1 research outputs found
Enhancement in CO<sub>2</sub> Adsorption on Hydrotalcite-based Material by Novel Carbon Support Combined with K<sub>2</sub>CO<sub>3</sub> Impregnation
In
recent years, a great deal of interest has been shown for high-temperature
adsorption of CO<sub>2</sub> on hydrotalcite-like compounds (HTlcs).
Numerous efforts have been undertaken to enhance the CO<sub>2</sub> capture property of HTlcs, including alkali-metal impregnation,
use of support materials, and modification of chemical composition.
The present work demonstrates the applicability of coal-derived graphitic
material (CGM) as an effective support for neat as well as K<sub>2</sub>CO<sub>3</sub>-promoted Mg–Al HTlc, enhancing the CO<sub>2</sub> adsorption capacity. Both surface area and basic site density affect
the adsorption capacity. The K<sub>2</sub>CO<sub>3</sub>-promoted
CGM-supported Mg–Al HTlc exhibited a fresh adsorption capacity
of 1.10 mmol g<sup>–1</sup> at 300 °C under a total pressure
of 1 bar. After the initial drop, it maintained an average working
capacity of 0.42 mmol g<sup>–1</sup> during nine cycles of
adsorption–desorption in the temperature range of 300–400
°C. The Yoon–Nelson kinetic model fit well with the experimental
data