Experimental and Theoretical Analysis for the CO2 Adsorption on Hydrotalcite

Abstract

The reduction of emission of carbon dioxide from flue gases can be achieved using post-combustion technologies, such as the adsorption using efficient solid sorbents. In this work, the adsorption of CO 2 on hydrotalcite was studied using dynamical and static methods. The breakthrough curves were obtained at different flow gas and total pressure 1.0 bar, using CO 2 diluted in helium at 29 • C. The experimental data showed that the Freundlich model was more suitable to describe the adsorption equilibrium, and the constants of Freundlich (k = 5.5 × 10 −4 and n = 0.23), are typical for favorable isotherm. The linear driving force model was suitable to describe the breakthrough curves.

Sorption-Enhanced Water-Gas Shift Reaction for Synthesis Gas Production from Pure CO: Investigation of Sorption Parameters and Reactor Configurations

“…All curves exhibit the typically fast initial rise followed by a less pronounced increase of CO 2 uptake as function of the CO 2 pressure, as reported in the literature [48]. This behavior can be fairly described by means of the Freundlich model [22,49]. The optimized Freundlich parameters (Equation (S2)) used for data fitting in Figure 6 are listed in Table S3 and are comparable to other works [43,50,51].…”

Limitations of Breakthrough Curve Analysis in Fixed-Bed Adsorption

“…This concentration front sharpening effect has been largely ignored in the literature, except for a few studies. , In many simulation studies, neither the internal concentration histories nor the bed concentration profiles are shown to verify CPB. Quite possibly, the breakthrough curve from the model is blindly fitted to the experimental breakthrough curve to obtain mass transfer information, like the linear driving force (LDF) mass transfer coefficient, while perhaps limiting itself to dispersion coefficients predicted from known correlations. − The results obtained in such cases may be erroneous because they may have been obtained from experimental results dominated by nonplug conditions or from simulated breakthrough curves that deviated from the expected and real CPB physics due to concentration front sharpening occurring near the exit of the bed.…”

Influence of Alkali Metals (Na, K, and Cs) on CO2 Adsorption by Layered Double Oxides Supported on Graphene Oxide

“…Such a profile is characteristic of a wide distribution of active sites present in the fresh adsorbents and can be fitted to the Freundlich model (1). [23][24][25]8…”