TITLE:
Experimental Adsorption and Modelisation of CO2 on Adsorbents Collected from Elborma Field in South Tunisia
AUTHORS:
Souhail Bouzgarrou, Hadi Jedli, Nadra Stiti, Nourdine Hamdi, Khalifa Slimi, Mohamed Bagana
KEYWORDS:
Adsorption Selectivity, Geologic Materials, Surface Area Analysis, Elution Chromatography, Langmuir, Freundlich Modelisation
JOURNAL NAME:
Journal of Surface Engineered Materials and Advanced Technology,
Vol.5 No.1,
January
7,
2015
ABSTRACT: In order to select the best adsorbant for CO2 sequestration, this study deals the interaction between
clay, Triassic sandstone and Jurassic evaporate and CO2. These materials have been used as
sorbents. To choose the adequate geological layers for sequestration and with minimum risk of
leakage, adsorbent characterizations were investigated using X-ray diffraction, SEM and surface
area analysis, structural and textural shapes of these materials have been investigated too. The
elution chromatography in gaseous phase has been employed to determine the adsorption isotherms
of adsorbed CO2 for each adsorbent. Then, the treatment of the experimental data allowed
us to compare each CO2/adsorbent couple. The adsorption isotherms were modeled using the
Langmir and Freundlich models. A thermodynamic comparison between the different adsorbents
will also be provided. Experimental results show that clay and Triassic sandstone have the highest
rate of adsorption amount. It has been also found that the Langmuir model is the most appropriate
one to describe the phenomenon of CO2 adsorption on clay. However, for the other adsorbents (i.e.
Triassic sandstone and Jurassic evaporates) the two-models are adequate.