Catalytic conversion of glucose to levulinic acid by solid heteropolyacid salts
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A series of metal-modified heteropolyacid salt catalysts (MXH3-2XPW12O40, M=Zn, Cu, Cs, Ag) were prepared, and the solid heteropolyacid salt Ag3W12O40 was used in hydrolysis of glucose to produce levulinic acid. The surface structures of different heteropolyacid salt catalysts were characterized by means of FTIR, XRD. The surface structures and element relative mass content change of the fresh and used Ag3W12O40 catalyst were also analyzed by means of FTIR, XRD, SEM and EPMA. The effects of such factors as reaction temperature, reaction time, amount of catalyst and glucose concentration on the yield of levulinic acid were investigated. Experimental results showed that the MXH3-2XPW12O40 heteropolyacid salt catalysts kept primary Keggin structure, and Ag3W12O40 catalyst had the structure of Keggin after reuse for several times. It was found that the highest yield of levulinic acid was 81.61% (mole) under the conditions of reaction temperature 200掳C, reaction time 2 h, Ag3PW12O40 catalyst dosage 0.7 g and glucose concentration 40 g·L-1. The catalyst could be used repeatedly. 漏 All Rights Reserved.