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Investigation of ZIF‐78 Morphology and Feed Composition on the Mixed Gas CO 2 /N 2 Separation Performance in Mixed Matrix Membranes
Author(s) -
Essen Machiel,
Akker Luuk,
Thür Raymond,
Houben Menno,
Vankelecom Ivo F. J.,
Borneman Zandrie,
Nijmeijer Kitty
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202001478
Subject(s) - zeolitic imidazolate framework , membrane , materials science , sorption , chemical engineering , morphology (biology) , imidazolate , gas separation , selectivity , solubility , metal organic framework , aspect ratio (aeronautics) , thermal diffusivity , polymer , analytical chemistry (journal) , chromatography , organic chemistry , composite material , chemistry , adsorption , thermodynamics , biochemistry , physics , biology , engineering , genetics , catalysis
In this work, the influence of the zeolitic imidazolate framework 78 (ZIF‑78) morphology, with 1D pores, on the mixed matrix membrane (MMM) CO 2 /N 2 mixed gas separation performance is investigated as well as the influence of the feed composition and pressure. Low aspect ratio and a high aspect ratio ZIF‑78 particles are synthesized and incorporated in Matrimid with 10 and 20 wt% additive content. High pressure CO 2 and N 2 sorption measurements show that both the low and high aspect ratio ZIF‑78 metal–organic frameworks (MOFs) exhibit similar sorption behavior. The incorporation of ZIF‑78 into Matrimid results in improved CO 2 permeabilities up to 39%, without compromising the selectivity, relative to native Matrimid membranes. Both at low and high CO 2 partial pressures, the MMMs containing the different ZIF‑78 morphologies show equal CO 2 permeabilities, indicating that the ZIF‑78 morphology and consequently the aspect ratio are insignificant for these particular MMMs, contradicting previous observations in literature. Thus, depending on the MOF/polymer system, the MOF morphology and aspect ratio can be considered as a design aspect. Finally, a clear influence of feed composition and pressure on the MMM solubility coefficient and diffusivity is observed, emphasizing the importance of the mixed gas composition and measurement conditions.