Equilibrium and kinetics analysis of carbon dioxide capture using immobilized amine on a mesoporous silica. Issue 3 (23rd July 2012)

• Record Type: Journal Article
• Authors: Monazam, Esmail R.; Shadle, Lawrence J.; Miller, David C.; Pennline, Henry W.; Fauth, Daniel J.; Hoffman, James S.; Gray, McMahan L.
• Is Part Of: AIChE journal. Volume 59:Issue 3(2013:Mar.)
• Page Start: 923
• Page End: 935
• Publication Date: 2012-07-23
• Subjects: Chemical engineering -- Periodicals; Génie chimique -- Périodiques; 660.28
• DOI: 10.1002/aic.13870
• Languages: English
• ISSNs: 0001-1541

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Thermogravimetric analysis is used to study the adsorption kinetics, equilibrium, and thermodynamics of CO₂ on immobilized polyethylenimine sorbent impregnated on a mesoporous silica over the range of 300–390 K and 5–100% CO₂ concentration. Adsorption isotherm models were fitted to the experimental data indicating that a change in adsorption mechanism occurred near 70^°C. Below this temperature, the adsorption data followed the heterogeneous isotherms, while data taken at higher‐temperatures followed isotherms for homogeneous surfaces. Heat of sorption was estimated to be 130 kJ/mole for the low‐temperature regime, but this decreased to 48 kJ/mole above 70^°C. The rate of CO₂ fractional uptake decreased as temperature increased. A phenomenological kinetic model was derived from the Weibull distribution function using a nucleation growth theory to describe the two‐step process. The kinetic model was used to predict the uptake at different operating conditions and resulted in good agreement with experimental data. Published 2012 American Institute of Chemical Engineers AIChE J, 2013</p> </abstract>