Modelling and thermodynamic properties of pure CO2 and flue gas sorption data on South African coals using Langmuir,Freundlich,Temkin,and extended Langmuir isotherm models
Major Mabuza1
Kasturie Premlall2
Michael O.Daramola3
1.Department of Chemical Engineering,Faculty of Engineering and Technology,Vaal University of Technology,P.O.Box 3595,Secunda 2302,South Africa;Department of Chemical,Metallurgical and Materials Engineering,Faculty of Engineering and the Built Environment,Tshwane University of Technology,Private Bag X680,Pretoria 0001,South Africa2.Department of Chemical,Metallurgical and Materials Engineering,Faculty of Engineering and the Built Environment,Tshwane University of Technology,Private Bag X680,Pretoria 0001,South Africa3.Department of Chemical Engineering,Faculty of Engineering,Built Environment and Information Technology,University of Pretoria,Hatfield,Pretoria 0028,South Africa
摘要：Carbon sequestration in unmineable coal seams has been proposed as one of the most attractive technologies to mitigate carbon dioxide(CO2)emissions in which CO2 is stored in the microporous structure of the coal matrix in an adsorbed state.The CO2 adsorption process is hence considered one of the more effective methodologies in environmental sciences.Thus,adsorption isotherm measurements and modelling are key important scientific measures required in understanding the adsorption system,mechanism,and process optimization in coalbeds.In this paper,three renowned and reliable adsorp-tion isotherm models were employed including Langmuir,Freundlich,and Temkin for pure CO2 adsorption data,and the extended-Langmuir model for multicomponent,such as flue gas mixture-adsorption data as investigated in this research work.Also,significant thermodynamics properties including the standard enthalpy change(AH°),entropy change(AS°),and Gibbs free energy(AG°)were assessed using the van't Hoff equation.The statistical evaluation of the goodness-of-fit was done using three(3)statistical data analysis methods including correlation coefficient(R2),standard deviation(o),and standard error(SE).The Langmuir isotherm model accurately represent the pure CO2 adsorption on the coals than Freundlich and Temkin.The extended Langmuir gives best experimental data fit for the flue gas.The thermodynamic evaluations revealed that CO2 adsorption on the South African coals is feasible,spontaneous,and exothermic;and the adsorption mechanism is a combined physical and chemical interaction between the adsorbate and the adsorbent.
机标关键词：freundlichlangmuirmodelsdatapureafricancoalsextended
论文发表日期：2022-06-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：15( 136-150 )
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