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Chemistry and Industry of Forest Products ›› 2021, Vol. 41 ›› Issue (4): 62-68.doi: 10.3969/j.issn.0253-2417.2021.04.009

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Catalytic Performance of Carbon-based Solid Acid H-Al/AC in Glucose to 5-Hydroxymethylfurfural Reaction

Yadong DU, Chunhui MA, Yu YIN, Wei LI, Sha LUO, Shouxin LIU()   

  1. Material Science and Engineering College, Northeast Forestry University; Key Laboratory of Bio-based Material Science&Technology, Ministry of Education, Harbin 150040, China
  • Received:2021-03-08 Online:2021-08-28 Published:2021-08-31
  • Contact: Shouxin LIU E-mail:liushouxin@126.com


A carbon-based solid acid catalyst(H-Al/AC) containing Brønsted(B) acid and Lewis(L) acid was prepared by H2SO4 sulfonation and AlCl3 immersion using coconut shell activated carbon(AC) as carrier. This catalyst was used to prepare 5-hydroxymethylfurfural(5-HMF) from glucose in a biphasic system(water/2-sec-butylphenol) by hydrothermal rection. The catalyst was characterized by SEM, BET, XRD, NH3-TPD and pyridine infrared to investigate the influence of preparation conditions on the structure and activity of the catalyst. The results showed that the catalyst activity reached the highest after being sulfonated with 98% H2SO4 and immersed in saturated AlCl3 solution for 4 h. The catalyst showed an amorphous carbon structure with the specific surface area of 1 139.31 m2/g, B acid amount 4.213 μmol/g and L acid amount 29.97 μmol/g, respectively. The catalytic performance of the prepared catalyst was investigated for the conversion of glucose to 5-HMF in biphasic system when the ratio of aqueous phase to organic phase was 1:2, and the results showed that the highest 5-HMF yield of 25.14% were obtained at 180℃ for 210 min with 0.025 g of catalyst. The reaction path of glucose conversion to 5-HMF was as follows: glucose was isomerized into fructose under the action of Lewis acid in the aqueous phase. Fructose was dehydrated under the catalysis of Brønsted acid to generate 5-HMF. 5-HMF was extracted into 2-sec-butylphenol(SBP), and the generated water was retained in the aqueous phase. The catalyst cycle stability test showed that the activity of the catalyst was 86% of the initial activity after repeated use for five times.

Key words: carbon-based solid acid, glucose, 5-hydroxymethyl furfural, biphasic system, hydrothermal

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