Low‐energy Hemiacetal Dehydrogenation Pathway: Co‐production of Gluconic Acid and Green Hydrogen via Glucose Dehydrogenation

Abstract

Exploring low‐energy reaction pathway of catalytic biomass conversion can lead to wider application and the achievement of sustainability objectives. Since glucose dehydrogenation to gluconic acid and H2 is a cost‐effective alternative to glucose oxidation, this study aims to elucidate its mechanism. The detection of lactone as an intermediate indicates that cyclic glucose reacts directly via its hemiacetal group–ring opening is not involved; that is, cyclic glucose is dehydrogenated to lactone, which is further hydrolyzed to gluconic acid. The source of hydrogen is confirmed to be from glucose and water by Isotope tracing analysis. Density function theory calculations demonstrate that Hemiacetal Dehydrogenation Pathway (this work) is less energy intensive than Ring‐opening Oxidation Pathway (previous works). This study provides a new dehydrogenation strategy to produce gluconic acid and H2 from biomass under mild conditions.

ZIF-8-Derived Three-Dimensional Nitrogen-Doped Porous Carbon as a Pt Catalyst Support for Electrocatalytic Oxidation of Glucose in a Glucose Fuel Cell

“…During the glucose oxidation reaction (GOR), glucose is predominantly oxidized to gluconolactone, releasing two electrons and two protons. Then, gluconolactone undergoes hydrolysis to form gluconic acid. ,− The main challenge in the development of GFCs arises from the slow glucose oxidation kinetics and its low diffusion coefficient. , Therefore, the catalyst is proposed to accelerate the reaction rate. Anode : .25em normalC 6 normalH 12 normalO 6 + normalH 2 normalO → normalC 6 normalH 12 normalO 7 + 2 normalH + + 2 normale − Cathode : .25em 0.5 normalO 2 + 2 normalH + + 2 normale − → normalH 2 normalO Overall : .25em normalC 6 normalH 12 normalO 6 + 0.5 normalO 2 → normalC 6 normalH 12 normalO 7 …”

“…During the glucose oxidation reaction (GOR), glucose is predominantly oxidized to gluconolactone, releasing two electrons and two protons. Then, gluconolactone undergoes hydrolysis to form gluconic acid. ,− The main challenge in the development of GFCs arises from the slow glucose oxidation kinetics and its low diffusion coefficient. , Therefore, the catalyst is proposed to accelerate the reaction rate. …”

Processing of Grape Bagasse and Potato Wastes for the Co-Production of Bacterial Cellulose and Gluconic Acid in an Airlift Bioreactor

“…In fact, this is more interesting when the co-production is by using food waste as a substrate source to reduce the production cost [25,26]. Several examples of co-production of gluconic acid and different compounds can be found in the literature, such as the simultaneous production of BC and pear vinegar by fermentation of pear peel and pomace [27], 5-hydroxymethyl furfural and gluconic acid [25], single cell oil and gluconic acid [26], gluconic acid and green hydrogen [28] or gluconic acid and xylonic acid [29].…”

Synthesis of Carbon Black Loaded Pt Concave Nanocubes with High-Index Facets and their Enhanced Electrocatalytic Properties toward Glucose Oxidation

“…Generally, loading Pt-based NCs on the carbon supports (graphene, carbon nanotubes, carbon black, etc.) is an effective strategy for enhancing catalytic stability [23][24][25][26][27]. Zhou et al investigated the catalytic properties of high-index faceted Pt NCs supported on carbon black (HIF-Pt/C) for ethanol electrooxidation.…”