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Electrocatalytic Oxidation of 5‐Hydroxymethylfurfural into the Monomer 2,5‐Furandicarboxylic Acid using Mesostructured Nickel Oxide
Author(s) -
Holzhäuser Fabian Joschka,
Janke Tobias,
Öztas Fatma,
Broicher Cornelia,
Palkovits Regina
Publication year - 2020
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.201900151
Subject(s) - non blocking i/o , nickel oxide , catalysis , nickel , materials science , chemical engineering , oxide , aqueous solution , inorganic chemistry , selectivity , dispersion (optics) , chemistry , metallurgy , organic chemistry , physics , optics , engineering
Transforming biomass based compounds with renewable electrical energy into products presents a promising approach towards development of a circular economy. Herein, 5‐hydroxymethylfurfural (HMF), derivable from cellulose and hemicellulose, is successfully electrochemically converted into 2,5‐furandicarboxylic acid (FDCA). The reactions are performed in alkaline aqueous solutions using commercial nickel oxide (NiO) or a mesostructured nickel oxide derived by CMK‐1 templating (NiO‐CMK‐1). Both catalytic activity and the selectivity of FDCA are highly dependent on the catalyst structure. NiO‐CMK‐1 facilitates multiple times higher FDCA selectivity (>80%) compared with commercial NiO (30%). Electrochemical analyses emphasize a net‐current density for NiO of 2 mA cm −2 whereas for NiO‐CMK‐1 the net‐current density increases significantly to above 4 mA cm −2 . The exposed material surface and structure of the catalysts are analyzed via nitrogen physisorption and powder X‐ray diffraction revealing that both NiO and NiO‐CMK‐1 possess a face‐centered cubic crystal structure but distinctly different exposed surface areas. Since NiO‐CMK‐1 enables remarkably improved catalytic activity for the oxidation of HMF, a recycling study is conducted with five consecutive catalytic cycles emphasizing the technological potential of this approach.