The Effect of the Modification of Carbon Spheres with ZnCl2 on the Adsorption Properties towards CO2
2022
Iwona Pełech | Piotr Staciwa | Daniel Sibera | Ewelina Kusiak-Nejman | Antoni W. Morawski | Joanna Kapica-Kozar | Urszula Narkiewicz
Zinc chloride and potassium oxalate are often applied as activating agents for carbon materials. In this work, we present the preparation of ZnO/carbon spheres composites using resorcinol-formaldehyde resin as a carbon source in a solvothermal reactor heated with microwaves. Zinc chloride as a zinc oxide source and potassium oxalate as an activating agent were applied. The effect of their addition and preparation conditions on the adsorption properties towards carbon dioxide at 0 °:C and 25 °:C were investigated. Additionally, for all tested sorbents, the CO2 sorption tests at 40 °:C, carried out utilizing a thermobalance, confirmed the trend of sorption capacity measured at 0 and 25 °:C. Furthermore, the sample activated using potassium oxalate and modified using zinc chloride (a carbon-to-zinc ratio equal to 10:1) displayed not only a high CO2 adsorption capacity (2.69 mmol CO2/g at 40 °:C) but also exhibited a stable performance during the consecutive multicycle adsorption&ndash:desorption process.
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