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2g -1 ), pore size (7.0 µm), total acidity (182.28 µmol g -1 ), wherein Bronsted 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 (Cr2O3/Na2Cr2O3/Al2O3), 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.

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