改性凹凸棒石催化葡萄糖异构化  

Glucose isomerization catalyzed by modified attapulgite

作　　者：林光品 姚鹏飞[1] 夏青 苏艺 杨凤丽[1] LIN Guangpin;YAO Pengfei;XIA Qing;SU Yi;YANG Fengli(School of Chemistry and Chemical Engineering,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院化学化工学院,江苏常州213001

出　　处：《江苏理工学院学报》2025年第1期108-117,共10页Journal of Jiangsu University of Technology

摘　　要：葡萄糖异构化为果糖对生物质资源利用和工业生产具有重要意义。本文通过AlCl_(3)和MgCl_(2)改性凹凸棒石(Attapulgite,ATP)催化葡萄糖异构化,采用扫描电镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和N_(2)吸附-脱附等方法对改性凹凸棒石形貌和结构等进行表征,采用程序升温脱附(CO_(2)-TPD)对催化剂碱性位点进行分析,对改性前后催化葡萄糖异构化的性能进行测试。结果表明,ATP经MgCl_(2)和AlCl_(3)改性(Mg/Al-ATP)后,催化剂比表面积增加,强碱位点中心数目减少,弱碱中心数目增加,催化葡萄糖异构化性能明显提高,在120℃反应1 h,果糖收率和选择性分别由12.5%和55.3%提高至40.1%和92.7%。通过动力学分析可知,Mg/Al-ATP催化葡萄糖异构化时,反应活化能为42.78 kJ/mol。结合催化剂表征结果可以得知,比表面积和弱碱位点数目的增加为葡萄糖异构化反应提供了充足的空间和活性位点。The isomerization of glucose to fructose is of great significance for the utilization of biomass resources and industrial production.In this paper,glucose isomerization is catalyzed by MgCl_(2) and AlCl_(3) modified attapulgite(ATP).The morphology and structure of the modified attapulgite are characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR)and N_(2) adsorption-desorption methods.The basic sites of the catalyst are analyzed by using CO_(2)-TPD,and the catalytic performance of ATP on glucose isomerization before and after modification is tested.The results showed that after modification of ATP with MgCl_(2) and AlCl_(3)(Mg/Al ATP),the specific surface area of the catalyst increased,the number of strong base sites decreased,the number of weak base sites increased,and the catalytic performance for glucose isomerization was significantly improved.At 120℃ for 1 hour,the yield and selectivity of fructose increased from 12.5% and 55.3% to 40.1% and 92.7%,respectively.According to kinetic analysis,the activation energy of Mg/Al ATP catalyzed glucose isomerization is 42.78 kJ/mol.Based on the characterization results of the catalyst,it can be concluded that the increase in specific surface area and weak base sites provides sufficient space and active sites for the glucose isomerization reaction.

关 键 词：MgCl_(2) AlCl_(3) 凹凸棒石 葡萄糖 异构化 

分 类 号：TQ426[化学工程]