, CEP 13.565-905, São Carlos, São Paulo, Brazil
Luis Alberto Colnago
Affiliation:
Embrapa Instrumentação, CEP 13560-970, São Carlos, São Paulo, Brazil
Caue Ribeiro*
Affiliation:
Embrapa Instrumentação, CEP 13560-970, São Carlos, São Paulo, Brazil
*
a)Address all correspondence to this author. e-mail: caue@cnpdia.embrapa.br
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Abstract

This paper shows a comparison between different nanostructured oxides, obtained by polymeric precursor method, regarding their activity for biodiesel conversion from oil–methanol mixtures. The basicity/acidity and surface area (SA) of the oxides were taken in account to analyze the catalytic activity in the transesterification reaction. The temperature dependence for the heterogeneous catalysts was analyzed, where only CaO showed activities at 70 °C (∼98% of conversion), while the other oxides, SnO2, ZnO, TiO2, CaTiO3, were observed active only at 150 °C for the reaction parameters adopted. The results revealed that the highest activity observed is not associated to SA only but mainly with the surface basicity. This suggest that, for oxides synthesized by the polymeric precursor method, the surface basicity surpasses the particle size effects in catalysis in a way to promote the transesterification reaction.

Type
Articles
Copyright
Copyright © Materials Research Society 2012

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References

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