Efficient Epimerization of Glucose to Mannose over Molybdenum‐Based Catalyst in Aqueous Media. Issue 5 (5th February 2020)

• Record Type: Journal Article
• Authors: Hu, Hong; Liu, Shaoru; Zhang, Weizi; An, Jiahuan; Xia, Haian
• Is Part Of: ChemistrySelect. Volume 5:Issue 5(2020)
• Page Start: 1728
• Page End: 1733
• Publication Date: 2020-02-05
• Subjects: epimerization -- glucose -- mannose -- molybdenum -- activated carbon -- mechanism; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201903417
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Herein, the high activity and selectivity of activated carbon‐supported molybdenum oxide catalysts (Mo/AC) in the epimerization of glucose to mannose is described. The catalysts afforded near‐equilibrium glucose conversion (29.2 %) and selectivity (94.5 %) toward mannose in the epimerization of glucose. The catalysts were characterized by X‐ray diffraction, UV‐Vis diffuse reflectance spectroscopy, and X‐ray photoelectron spectroscopy. It was found that the Mo/AC catalysts were mainly composed of highly dispersed MoO2 and MoO3 species. Compared to the soluble MoO3 catalyst, Mo/AC showed higher stability and better catalytic performances in the epimerization of glucose to mannose. Further, the deactivation of Mo/AC catalysts was attributed to the leaching of molybdenum oxides. Isotope labeling experiments revealed that the deuterium atom at the C‐1 position of mannose is formed by glucose‐D2 epimerization. Abstract : Activated carbon‐supported molybdenum oxide catalysts (Mo/AC) exhibited the high activity and selectivity of in the epimerization of glucose to mannose. Near‐equilibrium glucose conversion (29.2 %) and selectivity (94.5 %) toward mannose were achieved in the epimerization of glucose. Isotope labeling experiments showed that the deuterium atom at the C‐1 position of mannose was generated by glucose‐D2 epimerization.