高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (7): 1347.

• 研究论文 • 上一篇    下一篇

磁性纳米固体超强酸的合成、表征及性能

张密林1, 王君1, 梅长松1, 景晓燕1, 段雪2   

  1. 1. 哈尔滨工程大学化学工程系, 哈尔滨 150001;
    2. 教育部可控化学反应科学与技术基础重点实验室, 北京 100029
  • 收稿日期:2001-06-19 出版日期:2002-07-24 发布日期:2002-07-24
  • 通讯作者: 张密林(1955年出生),男,博士,教授,博士生导师,从事固体材料化学研究.E-mail:Zhangml@hrbeu.edu.cn E-mail:Zhangml@hrbeu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20076003);中国石油化学总公司资助项目(批准号:X5000068);教育部可控化学反应科学与技术基础重点实验室基金资助

Synthesis, Characterization and Properties of Magnetic Nanometer-sized Solid Superacid

ZHANG Mi-Lin1, WANG Jun1, MEI Chang-Song1, JING Xiao-Yan1, DUAN Xue2   

  1. 1. Department of Chemical Engineering, Harbin Engineering University, Harbin 150001, China;
    2. Key Lab of Science and Technology of Controllable Chemical Reaction Ministry of Education, Beijing 100029, China
  • Received:2001-06-19 Online:2002-07-24 Published:2002-07-24

PDF (PC)

被引次数

60

摘要： 首次制备了SO42-/Co0.5Fe2.5O4-ZrO2磁性固体超强酸,利用TEM,DTA,XRD和FTIR等手段研究了Co0.5Fe2.5O4磁性基质对ZrO2的粒子大小、晶化温度与结构的影响.考察了磁性固体超强酸的催化性能及催化剂的寿命、回收率和磁性.结果表明,引入Co0.5Fe2.5O4磁性基质不但赋予催化剂以磁性,而且在固体超强酸形成过程中延迟了ZrO2由四方晶相向单斜晶相的转变,有助于稳定样品表面的含硫物种,磁性固体超强酸对酯化反应具有较高的催化活性,可活化再生,并保持磁性.

关键词: 磁性, 固体超强酸, 纳米粒子, 催化剂

Abstract: In this paper, magnetic solid acid catalyst of SO42-/Co0.5Fe2.5O4-ZrO2 with different molar ratios has been synthesized, and the influence of magnetic substrates Co0.5Fe2.5O4 on particle size, crystallizing temperature, and crystal structure of ZrO2 was investigated. The catalytic activity of the magnetic solid acid was studied for esterification reaction, and life, recovery and variation of magnetic property of the catalyst were tested. The results show that the addition of the magnetic substrate not only magnetizes but also delay the conversion from ZrO2(t) to ZrO2(m) during the formation of solid superacid, which makes acid sites on the surface of sample more stable and promotes its superacidity and catalytic activity. The conversion of esterification catalyzed by SO42-/Co0.5Fe2.5O4-ZrO2 can reach 97.31% and 74.69% conversion can be obtained after it was used for 6 times in the reaction and after it was regenerated, the conversion reaches 96.25%, meaning that the catalytic activity of this catalyst may be recovered.

Key words: Magnetic property, Solid superacid, Nanometer particle, Catalyst

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