Title: | Absorption of carbon dioxide in ionic liquids and their mixtures
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Author: | Pinto Castillo, Alicia María
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Advisor: | Arce Arce, Alberto
Soto Campos, Ana María
Rodríguez Martínez, Héctor
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Other Contributors: | Escola Técnica Superior de Enxeñaría. Departamento de Enxeñaría Química
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Subject: | Ionic liquids | carbon dioxide | chemisorptions | properties | |
Date of Issue: | 2014-03-19
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Abstract: | The potential application of some ionic liquids and of binary mixtures of them as
absorbents for CO2 has been investigated.
The CO2 absorption capacity of these solvents has been experimentally
determined in the low pressure range. Several mixtures of two CO2-physisorbing ionic
liquids, and of a CO2-physisorbing ionic liquid with a CO2-chemisorbing ionic liquid,
have been analysed. Although their absorption capacities generally lie within those of
the corresponding pure ionic liquids, different synergistic effects have been found.
These effects are accompanied by the tuning of thermal behaviour and physical
properties with variation of the composition of the mixtures. The results are
discussed in terms of the mechanisms of absorption and the influence of the structural
features of the ionic liquids. Suitable correlations of the experimental data for both
the CO2 absorption isotherms and the physical properties investigated (density,
viscosity, and surface tension) have been carried out.
In a further aspect, the CO2 absorption capacity of a highly viscous amino acid
ionic liquid has been substantially improved, along with its thermal stability, by
supporting it onto mesoporous silica. |
URI: | http://hdl.handle.net/10347/10018
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