Understanding the Anomalous Alkane Selectivity of ZIF-7 in the Separation of Light Alkane/Alkene Mixtures

C2 and C3 alkanes are selectively adsorbed from mixtures over the corresponding alkenes on the zeolite imidazolate framework ZIF‐7 through a gate‐opening mechanism. As a result, the direct production of the pure alkene upon adsorption and the pure alkane upon desorption in packed columns is possible...

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Bibliographic Details
Published in:Chemistry : a European journal Vol. 17; no. 32; pp. 8832 - 8840
Main Authors: van den Bergh, Johan, Gücüyener, Canan, Pidko, Evgeny A., Hensen, Emiel J. M., Gascon, Jorge, Kapteijn, Freek
Format: Journal Article
Language:English
Published: Weinheim WILEY-VCH Verlag 01.08.2011
WILEY‐VCH Verlag
Wiley Subscription Services, Inc
Subjects:
Adsorption
alkanes
Alkenes
Chemistry
Desorption
metal-organic frameworks
Performance assessment
separation
ZIF-7
ISSN:0947-6539, 1521-3765, 1521-3765
Online Access:Get full text
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Summary:C2 and C3 alkanes are selectively adsorbed from mixtures over the corresponding alkenes on the zeolite imidazolate framework ZIF‐7 through a gate‐opening mechanism. As a result, the direct production of the pure alkene upon adsorption and the pure alkane upon desorption in packed columns is possible. Herein, a detailed investigation of the step‐wise adsorption and separation of alkanes and alkenes is presented, together with a rigorous performance assessment. A molecular picture of the gate‐opening mechanism underlying the unprecedented selectivity towards alkane adsorption is proposed based on DFT calculations and a thermodynamic analysis of the adsorption–desorption isotherms. Going their separate ways: The separation of short‐chain alkanes and alkenes is accomplished by selective adsorption on the zeolite imidazolate framework ZIF‐7 through a gate‐opening mechanism. The difference in the partial pressure at which alkenes and alkanes are taken up by ZIF‐7 makes it an excellent candidate for the design of simpler alkane/alkene PSA‐based separation schemes, for which fewer cycles and less energy will be required.
Bibliography:European Community's Seventh Framework Programme
istex:6401A84D8B2078575A41BEF74D6DF6E889B85946
the Netherlands National Science Foundation
SenterNovem
ArticleID:CHEM201100958
ark:/67375/WNG-G7TCMFXG-D
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0947-6539
1521-3765
1521-3765
DOI:10.1002/chem.201100958