RT Journal Article
T1 Structural Contraction of Zeolitic Imidazolate Frameworks: 												Membrane Application on Porous Metallic Hollow Fibers for Gas Separation
A1 Cacho-Bailo, Fernando
A1 Etxeberría-Benavides, Miren
A1 David, Oana
A1 Téllez, Carlos
A1 Coronas, Joaquín
AB Positive thermal expansion coefficients (TECs) of 52 × 10-6 and 35 × 10-6 K-1 were experimentally calculated in the -116 to 250 °C range for the III-phases of zeolitic imidazolate frameworks (ZIF) ZIF-9(Co) and ZIF-7(Zn), respectively, by means of the unit cell dimensions and volume of the materials in the monoclinic crystal system calculated from the XRD patterns. The unit cell dimensions and volume showed a significant expansion phenomenon as the temperature increased, by as much as 5.5% for ZIF-9-III in the studied range. To exploit the advantages of such thermal behavior, a new approach to the fabrication of ZIF-9-III membranes on thin, flexible, and highly porous nickel hollow fiber (Ni HF) supports by a versatile and easy-controllable microfluidic setup is herein reported. These Ni HF supports result from the sintering of 25-μm Ni particles and display very positive mechanical properties and bending resistance. As compared to the traditional polymer-based HF membranes, the ZIF metal-supported membrane exhibited good durability and robustness throughout its operation in a wide temperature range and after heating and cooling cycles. These benefits derive from (1) the pore-plugging membrane configuration resulting from the high porosity of the support and (2) the similarity between the TECs of the ZIF and the metallic support, both positive, which enhances their mutual compatibility. An increase in the H2/CO2 separation selectivity at low temperatures (as high as 22.2 at -10 °C, along with 102 GPU permeance of H2) was achieved, in agreement with the structural variations observed in the ZIF material.
SN 1944-8244
YR 2017
FD 2017-06-21
LK https://hdl.handle.net/11556/4204
UL https://hdl.handle.net/11556/4204
LA eng
NO Cacho-Bailo , F , Etxeberría-Benavides , M , David , O , Téllez , C & Coronas , J 2017 , ' Structural Contraction of Zeolitic Imidazolate Frameworks : Membrane Application on Porous Metallic Hollow Fibers for Gas Separation ' , ACS applied materials & interfaces , vol. 9 , no. 24 , pp. 20787-20796 . https://doi.org/10.1021/acsami.7b05497
NO Publisher Copyright: © 2017 American Chemical Society.
NO Financial support (Grants MAT2013-40556-R, MAT2016-77290-R) from the Spanish MINECO and FEDER, the Aragón Government (DGA, Grant T05) ,and the European Social Fund is gratefully acknowledged. F.C.-B. acknowledges his DGA predoctoral fellowship.
DS TECNALIA Publications
RD 31 jul 2024