[1] Univ Fed Paraiba, CCEN, Dept Quim, Lab Combustiveis & Mat, BR-58059900 Joao Pessoa, Paraiba, Brazil
[2] Univ Fed Piaui, CCN, Dept Quim, Lab Biodiesel & Mat, BR-64049550 Teresina, PI, Brazil
[3] Univ Fed Maranhao, BR-65200000 Pinheiro, MA, Brazil
[4] Univ Fed Pernambuco, Dept Engn Quim, Recife, PE, Brazil
[5] IFAM, Inst Fed Educ Ciencia & Tecnol Amazonas, BR-69083000 Manaus, Amazonas, Brazil