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Título: | New heterogeneous catalyst for the esterification of fatty acid produced by surface aromatization/sulfonation of oilseed cake. |
Autor(es): | Santos, Eleonice Moreira Teixeira, Ana Paula de Carvalho Silva, Flávia Gontijo da Cibaka, Thérèse Ebambi Araújo, Maria Helena Oliveira, Willian Xerxes Coelho Medeiros, Felipe Brasil, Alex Nogueira Oliveira, Leandro Soares de Lago, Rochel Montero |
Palavras-chave: | Acid catalyst Oleic acid Esterification Biodiesel cake Aromatization |
Data do documento: | 2015 |
Referência: | SANTOS, E. M. et al. New heterogeneous catalyst for the esterification of fatty acid produced by surface aromatization/sulfonation of oilseed cake. Fuel Guildford, v. 150, p. 408-414, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0016236115001684>. Acesso em: 26 set. 2016. |
Resumo: | In this work, an efficient heterogeneous acid catalyst for the esterification of oleic acid was prepared directly from oilseed cake by a simple sulfonation with concentrated H2SO4. Characterization by SEM/EDS, IR, Raman, TG, TG/MS, potentiometric titration showed that treatment with H2SO4 for 1, 2 and 4 h at 120 _C partially dehydrates the cake to form a carbon/cellulose composite which is sulfonated to produce strong ASO3H acidic sites. These surface sites were active for the esterification of oleic acid with yields ca. 84%, 88% and 94% in the presence of 5, 10 and 20 wt% catalyst, respectively. These results are comparable to 98% yield obtained with 1 wt% H2SO4 and higher than 75% observed for a high surface area (880 m2 g_1) sulfonated activated carbon with similar number of ASO3H active groups. These results are discussed in terms of two effects: (i) the number of sulfonic surface acidic groups and (ii) the presence of a hydrophilic cellulosic fraction in the catalyst that adsorbs/traps water formed in the reaction shifting the esterification equilibrium and improving the yield. |
URI: | http://www.repositorio.ufop.br/handle/123456789/7006 |
DOI: | https://doi.org/10.1016/j.fuel.2015.02.027 |
ISSN: | 0016-2361 |
Licença: | O periódico Fuel concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3957611079029. |
Aparece nas coleções: | DEALI - Artigos publicados em periódicos |
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ARTIGO_New HeterogeneousCatalyst.pdf | 1,42 MB | Adobe PDF | Visualizar/Abrir |
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