Conversion of furfuryl alcohol to ethyl levulinate using porous aluminosilicate acid catalysts

abstract

The following porous aluminosilicates were tested as acid catalysts in the reaction of furfuryl alcohol (FA) with ethanol, at 140 C: micro/mesoporous composite Beta/TUD-1 and the correspondent nanocrystalline (large pore) zeolite H-Beta; ITQ-2 and its zeolite counterpart (medium pore) H-MCM-22; mesoporous Al-TUD-1. The target product ethyl levulinate (EL) was formed with a yield up to 80%, at 24 h reaction (100% FA conversion). Relationships between the catalytic results and the acid and texture properties of the catalysts were established. Comparative studies for the aluminosilicates and the well-known sulfonic acid resin AmberlystTm-15 were reported on the basis of EL yields, the undesirable formation of diethyl ether, and catalyst stability (regeneration and reuse). A study of the reaction products was carried out by comprehensive two-dimensional gas chromatography combined with time-of-flight mass spectrometry. (C) 2013 Elsevier B.V. All rights reserved.

keywords

TRANSPORTATION FUELS; VOLATILE COMPOUNDS; BIOMASS; ETHANOL; AROMA; XYLOSE; 1,1-DIETHOXYETHANE; ETHERIFICATION; IDENTIFICATION; DIMETHYLFURAN

subject category

Chemistry; Engineering

authors

Neves, P; Lima, S; Pillinger, M; Rocha, SM; Rocha, J; Valente, AA

our authors

acknowledgements

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 post-doctoral grants to P.N. (SFRH/BPD/73540/2010) and S.L. (SRFH/BPD/23765/2005). The authors thank Magda Santos and Celeste Azevedo for the assistance in the GC x GC-ToFMS and thermal analyses, respectively, and Professor Maria Filipa Ribeiro and Doctor Auguste Fernandes (Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Tecnico) for their previous collaboration in the measurements of the acid properties of the aluminosilicates.

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