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  • 1 Centro de Educação e Saúde, Universidade Federal de Campina Grande, Campus de Cuité. Olho D′Água da Bica S/N, Cuité, PB, Brazil
  • 2 Centro de Formação de Professores, Escola Técnica de Cajazeiras, UFCG, Cajazeiras, PB, Brazil
  • 3 Universidade Federal do Maranhão, Campus Imperatriz, Imperatriz, MA, Brazil
  • 4 Universidade Federal do Rio Grande do Norte, LCL, Natal, RN, Brazil
  • 5 Universidade Federal da Paraíba, LACOM, Campus I, João Pessoa, PB, Brazil
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Abstract

The diversity of raw materials and technological routes employed in the biodiesel production has resulted in products with different chemical properties. This non-uniformity in the biodiesel composition may influence to the fuel quality. The aim of this study was to evaluate biodiesel blends of passion fruit and castor oil in different proportions and their thermal stability. Biodiesel blends of passion fruit and castor oil presented parameters in the standards of the Petroleum, Natural Gas and Biofuels National Agency. The TG curves indicated that castor oil biodiesel was more stable. Passion fruit biodiesel has a high content of oleic and linoleic acids, which are more susceptible to oxidation. Biodiesel blend of passion fruit and castor oil 1:1 increased the thermal stability in relation to passion fruit biodiesel. Biodiesel blend of passion fruit and castor oil 1:2 presented higher thermal stability, because castor oil has a high content of ricinoleic acid.

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