Nano-gate opening pressures for the adsorption of isobutane, n-butane, propane, and propylene gases on bimetallic Co-Zn based zeolitic imidazolate frameworks
Author | Awadallah-F, Ahmed |
Author | Hillman, Febrian |
Author | Al-Muhtaseb, Shaheen A. |
Author | Jeong, Hae-Kwon |
Available date | 2022-11-28T08:18:28Z |
Publication Date | 2019 |
Publication Name | Dalton Transactions |
Resource | Scopus |
Resource | 2-s2.0-85063724700 |
Abstract | In this article, zeolitic-imidazolate framework-8 (ZIF-8) and its mixed metal CoZn-ZIF-8 were synthesized via a rapid microwave method. The products were characterized by Raman spectroscopy, XPS, XRD, EDX, TEM, NanoSEM, TGA, and DSC. The gas adsorption properties of samples were determined using C3 and C4 hydrocarbons, including propane, propylene, isobutane and n-butane at a temperature of 25 °C. The adsorption equilibrium and kinetics of these gases on various ZIFs were studied. It was noted that ZIF-8 and mixed metal CoZn-ZIF-8 samples start to adsorb these gases after certain pressures which are believed to result in the opening of their nano-gates (i.e., 6-membered rings) to allow the entry of gas molecules. The nanogate opening pressure value (p0) for each ZIF towards different gases was determined by fitting adsorption equilibrium data against a modified form of the Langmuir adsorption isotherm model. It was observed that the value of p0 differs significantly for each gas and to various extents for various ZIFs. Therefore, it is possible that the distinct values of p0 afford a unique technique to separate and purify these gases at the industrial scale. The overall mass transfer coefficient values of the adsorption process were also investigated. |
Sponsor | This publication was made possible by the NPRP awards (NPRP 08-014-2-003 and NPRP-8-001-2-001) from the Qatar National Research Fund (a member of The Qatar Foundation). H. K.-J. acknowledges support from the National Science Foundation (CMMI-1561897). The statements made herein are solely the responsibility of the authors. Technical support from the Department of Chemical Engineering, the Central Laboratory Unit (CLU) and the Gas Processing Centre (GPC) at Qatar University is also acknowledged. |
Language | en |
Publisher | Royal Society of Chemistry |
Subject | Mixed metal CoZn-ZIF-8 nanogate opening pressure Adsorption equilibrium Adsorption kinetics Fast microwaves technique |
Type | Article |
Pagination | 4685-4695 |
Issue Number | 14 |
Volume Number | 48 |
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