HAL Id: hal-01818030
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Submitted on 18 Jun 2018
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Synthesis and carbonation of mesoporous magnesium oxide
Sondes Hamdi, Laetitia Vieille, Kais Nahdi, Loïc Favergeon
To cite this version:
Sondes Hamdi, Laetitia Vieille, Kais Nahdi, Loïc Favergeon. Synthesis and carbonation of mesoporous magnesium oxide. 49es journées de calorimétrie et d’analyse thermique - JCAT49, May 2018, Saint-Etienne, France. �hal-01818030�
Synthesis and carbonation of mesoporous
magnesium oxide
Sondes HAMDI
1, Laetitia VIEILLE
2, Kais NAHDI
1, Loïc FAVERGEON
21
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
Carbon capture and storage = key point to combat climate change
One way of CO2 capture = use of oxide as sorbents : CaO, MgO, Li2ZrO3, CaZrO3,…
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 CO2 sorbent :
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
MgO (s) + CO
2(g) → MgCO
3(s)
hydromagnesite
magnesium oxide
Sample BET surface area /m².g-1 Pore volume /cm3.g-1
MgO (from hydromagnesite
decomposition) 100 0.35
Hydromagnesite 23 0.068
Commercial MgO 9 0.048
Mg5(CO3)4(OH)2.4H2O => Mg5(CO3)4(OH)2=> 5MgO + 4 CO2 + 5H2O
ATG (Mettler-Toledo AG/DSC 1)
30°C, P(CO
2)=600 mbar
30°C, P(CO
2)=500mbar, P(H
20)=15mbar
(15 mbar H20)
FTIR – ATR (Bruker Vertex 70)
Need for water vapor to carbonate
Formation of MgCO3.3H20 at low temperature (30°C)
Grain shape seems preserved
Specific surface area decreases with carbonation
After 24h
S
BET= 10 m
2.g
-1Context
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 400 900 1400 1900 2400 2900 3400 3900 Ab sorban ce Wavenumber cm-1 ATR FTIRMgO before carbonation MgO- 15 min MgO-1h MgO- 18 h MgO-24 h 3300 1650 860 1420 1480 1098