Data/hora: 19/06/2024 22:12:16

Biblioteca(s): | Embrapa Cocais.
Data corrente: | 10/11/2015
Data da última atualização: | 13/04/2016
Autoria: | 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.
Afiliação: | 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.
Título: | Cr/Al oxide as solid acid catalyst to afford babassu biodisel.
Ano de publicação: | 2015
Fonte/Imprenta: | Journal of the Brazilian Chemical Society, Campinas, p. 1-11, 2015.
Páginas: | 11 p.
Idioma: | Inglês
Conteúdo: | 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.
Palavras-Chave: | Babassu; Heterogeneidade; Óleo de babaçu.
Thesagro: | Babaçu; Catalisador; Lixiviação.
Thesaurus Nal: | biodiesel.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/132888/1/Cr-Al-Oxide-as-Solid-Acid-Catalyst-to-Afford-Babassu-Biodisel.pdf
Registro original: | Embrapa Cocais (CPACP)
Exemplares: | CPACP - (1503-1) - UPC - AP - DD - 633.851 - M929c - 2015.00169 - DIS