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bce ›› 2016, Vol. 50 ›› Issue (6): 23-31.doi: 10.3969/j.issn.1673-5854.2016.06.004

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One-pot Preparation of High Fructose Syrup Directly from Starch over Solid Acid Catalyst

CHEN Hui-hui, JIANG Ye-tao, SUN Yong, LIN Lu   

  1. College of Energy, Xiamen University, Xiamen 361102, China
  • Received:2016-03-24 Online:2016-11-30 Published:2016-12-03

Abstract: The catalytic effects of several supported solid acid catalysts on the direct conversion of starch into high fructose syrup (HFS) in water were studied.Among them, the SO42-/USY solid catalyst,which was prepared by loading sulfuric acid on ultrastable Y zeolite (USY),possessed bifunctional activities for both hydrolysis of starch and isomerization of glucose.It made one-step preparation of HFS from starch into reality and had a good catalytic effect.The preparation conditions of SO42-/USY were optimized.The optimal conditions were 1.5 mol/L H2SO4 and 550℃.An optimized HFS yield(86.18%),containing 58.34% glucose and 27.84% fructose(mass fraction),was obtained under the conditions of 5% starch(starch/water),30% catalyst(based on the mass of starch),150℃,1 h and 400 r/min on the catalyst of optimal SO42-/USY.The USY catalyst had high specific surface area and porosity characterized by physical adsorption technique.This enabled the sulfuric acid to be effectively adsorbed on the USY surface by impregnation and calcination.Meanwhile,the catalysts were characterized by NH3 temperature programmed desorption and elemental analysis to find that the decrease of catalytic activity resulted from carbon deposition on the catalysts and the loss of SO42-.Therefore, the catalytic activity of SO42-/USY could be effectively recovered by calcining (removal carbon on the surface of catalyst) and impregnating in sulfuric acid (increase SO42-).

Key words: starch, high fructose syrup, solid acid, SO42-/USY, hydrolysis, isomerization

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