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生物质化学工程 ›› 2022, Vol. 56 ›› Issue (1): 7-12.doi: 10.3969/j.issn.1673-5854.2022.01.002

• 研究报告 • 上一篇    下一篇

金属离子催化葡萄糖异构化和脱水反应特性研究

张永昭1(), 季佳佳1, 汪洋1, 李宏威1, 刘松晖1, 王文德2   

  1. 1. 杭州职业技术学院 生态健康学院,浙江 杭州 310018
    2. 杭州油脂化工有限公司, 浙江 杭州 311228
  • 收稿日期:2020-11-28 出版日期:2022-01-30 发布日期:2022-01-18
  • 作者简介:张永昭(1980—),男,山东临朐人,副教授,博士,主要从事生物质材料的合成、催化等研究工作;E-mail:zhangyzhao@163.com
  • 基金资助:
    浙江省教育厅一般科研项目(Y201943008);杭州市科技发展计划项目(20170432B25)

Catalytic Characteristics of Metal Ions for Glucose Isomerization and Dehydration

Yongzhao ZHANG1(), Jiajia JI1, Yang WANG1, Hongwei LI1, Songhui LIU1, Wende WANG2   

  1. 1. Ecology and Health Institute, Hangzhou Vocational & Technical College, Hangzhou 310018, China
    2. Hangzhou Grease Chemical Co.Ltd., Hangzhou 311228, China
  • Received:2020-11-28 Online:2022-01-30 Published:2022-01-18

摘要:

以金属氯化物为催化剂,研究金属离子对葡萄糖异构化和脱水反应的催化特性。考察金属离子种类、用量和温度对反应过程的影响,用动力学模型拟合实验数据,定量分析金属离子的催化规律。葡萄糖脱水制备HMF的反应是一个串联反应,基于此机理构建的动力学模型能准确描述各组分浓度随时间的变化。Ni2+、Cr3+和Sn4+具有良好的催化活性,但3种金属离子呈现不同的催化特性。Sn4+的葡萄糖转化速率最快,Ni2+最慢,但Sn4+的副反应速率常数是Ni2+的约20倍。实验范围内,增加Ni2+用量,葡萄糖异构化和副反应速率加快,但对果糖脱水过程没有催化活性。增加Cr3+用量能显著提升葡萄糖异构化速率,对其它反应影响不大。随着Sn4+用量的增大,各步反应速率均加快,但整个反应过程中的副反应的严重程度有所降低。反应速率常数随温度的变化规律遵循Arrhenius模型,对Ni2+而言,升高温度更能促进果糖副反应的发生;金属离子为Cr3+时,升高温度有利于果糖脱水生成HMF;而对于Sn4+,升高温度则更有利于葡萄糖的异构化。

关键词: 金属离子, 葡萄糖, 异构化, 果糖, 5-羟甲基糠醛

Abstract:

The catalytic characteristics of metal ions for glucose isomerization and dehydration were investigated with metal chloride as catalyst. The influences of metal ion category, content and temperature on reaction process were studied. The reaction kinetic model was applied to correlate experimental data to analyze catalytic characteristics quantitatively. The process of glucose to HMF was a tandem reaction, and the kinetic model based on this mechanism could simulate the reaction accurately. Ni2+, Cr3+ and Sn4+ possessed good catalytic activity for glucose conversion, among which the catalyst activity of Sn4+ was the highest, and that of Ni2+ was the lowest. The kinetic constant of side reaction of Sn4+ was about 20 times of that of Ni2+. For Ni2+, reaction rate of glucose isomerization and side reaction increased, yet the catalytic activity for fructose dehydration to HMF was negligible with the increasing of Ni2+ content. Increasing of Cr3+ could enhance reaction rate of glucose isomerization significantly, and almost had no effect on other reactions. With the increasing of Sn4+ content, reaction rate of all steps increased, yet the intensity of side reaction would decrease. The influence of temperature on reaction constants followed the Arrhenius model. Higher temperature was beneficial to the side reaction, fructose dehydration and glucose isomerization respectively, when Ni2+, Cr3+ and Sn4+ were used, respectively.

Key words: metal ion, glucose, isomerization, fructose, 5-hydroxymethylfurfural

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