Electroreforming of Glucose/Xylose Mixtures On PdAu Based Nanocatalysts. Issue 2 (25th January 2022)

• Record Type: Journal Article
• Authors: Rafaïdeen, Thibault; Baranton, Stève; Coutanceau, Christophe
• Is Part Of: ChemElectroChem. Volume 9:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-25
• Subjects: chronoamperometry -- electrooxidation -- Electroreforming -- Glucose -- in situ FTIRS -- Xylose; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202101575
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: The electroreforming of glucose/xylose mixtures has been evaluated at Pd1‐ x Au x /C anodes in 0.10 mol L −1 NaOH electrolyte. The catalysts synthesized by a wet chemistry route are comprehensively characterized by physicochemical and electrochemical techniques. From linear scan voltammetry and in situ Fourier transform infrared spectroscopy measurements, it was shown that the Pd0.3 Au0.7 /C material led to the best electrocatalytic behavior towards the electrooxidation of glucose/xylose mixtures in terms of activity (higher current densities at lower potentials) and selectivity (lower dissociative adsorption). Six‐hour chronoamperometry measurements were performed at 293 K in a 25 cm 2 electrolysis cell at +0.4 V and +0.6 V and the reaction products were analyzed by high performance liquid chromatography. The main products were gluconate and xylonate, but the contributions of xylose to all formed products was always lower in percentages than the initial xylose ratios in solutions, showing that glucose was more electro‐reactive than xylose at Pd0.3 Au0.7 surface. Abstract : Sugar off : After separation of lignin from lignocellulosic biomass, glucose and xylose are the main sugars remaining in hydrolysates. The selective electroreforming of glucose/xylose mixtures into their corresponding carboxylates is studied for the first time. Results from linear scan voltammetry, in situ infrared spectroscopy and chronoamperometry measurements give new insights on the reactivity of both sugars at a Pd3 Au7 catalytic surface.