Isotherms and thermodynamics of CO2 adsorption on a novel carbon-magnetite composite sorbent

By F. Raganati, M. Alfè, V. Gargiulo, R. Chirone, P. Ammendola. Chemical engineering research & design, 2018

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Abstract In this work, CO2 adsorption on a novel composite material, CB-FM, obtained coating a low-cost carbon black (CB) with magnetite fine particles (FM), has been characterized from the thermodynamic point of view. In particular, the mechanism (isotherm), nature/strength (thermodynamics) of CO2 adsorption has been investigated by performing dynamic breakthrough experiments in a lab-scale fixed bed reactor. The effect of both temperature (18–150 °C) and CO2 partial pressure (0.5–20% vol.) has been investigated. Then, five adsorption models, i.e. Langmuir, Freundlich, Sips, Toth and Dubinin–Radushkevich (D–R) isotherms, were applied to evaluate the feasibility of adsorbate–adsorbent interaction and to describe the CO2 adsorption isotherm in the low pressure region typical of a combustion flue gas. Besides that, the most important thermodynamic properties, i.e. the standard Gibbs free energy, standard enthalpy change and entropy change and isosteric heat of adsorption as a function of surface coverage, were evaluated using van’t Hoff and Clausius–Clapeyron equations.

Subfields: Biomedical Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/76c69ca2f003ea5ef474a3bd7fbc6566303a4e27