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论文类型：期刊论文

发表时间：2013-07-15

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：SCIE、EI、ESI高被引论文

卷号：228

页面范围：398-404

ISSN号：1385-8947

关键字：Metal-organic frameworks; Core-shell microspheres; Microreactor; Magnetic particles

摘要：A facile synthesis strategy for preparing Fe3O4@ZIF-8 magnetic core-shell microspheres has been successfully developed. The procedure involves first pre-treating the magnetic cores with an anionic polyelectrolyte to alter the surface charge of the particles and adsorb Zn2+ cations to initiate nucleation and then growing a thin layer of ZIF-8 to form a highly reactive, magnetic core-shell microsphere (Fe3O4@ZIF-8). The characterization by various techniques indicates that ZIF-8 shell is continuous and has an average thickness of around 100 nm. The Fe3O4@ZIF-8 microspheres as catalysts could be easily filled into a capillary microreactor with the help of an external magnetic field. The microreactor demonstrates excellent catalytic activity at a shorter residence time for Knoevenagel condensation reaction of benzaldehyde and ethyl cyanoacetate. (C) 2013 Elsevier B.V. All rights reserved.