(595d) A Highly Permeable and Selective Aminofunctionalized MOF Cau-1 Membrane for Separation of Molecular Mixture

A highly permeable
and selective aminofunctionalized

MOF CAU-1 membrane for separation of molecular
mixture

Jianhua Yang*^a,b, huimin Yin ^a, Jinqu Wang ^a,
Jinming Lu ^a, Yan Zhang ^a, Jerry Y. S. Lin ^c and Michael Tsapatsis*^b

a:State Key
Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University
of Technology, Dalian, Liaoning, 116024, China. E-mail: yjianhua@dlut.edu.cn; b: Department of Chemical
Engineering and Materials Science,College of Science and Technology, University of
Minnesota, MN55455; c: School for Engineering of Matter, Transport and Energy,
Arizona State University,

Tempe, AZ 85287, USA.

*corresponding authors:Jianhua Yang, E-mail add.: yjianhua@dlut.edu.cn;  Michael Tsapatsis, Tsapa001@umn.edu

                             
Abstract

Metal-organic frameworks are appealing candidates for molecular separationparticularly for CO₂and other molecular mixture separation because
of the high porosity, structural flexibility, pore size and chemical
tailorability as highlighted in several reviews.^1-5
In the form of powders, MOFs have exhibited an unprecedented CO₂
adsorption capacity/selectivity and high CO₂ adsorptive separation
efficiency from N₂ and CH₄. The excellent preferential CO₂
adsorption ability are expected to lead to high CO₂ perm-selectivity
over other gases for MOFs membranes. However, so far only the MOF-5 membrane
reported by Zhao et al. showed efficient separation for CO₂/N₂
mixtures under high pressure and CO₂ content conditions.^6-7
Instead, other reported MOFs membranes including small and large pore size MOFs
membranes have so far shown a poor CO₂/N₂ separation
selectivity around 1 for either single gas or mixture system despite of their
high adsorption selectivity.^8-11There is a long
way to explore MOF membranes with high performance for CO₂ capture.

In the
present work, a continuous and thin
amine-decorated microporous metal-organic framework CAU-1 membrane on
asymmetric a-Al₂O3 support was synthesized and explored for CO2
separation. The obtained CAU-1 membrane was of 2¨C3µm thin and exhibited a high CO2 permeance of up to 1.34 °Á 10^-6 mol m^-2 s^-1 Pa^-1 and a CO₂-N₂ selectivity of 17.4-22.8 for CO₂-N₂ mixtures,
demonstrating for the first time that amino-functionalized
MOF membranes can provide high CO2¨CN2 selectivity and
possess the potential for
CO2 capture from flue gas¹². Separation of other molecular mixture
will be studied as well.

   SHAPE  \* MERGEFORMAT

Fig.1 SEM image of the surface and cross-section
of the CAU-1 membrane (a, b) and EDS mapping of the CAU-1 membrane: green C; red
Al (c, d).

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