Continuous synthesis of ZIF-67 by a microchannel mixer: A recyclable approach

• Published in: Microporous and mesoporous materials Vol. 327; p. 111423
• Main Authors: Zhang, Meizhuo, Yu, Zhiquan, Sun, Zhichao, Wang, Anjie, Zhang, Jian, Liu, Ying-Ya, Wang, Yao
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.11.2021
• Subjects: Flow synthesis; Metal-organic framework; Microfluidic; Zeolitic imidazole framework; ZIF-67; Metal-organic framework; Zeolitic imidazole framework; Flow synthesis; ZIF-67; Microfluidic
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2021.111423

Microfluidic synthesis of a Zeolitic-Imidazole Framework ZIF-67 at ambient temperature and pressure is reported. With a metal/ligand/triethylamine (TEA) ratio of 1/4/4, ZIF-67 can be produced with a high space-time yield (STY) of 57000 kg m−3 d−1 and a production rate of 285 g h−1 in ethanol. It can be produced with a similar STY in water solution as well. Given the importance of sustainable synthesis, the recycling process of the mother liquor was investigated. The mother liquor can be recycled 5 times with high yield and crystallinity in ethanol, but not applicable in water solution. The morphology and particle sizes of ZIF-67 can be regulated in a controlling manner in a water-ethanol mixed solvent. Moreover, the influence of TEA on the characteristic of the ZIF-67 structure was investigated in detail. [Display omitted] •A microfluidic strategy to produce ZIF-67 at ambient temperature and pressure is provided.•The mother liquor of ethanol can be recycled 5 times with high yield and crystallinity.•The particle sizes can be regulated in the nanometer range using an ethanol-water mixed solvent.