Influence of the Method of Preparation of the Pd-Bi/Al2O3 Catalyst on Catalytic Properties in the Reaction of Liquid-Phase Oxidation of Glucose into Gluconic Acid

Mariya P Sandu,Aleksandr V Chernyavskii,Irina A Kurzina,Andrej A Geraskin,Vladimir S Sidelnikov

doi:10.3390/catal10030271

Abstract

Gluconic acid and its derivatives are extensively used in pharmaceutical, food, textile, and pulp and paper branches of industry during production of food additives, cleansers, medicinal drugs, stabilizers, etc. To obtain gluconic acid, the method of conversion of glucose into gluconic acid by molecular oxygen in the presence of solid catalysts is promising. The process of obtaining Pd and bimetallic nanoparticles Pd-Bi, coated on Al2O3, has been considered in the work. Samples were prepared by combined and successive impregnation of the Al2O3 support using metalloorganic precursors Pd(acac)2, Bi(ac)3, and dissolved in an organic solvent (acetic acid), followed by the removal of excess solvent. To achieve the formation of Pd and bimetallic nanoparticles Pd-Bi on the substrate surface, the synthesized samples were subjected to thermal decomposition sequentially in the atmosphere of Ar, O2, and H2. The surface of the obtained catalysts was studied by a combination of physicochemical methods of analysis. The catalysts were analyzed in the reaction of liquid phase oxidation of glucose. The best results are achieved in the presence of the catalyst obtained by combined impregnation.

Highlights

Obtainment of gluconic acid and its derivatives is an important process of fine organic synthesis since these products are extensively used in different fields of industry [1,2]
We assumed that the interaction of the bismuth acetate solution with the Al2 O3 surface would proceed accompanied by the formation of surface-adsorbed aluminum acetate
We found that a good resolution between peaks of glucose and gluconic acid cannot be achieved in ion-exchange mode [50]

Summary

Introduction

Obtainment of gluconic acid and its derivatives is an important process of fine organic synthesis since these products are extensively used in different fields of industry [1,2]. Gluconic acid and its salts are applied as a preservative, a buffer component to maintain the acidity of the medium of different cosmetic products, and in tableted dosage forms [3]. Due to its healing properties, is used as a component for treatment of wounds, colds, and infections [4]. Gluconic acid has an antioxidant action due to the presence of carboxyl and hydroxyl groups in the structure. Gluconic acid is used in the form of a food additive as a conservative agent, leavening agent, and acidity regulator [5]

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