Direct conversion of glucose to 5-hydroxymethylfurfural using a mixture of niobic acid and niobium phosphate as a solid acid catalyst

• Autor(a) principal: Catrinck, Mariana N.
• Data de Publicação: 2017
• Outros Autores: Ribeiro, Emerson S., Monteiro, Robson S., Ribas, Rogério M., Barbosa, Márcio H.P., Teófilo, Reinaldo F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: https://doi.org/10.1016/j.fuel.2017.08.035; http://www.locus.ufv.br/handle/123456789/21608
• topic: Lignocellulosic biomass; Heterogeneous catalysis; Sugarcane; Optimization process; CCD design

The aim of this work was to optimize the acid-catalyzed conversion of glucose into 5-hydroxymethylfurfural (HMF) in an aqueous medium using niobic acid (NbO), niobium phosphate (NbP) and a mixture of both solid acid catalysts. A simplex-centroid mixture design was applied to optimize the mixture ratio between NbO and NbP. A central composite design was applied to process optimization. The studied variables were temperature (T), time (t) and substrate to catalyst weight ratio (RS/C). The mixture design revealed excellent glucose conversion (55%) and HMF selectivity (56%) when the weight ratio between NbO and NbP was equal to 1:1. The experimental results demonstrate that a mixture of both solid acids provides a better combination of Brønsted and Lewis acidity for effective glucose dehydration into HMF than each individual catalyst.