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Cr/Al Oxide as Solid Acid Catalyst to Afford Babassu Biodisel

2015; Brazilian Chemical Society; Linguagem: Inglês

10.5935/0103-5053.20150279

1678-4790

Carla Verônica Rodarte de Moura, Haroldo Luis Sousa Neres, Mariane G. Lima, Edmílson Miranda de Moura, José Machado Moita Neto, José Eduardo de Oliveira, José Renato de Oliveira Lima, Ilza M. Sttolin, E. C. E. Araújo,

Biodiesel Production and Applications

In this work, it was described the preparation and the characterization of a solid acid catalyst obtained by the mixture of Cr/Al oxides (CRAL).The catalyst was tested in the transesterification reaction of babassu oil with 5% of free fatty acid (FFA).The results of textural and acidity characteristics of CRAL were: area (56 m 2 g -1 ), pore size (7.0 µm), total acidity (182.28 µmol g -1 ), wherein Brönsted sites are the most active.Powder X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) show three phases of the catalyst (Cr 2 O 3 /Na 2 Cr 2 O 3 /Al 2 O 3 ), 0.25:0.25:0.50,respectively.The reaction reached conversion about 98.6% under the conditions: alcohol/oil molar ratio (24:1), catalyst to oil mass ratio of 3.0%, 15 h and 70 ºC.The turnover frequency (TOF) found was 24.5 × 10 -4 s -1 .Kinetic of the reaction was researched over a temperature range of 60-80 ºC.A pseudo first-order model was proposed with the activation energy (Ea) of 49.18 kJ mol -1 .CRAL is active in the biodiesel production for just one cycle, because in the second one it loses its activity.The leaching of catalyst is about 13%, demonstrating that the catalyst is not totally heterogeneous.