Cr/Al oxide as solid acid catalyst to afford babassu biodisel.

Cr/Al oxide as solid acid catalyst to afford babassu biodisel.

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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 m2 g-1), pore size (7.0 ?m), total acidity (182.28 ?mol 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 (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.

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Bibliographic Details
Main Authors: MOURA, C. V. R., NERES, H. L. S., LIMA, M. G., MOURA, E. M., MOITA NETO, J. M., OLIVEIRA, J. E. de, LIMA, J. R. O., STTOLIN, I. M., ARAUJO, E. C. E.
Other Authors: CARLA V. R. MOURA, UFPI; HAROLDO L. S. NERES, UFPI; MARIANE G. LIMA, UFPI; EDMILSON M. MOURA, UFPI; JOSE M. MOITA NETO, UFPI; JOSÉ E. DE OLIVEIRA, UNESP; JOSÉ R. O. LIMA, UFMA; ILZA M. STTOLIN; EUGENIO CELSO EMERITO ARAUJO, CPACP.
Format: Artigo de periódico biblioteca
Language:English
eng
Published: 2015-11-10
Subjects:Óleo de babaçu, Heterogeneidade, Babassu., Babaçu, Catalisador, Lixiviação., biodiesel.,
Online Access:http://www.alice.cnptia.embrapa.br/alice/handle/doc/1028282
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Summary: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 m2 g-1), pore size (7.0 ?m), total acidity (182.28 ?mol 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 (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.

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