resumo
Furfural, a valuable platform chemical that has the potential to replace a variety of oil/coal/gas derived materials and chemical products, is produced by the dehydration of o-xylose, which in turn is obtained from lignocellulosic biomass. Herein, the conversion of xylose in the presence of nanocrystalline zeolite beta in the H+-form, using water as solvent, was investigated. Detailed batch kinetic studies and products identifications techniques (H-1, C-13 NMR and comprehensive two-dimensional gas chromatography (GC x GC) combined with time-of-flight mass spectrometry (ToFMS)) provided mechanistic insights into the overall reaction process. The conversion of xylose to furfural is accompanied by several side reactions, forming complex reaction mixtures. A pseudo-homogeneous kinetic model was proposed that fitted quite well the experimental data. (C) 2012 Elsevier B.V. All rights reserved.
palavras-chave
SOLID ACID CATALYSTS; D-XYLOSE; VOLATILE COMPONENTS; SUPERCRITICAL WATER; ACTIVE COMPOUNDS; HIGH-TEMPERATURE; SALMO-SALAR; DEHYDRATION; DEGRADATION; H-1-NMR
categoria
Engineering
autores
Ferreira, LR; Lima, S; Neves, P; Antunes, MM; Rocha, SM; Pillinger, M; Portugal, I; Valente, AA
nossos autores
Anabela Tavares Aguiar Valente
Investigador Principal
Inês Portugal
Professor Auxiliar
Maria Margarida Feitor Pintão Moreno Antunes
Investigador Júnior
Martyn Pillinger
Investigador Principal
Patrícia dos Santos Neves
Investigador Auxiliaragradecimentos
We are grateful to Fundacao para a Ciencia e a Tecnologia (FCT), Programa Operacional Ciencia e Inovacao (POCI) 2010, Orcamento do Estado (OE), Fundo Europeu de Desenvolvimento Regional (FEDER) for general funding (Project POCTI/QUI/56112/2004), and to CICECO (Pest-C/CTM/LA0011/2011) and QOPNA (Research Unit 62/94, Project PEst-C/QUI/UI0062/2011). We acknowledge the FCT for a PhD Grant to M.M.A. (SFRH/BD/61648/2009) and postdoctoral Grants to S.L. (SRFH/BPD/23765/2005) and PN (SFRH/BPD/73540/2010). The authors thank Magda Santos for the assistance in the GC x GC-ToFMS analyses.