Print Email Facebook Twitter Cation influence in adsorptive propane/propylene separation in ZIF-8 (SOD) topology Title Cation influence in adsorptive propane/propylene separation in ZIF-8 (SOD) topology Author Andres Garcia, E. (TU Delft ChemE/Catalysis Engineering) López-Cabrelles, Javier (Universidad de Valencia (ICMol)) Oar-Arteta Gonzalez, L. (TU Delft ChemE/Catalysis Engineering) Roldan Martinez, B. (TU Delft ChemE/Catalysis Engineering) Cano Padilla, M. (TU Delft Applied Sciences; TU Delft ChemE/Catalysis Engineering) Gascon, Jorge (TU Delft ChemE/Catalysis Engineering; King Abdullah University of Science and Technology) Mínguez Espallargas, Guillermo (Universidad de Valencia (ICMol)) Kapteijn, F. (TU Delft ChemE/Catalysis Engineering) Faculty Applied Sciences Date 2019 Abstract Separation of propylene/propane is one of the most challenging and energy consuming processes in the chemical industry. Propylene demand is increasing and a 99.5% purity is required for industrial purposes. Adsorption based solutions are the most promising alternatives to improve the economical/energetic efficiency of the process. Zeolitic Imidazolate Frameworks (ZIFs) combine the desired characteristics from both MOFs and zeolites: tunability and flexibility from metal organic frameworks, and exceptional thermal and chemical stability from zeolites. In order to enlighten the role of the cation in the sodalite ZIF-8 framework for propane/propylene separation, dynamic breakthrough measurements have been performed over ZIF-8(Zn), ZIF-67 (i.e. ZIF-8(Co)) and MUV-3 (i.e. ZIF-8(Fe)), all isostructural materials based on the same linker (2-methylimidazole). Cation substitution has a remarkable influence in the framework flexibility, and, consequently, in SOD-ZIF selectivity for light hydrocarbons. The differences between the crystallographic pore sizes of the material and the molecular dimensions of propane and propylene are so small, that the slightest change in the framework causes notable advantages/disadvantages in the final application. While cobalt is known to promote a more rigid framework resulting in an adsorption selectivity towards propane, iron presents the inverse effect yielding selectivity to propylene. Zinc has an intermediate effect. A threshold pressure in the isotherm is observed for propylene uptake by ZIF-67 at 273 and 298 K, and only at the lower temperature for ZIF-8. Inlet mixture composition does not highly influence the adsorptive selectivity, although it clearly affects the pure hydrocarbon recovery. Over ZIF-67 breakthrough experiments at 298 K yield a temporary pure propylene flow representing 10–15% of the amount fed. ZIF-67 is a promising candidate for propylene/propane adsorptive separation. Subject MUV-3Selective gas adsorptionSeparationZeolitic Imidazolate Framework (ZIFs)ZIF-67ZIF-8 To reference this document use: http://resolver.tudelft.nl/uuid:2180d2ec-6b8d-4ce9-9321-43483a07a67a DOI https://doi.org/10.1016/j.cej.2019.04.094 Embargo date 2021-04-21 ISSN 1385-8947 Source Chemical Engineering Journal, 371, 848-856 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 E. Andres Garcia, Javier López-Cabrelles, L. Oar-Arteta Gonzalez, B. Roldan Martinez, M. Cano Padilla, Jorge Gascon, Guillermo Mínguez Espallargas, F. Kapteijn Files PDF sodZIF_Reviewed_Manuscript2.pdf 672.36 KB Close viewer /islandora/object/uuid:2180d2ec-6b8d-4ce9-9321-43483a07a67a/datastream/OBJ/view