Adsorption of Carbon Dioxide, Methane, and Nitrogen Gases onto ZIF Compounds with Zinc, Cobalt, and Zinc/Cobalt Metal Centers

ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 are utilized in adsorbing nitrogen (N₂), methane (CH₄), and carbon dioxide (CO₂) gases at temperatures between 25 and 55°C and pressures up to ~1 MPa. Equilibrium adsorption isotherms and adsorption kinetics are studied. The dual-site Langmuir equation is employed to correlate the nonisothermal adsorption equilibrium behavior. Generally, N₂ showed the lowest equilibrium adsorption quantity on the three samples, whereas CO₂ showed the highest equilibrium adsorption capacity. Amid the ZIF samples, the biggest adsorption quantities of N₂ and CH₄ were onto Zn/Co-ZIF-8, whereas the highest adsorption quantity of CO₂ was on ZIF-8. The isosteric heats of adsorbing these gases on ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 were examined. Moreover, the overall mass transfer coefficients of adsorption at different temperatures were investigated. 

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Published in: Journal of Nanomaterials
License: http://creativecommons.org/licenses/by/4.0
See article on publisher's website: http://dx.doi.org/10.1155/2019/6130152