Selective photocatalytic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxaldehyde by polymeric carbon nitride-hydrogen peroxide adduct
authors Ilkaeva, M; Krivtsov, I; Garcia-Lopez, EI; Marci, G; Khainakova, O; Garcia, JR; Palmisano, L; Diaz, E; Ordonez, S
nationality International
journal JOURNAL OF CATALYSIS
author keywords Photocatalysis; Carbon nitride; Selective photo-oxidation; 5-Hydroxymethylfurfural; 2,5-Furandicarboxaldehyde
keywords METAL-FREE OXIDATION; VISIBLE-LIGHT; AEROBIC OXIDATION; ORGANIC TRANSFORMATIONS; WATER; TIO2; CATALYSTS; BIOMASS; 2,5-DIFORMYLFURAN; PERFORMANCE
abstract Polymeric carbon nitride-hydrogen peroxide adduct (PCN-H2O2) has been prepared, thoroughly characterised and its application for selective photocatalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxaldehyde (FDC) in aqueous suspension has been studied. The PCN-H2O2 adduct is stable in aqueous suspension under UV and solar irradiation up to 100 degrees C. It is also stable up to 200 degrees C if heated in air, while at temperatures close to 300 degrees C its decomposition takes place. Based on the obtained characterisation data it has been proposed that H2O2 attaches to the non-polymerised carbon nitride species and to the heptazine nitrogen atoms, thus producing strong hydrogen bonding within the PCN-H2O2 adduct. The blockage of the surface amino-groups in PCN-H2O2 by H2O2 hinders the interaction of HMF with these sites, which are responsible for unselective substrate conversion. PCN-H2O2, although being less active, possesses a superior selectivity in natural solar light assisted oxidation of HMF to FDC reaching 80% with respect to its thermally etched PCN counterpart, which gives rise to a 40-50% selectivity. We believe that the exceptional performance of the applied photocatalyst in the selective photocatalytic conversion of HMF to a high added value FDC in a green solvent under natural illumination makes a significant contribution to the development of environmentally friendly technologies for biomass valorisation. (C) 2018 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0021-9517
year published 2018
volume 359
beginning page 212
ending page 222
digital object identifier (doi) 10.1016/j.jcat.2018.01.012
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000426233700022
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journal impact factor 6.759
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