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http://hdl.handle.net/1843/56992| Tipo: | Artigo de Periódico |
| Título: | Heterogeneous acid catalyst based on sulfated iron ore tailings for oleic acid esterification |
| Autor(es): | Caroline Duarte Prates Fabiane Carvalho Ballotin Henrique Limborço José Domingos Ardisson Rochel Montero Lago Ana Paula de Carvalho Teixeira |
| Resumen: | In this work, heterogeneous acid catalysts based on sulfated iron oxide produced from mining tailings were prepared by different processes, i.e. ammonium sulfate by simple grinding, (NH4)2SO4 aqueous impregnation and sulfuric acid impregnation, all treated at 500 °C. The materials were characterized by Mössbauer and Raman spectroscopies, FTIR, XRD, SEM, pyridine adsorption FTIR and potentiometric titration. The main mineral phases found were hematite and quartz and it was observed a great increase in the acidity of the materials produced due to the presence of sulfate groups. The synthesis with sulfuric acid was the most efficient process due to the formation of a greater amount of dispersed acid sites (density 0.1211 mmol g−1). The materials were used in esterification reactions. Ester production using 5 wt% of catalyst based on acid synthesis, 1:15 oleic acid:methanol molar ratio, 120 °C and 4 h led to conversions of 100%. |
| Asunto: | Biodiesel Esterificação (Química) Sulfato ferroso Catalise heterogênea |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Institución: | UFMG |
| Departamento: | ICX - DEPARTAMENTO DE QUÍMICA |
| Tipo de acceso: | Acesso Restrito |
| Identificador DOI: | https://doi.org/10.1016/j.apcata.2020.117624 |
| URI: | http://hdl.handle.net/1843/56992 |
| Fecha del documento: | 2020 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0926860X20302179 |
| metadata.dc.relation.ispartof: | Applied Catalysis A: General |
| Aparece en las colecciones: | Artigo de Periódico |
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