resumo
Titanium dioxide was selectively grown on reduced graphene oxide (TiO2/RGO) and carbon black (TiO2/CB) by a microwave-assisted synthesis in benzyl alcohol to produce nanocomposite catalysts (consisting of 8-9 nm anatase nanoparticles dispersed on the carbon surface) with interesting properties for the production of furfural from renewable carbohydrate biomass. The materials efficiently catalyze the aqueous-phase dehydration of xylose into furfural at 170 degrees C with high furfural yields (67-69%) at high conversions (95-97%). The catalytic performance was not significantly affected by the type of carbon support, suggesting that cheap amorphous carbons can be used to support the titania nanoparticles. Additionally, the catalysts were found to be stable under hydrothermal conditions and outstandingly stable towards coke formation in comparison to other solid acid catalysts reported in the literature. Both composites were reused after a simple wash and drying procedure without any detectable loss of catalytic activity in consecutive batch runs.
palavras-chave
SOLID ACID CATALYSTS; LIQUID-PHASE DEHYDRATION; NONAQUEOUS SYNTHESIS; SELECTIVE PREPARATION; AQUEOUS-SOLUTIONS; GRAPHENE OXIDE; TIN OXIDE; CONVERSION; TIO2; NANOPARTICLES
categoria
Chemistry
autores
Russo, PA; Lima, S; Rebuttini, V; Pillinger, M; Willinger, MG; Pinna, N; Valente, AA
nossos autores
Anabela Tavares Aguiar Valente
Investigador Principal
Martyn Pillinger
Investigador Principal
Nicola Pinna
Investigador
Patrícia Alexandra Ferreira Russo
Bolseiro de pós-Doutoramentoagradecimentos
We are grateful to the Fundacao para a Ciencia e a Tecnologia(FCT), the Programa Operacional Ciencia e Inovacao (POCI) 2010, Orcamento do Estado (OE), Fundo Europeu de Desenvolvimento Regional (FEDER) for general funding (projects POCTI/QUI/56112/2004, PTDC/CTM/098361/2008), and to CICECO (Pest-C/CTM/LA0011/2011). Regina Rothe (Max Planck Institute of Colloids and Interfaces) is acknowledged for the nitrogen adsorption measurements, A.J.S. Fernandes (University of Aveiro) for the Raman measurements and Dr F. Domingues (University of Aveiro) for access to HPLC equipment. We acknowledge the FCT for post-doctoral grants to P.R. (SFRH/BPD/79910/2011) and S.L. (SRFH/BPD/23765/2005).