TY - JOUR

T1 - Enhanced Propylene/Propane Separation via Aniline-Decorated ZIF-8 Membrane

T2 - Lattice Rigidity Adjustment and Adsorption Site Introduction

AU - Zhang, Xin

AU - Hai, Guangtong

AU - Yao, Yujian

AU - Zhang, Zheng

AU - Cao, Qingbin

AU - Tan, Hongxin

AU - Ding, Li

AU - Han, Jiuli

AU - Wei, Yanying

AU - Caro, Jürgen

AU - Wang, Haihui

N1 - Publisher Copyright: © 2024 Wiley-VCH GmbH.

PY - 2024/11/25

Y1 - 2024/11/25

N2 - Metal–organic framework (MOF)-based membranes excel in molecular separation, attracting significant research interest. The crystallographic microstructure and selective adsorption capacity of MOFs closely correlate with their gas separation performance. Here, aniline was added to the ZIF-8 synthesis in varying concentrations. Aniline, encapsulated within ZIF-8 cavities, interacts strongly with the 2-methylimidazole linker, resulting in both a shift in crystallographic phase from I_43 m to Cm in Rietveld refinement of X-ray diffraction (XRD) patterns and the selective adsorption behavior between propylene and propane. Consequently, an aniline decorative ZIF-8 (Anix-ZIF-8) membrane was prepared using a fast current-driven synthesis method, which exhibits good propylene/propane separation selectivity of up to 85. Calculation of the interaction energy between aniline and the various crystallographic phases of ZIF-8 using density functional theory (DFT) further verifies that aniline not only promotes the formation of crystallographic Cm phase, but also enhances the adsorption selectivity of propylene over propane. Aniline modification effectively tunes the crystallographic microstructure of ZIF-8, thereby, improving molecular sieving capabilities.

AB - Metal–organic framework (MOF)-based membranes excel in molecular separation, attracting significant research interest. The crystallographic microstructure and selective adsorption capacity of MOFs closely correlate with their gas separation performance. Here, aniline was added to the ZIF-8 synthesis in varying concentrations. Aniline, encapsulated within ZIF-8 cavities, interacts strongly with the 2-methylimidazole linker, resulting in both a shift in crystallographic phase from I_43 m to Cm in Rietveld refinement of X-ray diffraction (XRD) patterns and the selective adsorption behavior between propylene and propane. Consequently, an aniline decorative ZIF-8 (Anix-ZIF-8) membrane was prepared using a fast current-driven synthesis method, which exhibits good propylene/propane separation selectivity of up to 85. Calculation of the interaction energy between aniline and the various crystallographic phases of ZIF-8 using density functional theory (DFT) further verifies that aniline not only promotes the formation of crystallographic Cm phase, but also enhances the adsorption selectivity of propylene over propane. Aniline modification effectively tunes the crystallographic microstructure of ZIF-8, thereby, improving molecular sieving capabilities.

KW - adsorption sites

KW - lattice rigidity

KW - Membrane separation

KW - metal–organic frameworks (MOFs)

KW - molecule sieving

UR - http://www.scopus.com/inward/record.url?scp=85207401620&partnerID=8YFLogxK

U2 - 10.1002/anie.202411440

DO - 10.1002/anie.202411440

M3 - Article

C2 - 39261286

AN - SCOPUS:85207401620

VL - 63

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

SN - 1433-7851

IS - 49

M1 - e202411440

ER -