title: One-pot aldol condensation and hydrodeoxygenation of biomass-derived carbonyl compounds for biodiesel synthesis.
abstract: Integrating reaction steps is of key interest in the development of processes for transforming lignocellulosic materials into drop-in fuels. We propose a procedure for performing the aldol condensation (reaction between furfural and acetone is taken as model reaction) and the total hydrodeoxygenation of the resulting condensation adducts in one step, yielding n-alkanes. Different combinations of catalysts (bifunctional catalysts or mechanical mixtures), reaction conditions, and solvents (aqueous and organic) have been tested for performing these reactions in an isothermal batch reactor. The results suggest that the use of bifunctional catalysts and aqueous phase lead to an effective integration of both reactions. Therefore, selectivities to n-alkanes higher than 50% were obtained using this catalyst at typical hydrogenation conditions (T=493 K, P=4.5 MPa, 24 h reaction time). The use of organic solvent, carbonaceous supports, or mechanical mixtures of monofunctional catalysts leads to poorer results owing to side effects; mainly, hydrogenation of reactants and adsorption processes.
authors.affiliation: Department of Chemical and Environmental Engineering, University of Oviedo, C/Julián Clavería, s/n-33006-Oviedo-Asturias (Spain), Fax: (+34) 985103434.
authors.forename: Laura
authors.initials: L
authors.lastname: Faba
authors.forename: Eva
authors.initials: E
authors.lastname: Díaz
authors.forename: Salvador
authors.initials: S
authors.lastname: Ordóñez
mesh_terms: D000096:Acetone / Q000737:chemistry; D000473:Alkanes / Q000138:chemical synthesis* / Q000737:chemistry; D056804:Biofuels; D018533:Biomass; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D005662:Furaldehyde / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D014961:X-Ray Diffraction
chemical_list: D000473:Alkanes; D056804:Biofuels; D000096:Acetone; D002482:Cellulose; D005662:Furaldehyde
keywords: CC coupling; aldol reaction; biofuels; heterogeneous catalysis; hydrodeoxygenation