Sondes Hamdi

Laetitia Vieille

Kais Nahdi

Loïc Favergeon

Synthesis and carbonation of mesoporous magnesium oxide

Synthesis and carbonation of mesoporous magnesium oxide

Sondes HAMDI 1 , Laetitia VIEILLE 2 , Kais NAHDI 1 , Loïc FAVERGEON 2  Few study at atmospheric pressure

Synthesis and characterization of MgO

Thermal decomposition of hydromagnesite 3h at 300°C then 3h at 600°C under Ar

Carbonation of mesoporous MgO



  Carbon capture and storage = key point to combat climate change  One way of CO 2 capture = use of oxide as sorbents : CaO, MgO, Li 2 ZrO 3 , CaZrO 3 ,…  CaO and MgO = most attractive since carbonate are stable in storage condition and oxides are low-cost materials.  CaO presents some drawbacks such as its loss of carbonation capacity along cycling Interest to study MgO as a CO 2 sorbent :

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  CO 3 ) 4 (OH) 2 .4H 2 O => Mg 5 (CO 3 ) 4 (OH) 2 => 5MgO + 4 CO 2 + 5H 2 O Need for water vapor to carbonate  Formation of MgCO 3 .3H 2 0 at low temperature (30°C)  Grain shape seems preserved  Specific surface area decreases with carbonation

1

  Laboratoire d'Application de la Chimie Aux Ressources et Substances Naturelles et à l'Environnement, Université de Carthage, Faculté des Sciences de Bizerte, 7021 Zarzouna, Bizerte, Tunisia 2 Mines Saint-Etienne, Univ. Lyon, CNRS, UMR5307 LGF, Centre SPIN, F-42023 Saint-Etienne, France