Key Words:Carbon dioxide;Activated carbon - Adsorption isotherms - Dispersions - Fabrication - Gas adsorption - Magnesia - Scanning electron microscopy
Abstract:Activated carbon (AC) supported MgO (MgO@AC) for CO<inf>2</inf> capture has been facilely prepared with Mg(NO<inf>3</inf>)<inf>2</inf> as precursor by a solid-state heat dispersion method. The prepared MgO@AC adsorbents with different magnesium loadings were characterized by X-ray diffraction (XRD), N<inf>2</inf> adsorption/desorption and scanning electron microscope (SEM), and were investigated for the CO<inf>2</inf> adsorption capacity, CO<inf>2</inf> adsorption selectivity and cyclic stability. The characterization results reveal that the precursor of Mg(NO<inf>3</inf>)<inf>2</inf> can be highly dispersed on the surfaces of the AC support and converted to MgO during the activation process at high temperatures. The experimental results show that the MgO@AC adsorbent with the MgO loadings of 5 mmol/g AC support achieves a high CO<inf>2</inf> adsorption capacity, high CO<inf>2</inf>/N<inf>2</inf> adsorption selectivity and excellent reversibility. Its good adsorption performance and facile fabrication process make it a promising adsorbent for CO<inf>2</inf> capture from flue gases. In addition, the isosteric heat of CO<inf>2</inf> adsorption on this adsorbent was calculated from the CO<inf>2</inf> adsorption equilibrium isotherms at different temperatures using the Clausius–Clapeyron equation, the values are in the range of 45.4–20.1 kJ/mol.<br/> © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
Volume:
Issue:4
Translation or Not:no