The Application of Biochar for CO2 Capture: Influence of Biochar Preparation and CO2 Capture Reactors Article Swipe
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· 2023
· Open Access
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· DOI: https://doi.org/10.1021/acs.iecr.3c00445
· OA: W4382600535
This work investigates three types of biochar (bamboo charcoal, wood pellet, and coconut shell) for postcombustion carbon capture. Each biochar is structurally modified through physical (H<sub>2</sub>O, CO<sub>2</sub>) and chemical (ZnCl<sub>2</sub>, KOH, H<sub>3</sub>PO<sub>4</sub>) activation to improve carbon capture performance. Three methods (CO<sub>2</sub> adsorption isotherms, CO<sub>2</sub> fixed-bed adsorption, and thermogravimetric analysis) are used to determine the CO<sub>2</sub> adsorption capacity. The results show that a more than 2.35 mmol·g<sup>-1</sup> (1 bar, 298 K) CO<sub>2</sub> capture capacity was achieved using the activated biochar samples. It is also demonstrated that the CO<sub>2</sub> capture performance by biochar depends on multiple surface and textural properties. A high surface area and pore volume of biochar resulted in an enhanced CO<sub>2</sub> capture capacity. Furthermore, the O*/C ratio and pore width show a negative correlation with the CO<sub>2</sub> capture capacity of biochars.
