Catalytic Dehydration of Glucose to 5-HMF by Ca-γ-Al2O3 and Acid Solution

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Abstract The method of γ-Al₂O₃ spherical beads doped CaO (Ca-γ-Al₂O₃, beads size 1.8±0.1 mm) coupling with an acid solution was developed for preparing 5-hydroxymethylfurfural (5-HMF) from glucose. The Ca-γ-Al₂O₃ spherical beads were characterized by XRD and BET. Also, the effects of the doping amount of CaO, the concentration of solvent acid, the ratio of dimethyl sulfoxide (DMSO) to water in the solvent, the amount of catalyst, the reaction temperature and time on the catalytic performance were analyzed. Besides, the operational stability of Ca-γ-Al₂O₃ and the catalytic mechanism were evaluated and discussed respectively. The experimental results show that the doping amount of CaO (doping amount10%) has little effect on the pore structure of the particles. Furthermore, 100% glucose conversion and the highest yield of 5-HMF with 58.6% is obtained under the following conditions:0.05 mol·L^-1 acid concentration, V(DMSO):V(H₂O)=3:1, the ratio of glucose to catalyst=2:1 (125 mg:63 mg),the reaction temperature of 140℃ and the reaction time of 3 h. Moreover, after 5 cycles of Ca-γ-Al₂O₃ operation (not calcined), the 5-HMF yield reduces slightly to about 55%, and the leakage of CaO in acidic solution is lower due to the doping approach, which indicate that Ca-γ-Al₂O₃ had good operational stability. Hence, the catalysis mechanism shows that Ca-γ-Al₂O₃ has excellent glucose isomerization ability. The doping of CaO can improve the interaction between the catalyst and glucose and the dehydration process of fructose mainly depends on the catalysis of acid solution.

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	Articles by authors
	Wang Kang
	Jia Chuanqi
	Lin Fang

Keywords： glucose 5-hydroxymethyl furfural calcium oxide aluminum oxide doping

Received 2020-11-14;

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Wang Kang, Jia Chuanqi, Lin Fang.Catalytic Dehydration of Glucose to 5-HMF by Ca-γ-Al₂O₃ and Acid Solution[J] Chemcial Industry and Engineering, 2021,V38(5): 20-26

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