title: Biomass into chemicals: aerobic oxidation of 5-hydroxymethyl-2-furfural into 2,5-furandicarboxylic acid with gold nanoparticle catalysts.
abstract: 5-hydroxymethyl-2-furfural is selectively converted into 2,5-furandicarboxylic acid (99 mol % yield) in water, under mild conditions (65-130 degrees C, 10 bar air) with gold nanoparticles supported on nanoparticulate ceria (Au-CeO(2)) and on titania (Au-TiO(2)); the former being more active and selective. A reaction mechanism is established and the rate-limiting step of the reaction is the alcohol oxidation of 5-hydroxymethyl-2-furancarboxylic acid into 2,5-furandicarboxylic acid. The effects of pressure, temperature, substrate-to-catalyst ratio, and amount of base are studied to find the most suitable reaction conditions. The absence of metal leaching is verified by chemical analysis of the reaction solution and by confirming that the reaction does not occur after catalyst removal by filtration in hot water. Substrate degradation is strongly diminished and the catalyst life increased by performing the reaction in two temperature steps.
authors.affiliation: Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València, Avda dels Tarongers s/n, 46022 Valencia, Spain.
authors.forename: Onofre
authors.initials: O
authors.lastname: Casanova
authors.forename: Sara
authors.initials: S
authors.lastname: Iborra
authors.forename: Avelino
authors.initials: A
authors.lastname: Corma
mesh_terms: D018533:Biomass; D002264:Carboxylic Acids / Q000138:chemical synthesis; D002384:Catalysis; D005662:Furaldehyde / Q000031:analogs & derivatives* / Q000737:chemistry; D006046:Gold; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D013696:Temperature
chemical_list: D002264:Carboxylic Acids; C008046:5-hydroxymethylfurfural; D006046:Gold; D005662:Furaldehyde