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Registro Completo |
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Biblioteca(s): |
Embrapa Roraima. |
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Data corrente: |
09/04/2003 |
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Data da última atualização: |
17/11/2022 |
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Autoria: |
OLIVEIRA JUNIOR, J. O. L. de; MEDEIROS, R. D. de; MOREIRA, M. A. B. |
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Título: |
A cultura do feijão caupi (Vigna unguiculata (L.) Walp) no estado de Roraima. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Boa Vista: Embrapa Roraima, 1999 |
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Páginas: |
2 p. |
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Série: |
(Embrapa Roraima. Embrapa Informa, ano VI, n.1) |
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Idioma: |
Português |
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Palavras-Chave: |
Brasil; Calpi; Cultivo; Roraima. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/690143/1/CULT-FEIJAO-CAUPI-VIGNA...NO-ESTADO-DE-RR-AGO2000.pdf
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Marc: |
LEADER 00558nam a2200193 a 4500
001 1690143
005 2022-11-17
008 1999 bl uuuu u0uu1 u #d
100 1 $aOLIVEIRA JUNIOR, J. O. L. de
245 $aA cultura do feijão caupi (Vigna unguiculata (L.) Walp) no estado de Roraima.
260 $aBoa Vista: Embrapa Roraima$c1999
300 $a2 p.
490 $a(Embrapa Roraima. Embrapa Informa, ano VI, n.1)
653 $aBrasil
653 $aCalpi
653 $aCultivo
653 $aRoraima
700 1 $aMEDEIROS, R. D. de
700 1 $aMOREIRA, M. A. B.
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Registro original: |
Embrapa Roraima (CPAF-RR) |
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Registro Completo
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Biblioteca(s): |
Embrapa Cocais. |
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Data corrente: |
10/11/2015 |
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Data da última atualização: |
13/04/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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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. |
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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. |
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Título: |
Cr/Al oxide as solid acid catalyst to afford babassu biodisel. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Journal of the Brazilian Chemical Society, Campinas, p. 1-11, 2015. |
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Páginas: |
11 p. |
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Idioma: |
Inglês |
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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. |
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Palavras-Chave: |
Babassu; Heterogeneidade; Óleo de babaçu. |
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Thesagro: |
Babaçu; Catalisador; Lixiviação. |
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Thesaurus NAL: |
biodiesel. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/132888/1/Cr-Al-Oxide-as-Solid-Acid-Catalyst-to-Afford-Babassu-Biodisel.pdf
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Marc: |
LEADER 02079naa a2200313 a 4500
001 2028282
005 2016-04-13
008 2015 bl uuuu u00u1 u #d
100 1 $aMOURA, C. V. R.
245 $aCr/Al oxide as solid acid catalyst to afford babassu biodisel.$h[electronic resource]
260 $c2015
300 $a11 p.
520 $aIn 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.
650 $abiodiesel
650 $aBabaçu
650 $aCatalisador
650 $aLixiviação
653 $aBabassu
653 $aHeterogeneidade
653 $aÓleo de babaçu
700 1 $aNERES, H. L. S.
700 1 $aLIMA, M. G.
700 1 $aMOURA, E. M.
700 1 $aMOITA NETO, J. M.
700 1 $aOLIVEIRA, J. E. de
700 1 $aLIMA, J. R. O.
700 1 $aSTTOLIN, I. M.
700 1 $aARAUJO, E. C. E.
773 $tJournal of the Brazilian Chemical Society, Campinas, p. 1-11, 2015.
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Registro original: |
Embrapa Cocais (CPACP) |
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