The objective of this study is to develop the efficient catalyst for producing 5-hydroxymethylfurfural(HMF), the high value-added chemical used as the material for plastics or medical supplies, from saccharides thermo-chemically. Considering the conversion pathways of saccharides into HMF, the catalyst needs to possess the properties of both Br�nsted acid and Lewis acid in a well-balanced amount. Consequently, we prepared the ion exchange resin impregnated for 24 h with metal nitrate solutions. Amberlyst, one of the strong Br�nsted acid ion exchange resins with sulfo groups, was chosen as the catalyst support. As the metals, Zn, Cu, Al, Ni, Co, Ti and Sn were chosen for designing Lewis site in Amberlyst. A part of thus prepared resins were carbonized at 250 ? or 500 ?. In this way, 24 kinds of catalysts were prepared with/without impregnation and/or carbonization. To investigate the activities of the catalysts, sucrose was treated under hydrothermal condition with each catalyst. The catalysts loaded with Cr, Cu, Sn or Ti were favourable for the production of HMF. The increase in yield was high especially for the catalyst loaded with Sn, which indicates that it possesses the properties of both acids. Next, we conducted two-phase reaction to prevent HMF to convert into levulinic acid and formic acid in the presence of Br�nsted acid. The concept lies in the instant extraction of HMF produced in water phase into oil phase to suppress overreaction. By this system, 53.2 % of glucose was successfully converted into HMF at 170 ? and 60 min of reaction time. We also confirmed the catalyst could be used repeatedly with the original activity. Thus, it was clarified that the proposed two-phase reaction system with Amberlyst catalyst supported by Sn was useful for selective production of HMF from glucose.

Catalytic conversion of saccharide into 5-hydroxymethylfurfural using cation exchanged resin

248th National Meeting (2014)

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