Sequential amine functionalization inducing structural transition in aldehyde-containing zeolitic imidazolate framework: application to gas separation membranes: application to gas separation membranes
Loading...
Identifiers
Publication date
2017
Advisors
Journal Title
Journal ISSN
Volume Title
Publisher
Citations
Export
Abstract
A modification in the gas separation performance of zeolitic imidazolate framework (ZIF)-supported hollow fiber (HF) membranes by means of an imine-condensation functionalization reaction carried out by microfluidics is reported. The accommodation of voluminous amine molecules in the SIM-1, Zn(4-methyl-5-imidazolecarboxaldehyde)2, also known as ZIF-94, sod structure during the functionalization reaction caused the ZIF atoms to be rearranged in a less dense rho structure, with a wider pore diameter and a diminished CO2 affinity. These changes had effects on the membrane performance, resulting in an enhanced CO2 permeance while maintaining a good permeance–selectivity balance. ZIF aldehyde-containing SIM-1 membranes were earlier prepared on the inner side of polymeric P84® HF using a microfluidic approach. The SIM-1 membranes displayed very interesting results in the separation of gas mixtures of great relevance to the natural gas field. High selectivities in the separation of He/CH4 (160), H2/CH4 (136) and CO2/CH4 (38) mixtures were achieved, and these are the first SIM-1 membranes with such a high separation performance to the best of our knowledge. These SIM-1 membranes were in situ stepwise functionalized with long-chain amine solutions, namely, hexyl- and nonylamine. Microfluidics allowed the easy sequential implementation of this post-reaction step in the membrane fabrication procedure. An imine-condensation reaction took place between the aldehyde groups in the 4-methyl-5-imidazolecarboxaldehyde ligand forming SIM-1 and the corresponding amines. The extent of the reaction was analyzed by FTIR, TGA and XRD, together with the changes in the textural properties and the adsorption capacities.
Description
Publisher Copyright: © The Royal Society of Chemistry.
Keywords
Zeolitic imidazolate framework (ZIF) , Supported composite hollow fiber membrane , ZIF-94 , Gas separation , Zeolitic imidazolate framework (ZIF) , Supported composite hollow fiber membrane , ZIF-94 , Gas separation , General Chemistry , General Materials Science , Condensed Matter Physics , Funding Info , Financial support (MAT2013-40556-R, MAT2016-77290-R) from_x000D_ the Spanish MINECO, the Aragón Government (DGA, T05), the_x000D_ European Social Fund and FEDER is gratefully acknowledged. , Financial support (MAT2013-40556-R, MAT2016-77290-R) from_x000D_ the Spanish MINECO, the Aragón Government (DGA, T05), the_x000D_ European Social Fund and FEDER is gratefully acknowledged.
Type
Citation
Cacho-Bailo , F , Etxeberría-Benavides , M , Karvan , O , Téllez , C & Coronas , J 2017 , ' Sequential amine functionalization inducing structural transition in aldehyde-containing zeolitic imidazolate framework: application to gas separation membranes : application to gas separation membranes ' , CrystEngComm , vol. 19 , no. 11 , pp. 1545-1554 . https://doi.org/10.1039/C7CE00086C