Electroreforming of Glucose and Xylose in Alkaline Medium at Carbon Supported Alloyed Pd3Au7 Nanocatalysts: Effect of Aldose Concentration and Electrolysis Cell Voltage

Thibault Rafaïdeen, Neha Neha, Bitty Roméo Serge Kouamé, Stève Baranton and Christophe Coutanceau
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Thibault Rafaïdeen: IC2MP, UMR CNRS—Université de Poitiers n° 7285, 4 rue Michel Brunet, TSA 51106, CEDEX 9, 86073 Poitiers, France
Neha Neha: IC2MP, UMR CNRS—Université de Poitiers n° 7285, 4 rue Michel Brunet, TSA 51106, CEDEX 9, 86073 Poitiers, France
Bitty Roméo Serge Kouamé: IC2MP, UMR CNRS—Université de Poitiers n° 7285, 4 rue Michel Brunet, TSA 51106, CEDEX 9, 86073 Poitiers, France
Stève Baranton: IC2MP, UMR CNRS—Université de Poitiers n° 7285, 4 rue Michel Brunet, TSA 51106, CEDEX 9, 86073 Poitiers, France
Christophe Coutanceau: IC2MP, UMR CNRS—Université de Poitiers n° 7285, 4 rue Michel Brunet, TSA 51106, CEDEX 9, 86073 Poitiers, France

Clean Technol., 2020, vol. 2, issue 2, 1-20

Abstract: The effects of cell voltage and of concentration of sugars (glucose and xylose) on the performances of their electro-reforming have been evaluated at a Pd 3 Au 7 /C anode in 0.10 mol L −1 NaOH solution. The catalyst synthesized by a wet chemistry route is first comprehensively characterized by physicochemical and electrochemical techniques. The supported catalyst consists in alloyed Pd 3 Au 7 nanoparticles of circa 6 nm mean diameter deposited on a Vulcan XC72 carbon support, with a metal loading close to 40 wt%. Six-hour chronoamperometry measurements are performed at 293 K in a 25 cm 2 electrolysis cell for the electro-conversion of 0.10 mol L −1 and 0.50 mol L −1 glucose and xylose at cell voltages of +0.4 V, +0.6 V and +0.8 V. Reaction products are analyzed every hour by high performance liquid chromatography. The main products are gluconate and xylonate for glucose and xylose electro-reforming, respectively, but the faradaic yield, the selectivity and the formation rate of gluconate/xylonate decrease with the increase of aldose concentration, whereas lower faradaic yields and higher formation rates of gluconate/xylonate are observed at +0.8 V than at +0.4 V (higher chemical yields).

Keywords: electrolysis; glucose; gluconic acid; gold; oxidation; palladium; xylose; xylonic acid (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2020
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