磁性纳米固体碱催化剂MgAl-OH-LDHs/NiFe2O4的合成、表征与性能研究

化学学报 ›› 2004, Vol. 62 ›› Issue (8): 750-756. 上一篇下一篇

研究论文

磁性纳米固体碱催化剂MgAl-OH-LDHs/NiFe₂O₄的合成、表征与性能研究

张慧, 徐彦红, EVANS David G., 段雪

北京化工大学可控化学反应科学与技术基础教育部重点实验室, 北京, 100029

投稿日期:2003-10-10 修回日期:2003-12-30 发布日期:2014-02-18
通讯作者: 段雪,E-mail:duanx@mail.buct.edu.cn E-mail:duanx@mail.buct.edu.cn
基金资助:
国家自然科学基金(No.20371006)资助项目.

Synthesis, Characterization and Properties of a Nano-scale Magnetic Solid Base Catalyst MgAl-OH-LDHs/NiFe₂O₄

ZHANG Hui, XU Yan-Hong, EVANS David G., DUAN Xue

Ministry of Education Key Laboratory of Science and Technology of Controllable Chemical Reactions, Box 98, Beijing University of Chemical Technology, Beijing 100029

Received:2003-10-10 Revised:2003-12-30 Published:2014-02-18

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摘要/Abstract

提出用镁铝水滑石包覆镍铁尖晶石,制备磁性纳米固体碱催化剂MgAl-OH-LDHs/NiFe₂O₄.用XRD, IR, TG-DTA, BET, XPS, VSM和TEM等技术及丙酮缩合反应表征了催化剂的结构和性能.结果表明该催化剂具有以NiFe₂O₄为磁核,以MgAl-OH-LDHs为Brönsted碱催化活性相,通过Mg-O-Fe(Ni)和/或Al-O-Fe(Ni)连接于磁核上的包覆结构,给出了该催化剂的结构模型.该催化剂用于丙酮缩合反应,273 K双丙酮醇转化率略高于MgAl-OH-LDHs,然而经外加磁场回收所得回收率大幅度提高,再次用于该反应仍保持较高的催化活性.

关键词: 磁性, 固体碱, 纳米, 包覆, 结构模型, 磁回收, 丙酮缩合

A nano-scale magnetic solid base catalyst involving NiFe₂O₄ spinel as the magnetic core affording magnetism coated with MgAl-OH-LDHs providing basic sites has been designed and synthesized. The structure and properties of the catalyst have been characterized by using XRD, IR, TG-DTA, BET, XPS, VSM, TEM and self-condensation of acetone. The results manifest that the magnetic solid base catalyst MgAl-OH-LDHs/NiFe₂O₄ has formed the hydroxyl layered double hydroxide structure with high magnetism through calcinations/rehydration processes, and the structure model of MgAl-OH-LDHs/NiFe₂O₄ has been presented. The catalyst has high catalytic activity in self-condensation of acetone. The diacetone alcohol conversion reaches 14.2% at 273 K, which is slightly higher than that of MgAl-OH-LDHs. However, after easy recovery through an exterior magnetic field, the mass recovery of MgAl-OH-LDHs/NiFe₂O₄ has been improved greatly, and considerable activity has been maintained in the second run.

Key words: magnetic property, solid base, nano-scale, coated, structure model, magnetic reclaim, aldol condensation of acetone

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张慧, 徐彦红, EVANS David G., 段雪. 磁性纳米固体碱催化剂MgAl-OH-LDHs/NiFe₂O₄的合成、表征与性能研究[J]. 化学学报, 2004, 62(8): 750-756.

ZHANG Hui, XU Yan-Hong, EVANS David G., DUAN Xue. Synthesis, Characterization and Properties of a Nano-scale Magnetic Solid Base Catalyst MgAl-OH-LDHs/NiFe₂O₄[J]. Acta Chimica Sinica, 2004, 62(8): 750-756.

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磁性纳米固体碱催化剂MgAl-OH-LDHs/NiFe₂O₄的合成、表征与性能研究

Synthesis, Characterization and Properties of a Nano-scale Magnetic Solid Base Catalyst MgAl-OH-LDHs/NiFe₂O₄

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