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Oxidation of glyoxal to glyoxylic acid by oxygen over V_2O_5/C catalyst

Chinese Chemical Letters 2008年第2期19卷 245-248页

作者： Yu Lan Niu Zheng Xu Min Li Rui Feng Li Key Laboratory of Coal Science and Technology MOE Institute of Special Chemicals Taiyuan University of TechnologyTaiyuan 030024 PR China Department of Chemical Engineering Taiyuan Institute of Technology Taiyuan 030008 PR China

A novel vanadium oxide catalyst supported on active carbon was prepared by an incipient wetness impregnation method, and the precursor was obtained from oxalic acid aqueous solutions of NH4VO3. The catalyst was applied liquid phase oxidation of glyoxal to glyoxylic acid. It was found that V2O5/C catalyst exhibited obvious activity for glyoxal oxidation. glyoxylic acid could be obtained without pH regulation during the reaction. By using this catalyst, the conversion of glyoxal and the yield of glyoxalic acid were 29.2% and 13.6%, respectively at 313 K and oxygen flow 0.1 L/rain after reaction for 10 h.

关键词： Glyoxal glyoxylic acid Vanadium catalyst Oxidation

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Electrocatalytic production of glycolic acid via oxalic acid reduction on titania debris supported on a TiO_(2)nanotube array

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Journal of Energy Chemistry 2022年第5期31卷 669-678页

作者： Francesco Pio Abramo Federica De Luca Rosalba Passalacqua Gabriele Centi Gianfranco Giorgianni Siglinda Perathoner Salvatore Abate Department of ChiBioFarAM(Industrial Chemistry) University of MessinaERIC aisbl and INSTM/CASPEV.le F.Stagno d’Alcontres 31Messina 98166Italy University of Calabria Department of Environmental EngineeringLaboratory of Industrial Chemistry and Catalysis Via P.Bucci87036 RendeCSItaly

Electrodes prepared by anodic oxidation of Ti foils are robust and not toxic materials for the electrocatalytic reduction of oxalic acid to glycolic acid, allowing the development of a renewable energy-driven process for producing an alcoholic compound from an organic acid at low potential and room temperature. Coupled with the electrochemical synthesis of the oxalic acid from CO_(2),this process represents a new green and low-carbon path to produce added value chemicals from CO_(2). Various electrodes prepared by anodic oxidation of Ti foils were investigated. They were characterized by the presence of a TiO_(2) nanotube array together with the presence of small patches, debris, or TiO_(2) nanoparticles. The concentration of oxygen vacancies, the amount of Ti^(3+) measured by X-ray photoelectron spectroscopy(XPS) and the intensity of the anodic peak measured by cyclic voltammetry, were positively correlated with the achieved oxalic acid conversion and glycolic acid yield. The analysis of the results indicates the presence of small amorphous TiO_(2) nanoparticles(or surface patches or debris) interacting with TiO_(2) nanotubes, the sites responsible for the conversion of oxalic acid and glycolic acid yield. By varying this structural characteristic of the electrodes, it is possible to tune the glycolic acid to glyoxylic acid relative ratio. A best cumulative Faradaic efficiency(FE) of about 84% with FE to glycolic acid around 60% and oxalic conversion about 30% was observed.

关键词： Oxalic acid TiO_(2)nanotubes glyoxylic acid Glycolic acid Electrocatalysis

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