Adsorption of CH4 and CO2 on Cu-BDC metal-organic frame works synthesized using different solvent separation routes

Document Type: Research Paper

Authors

1 Department of chemical engineering, South Tehran Branch, Islamic Azad University

2 Research Institute of Petroleum Industry(RIPI),

3 Researcher and Elites club, Science and Research Branch, Islamic Azad University

4 Nanotechnology Research Center, Research Institute of Petroleum Industry

10.22078/jpst.2020.4023.1638

Abstract

In this work, Cu-BDC (copper terephthalate) was synthesized by two different solvent separation procedures and characterized by X-ray diffraction (XRD), Brunauer-Emmet-Telller (BET) and thermo gravimetric analyze (TGA). Equilibrium adsorption measurements were performed for CH4 and CO2 gases in the pressure range of 0 to 50 bar at two various temperatures (293 and 323 K) and experimental adsorption data were modeled with adsorption isotherms. The sample synthesized by new solvent separation procedure had 918 m2/gr surface area and 0.42 cm3/gr pore volume that there was 45% and 50% higher than traditional method. In addition, it shown a desired CO2 and CH4 adsorption capacity (16.72 and 13.23 mmol gr-1) compared to other conventional MOFs and its methane adsorption value was near to DOE (Department of Energy) targets. Selectivity of CO2/CH4 was determined by IAST (ideal adsorbed solution theory) based on the sorption test data of single component to investigate the application of the synthesized materials. Finally adsorption enthalpy of adsorbates on two samples was calculated using the Clausius-Clapeyron equation based on the isotherms at two various temperatures (293 and 323K).

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