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化学学报
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化学学报 ›› 2002, Vol. 60 ›› Issue (2): 298-304. 上一篇    下一篇

研究论文

新型磁性纳米固体酸催化剂ZrO2/Fe3O4的制备及表征

常铮;郭灿雄;李峰;段雪;张密林   

  1. 北京化工大学.北京(100029);可控化学反应科学与技术基础教育部重点实验室
  • 发布日期:2002-02-15

Preparation adn characterization of the novel magnetic nano-size solid acid catalyst

Chang Zheng;Guo Canxiong;Li Feng;Duan Xue;Zhang Milin   

  1. Beijing Univ Chem Technol, Beijing 100029.Beijing(100029);Harbin.( )
  • Published:2002-02-15

PDF

652

被引次数

143

根据将磁性一材料和固体酸进行组装的设想，成功制备了磁性纳米固体酸催化剂。纳米级样性前体-磁基体(Fe3O4)的磁性、粒子尺寸受到Fe^2^+/Fe^3^+投料比和用于沉淀的NaOH浓度的显著影响；不同复合方法也对磁性固体酸催化剂ZrO2/Fe3O4的酯化催化性能影响显著。XRD，XPS，TEM，比表面积测定，元素组成分析及磁学性能测定等表征结果证实，新型催化剂以磁性材料为核，固体酸催化剂活性组分包覆在其外部形成包覆型的磁性纳米催化剂。该系列催化剂均具有较小的粒子尺寸、较强的磁性及较高的酯化催化活性；并且易于通过磁场进行回收，使用寿命较长。它们对乙酸与正丁醇酯化反应的催化活性随着ZrO2含量增加而提高。催化剂中ZrO2的晶化温度因为Fe3O4的存在而升高，有利于催化剂活性的保持，热处理温度会对催化剂的磁性及催化活性产生影响。

关键词: 纳米相材料, 固体酸, 催化剂, 氧化铁, 氧化锆, 磁性, 酯化, 催化活性

Nano-size cores of Fe3O4 with the strongest magnetism were prepared with a proper feeding ratio of Fe^2^+/Fe^3^+ and a suitable concentration of NaOH solution. Then solid acid ZrO2 was deposited over the magnetic cores to form a novel magnetic nano-size solid acid catalyst: ZrO2/Fe3O4. The new catalysts were characterized by techniques such as XRD, XPS, TEM and by the measurements of specific surface area as well as magnetic properties, etc. They showed high catalytic activities for esterification of acetic acid with butyric mellow. The new catalysts can easily be separated from the reaction system by magnetism.

Key words: NANOPHASE MATERIALS, SOLID ACID, CATALYST, IRON OXIDE, ZIRCONIUM OXIDE, MAGNETISM, ESTERIFICATION, CATALYTIC ACTIVITY

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