Selective aerobic oxidation of 5-HMF into 2,5-furandicarboxylic acid with Pt catalysts supported on TiO2 - and ZrO2 -based supports.
Pt catalysts prepared over different metallic oxide supports were investigated in the oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) in alkaline aqueous solutions with air, to examine the combined effect of the support and base addition. The base (nature and amount) played a significant role in the degradation or oxidation of HMF. Increasing amounts of the weak NaHCO3 base improved significantly the overall catalytic activity of Pt/TiO2 and Pt/ZrO2 by accelerating the oxidation steps, especially for the aldehyde group. This was highlighted by a proposed kinetic model that gave very good concentration-time fittings. Moreover, the promotion of the catalyst with bismuth yielded a PtBi/TiO2 catalytic system with improved activity and stability. Y2 O3  and La2 O3 ZrO2 -supported catalysts exhibited lower activity than Pt/ZrO2 , which suggests no cooperative effect of the weakly basic properties introduced and the homogeneous base. Quantitative oxidation of HMF (0.1 M) and high yields of FDCA (>99 %) were obtained in less than 5 h by using an HMF/Pt molar ratio of 100 and Na2 CO3 as a weak base over PtBi/TiO2 (Bi/Pt=0.22).
IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, UMR5256 CNRS-Université Lyon 1, 2 Avenue Albert Einstein, 69626 Villeurbanne Cedex (France), Fax: (+33) 0472445399.
Hicham
H
Ait Rass
Nadine
N
Essayem
Michèle
M
Besson
D002384:Catalysis; D003998:Dicarboxylic Acids / Q000737:chemistry*; D005662:Furaldehyde / Q000031:analogs & derivatives* / Q000737:chemistry; D005663:Furans / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D017693:Sodium Bicarbonate / Q000737:chemistry; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
D003998:Dicarboxylic Acids; D005663:Furans; C009495:titanium dioxide; D010984:Platinum; C008046:5-hydroxymethylfurfural; C551400:2,5-furandicarboxylic acid; D017693:Sodium Bicarbonate; D015040:Zirconium; D014025:Titanium; D005662:Furaldehyde; C028541:zirconium oxide; D010100:Oxygen
biomass; bismuth; oxidation; platinum; supported catalysts