Abstract
The aim of this work is to make a brief review of the adsorption of CO2 on modified clay minerals. Previous researchers have used different clay modifications, either by making changes in the structure by a reaction with another product or by the addition of a catalyst to improve their CO2 adsorption capacity. In order to obtain high values of CO2 uptake, some researchers have been incorporated amines-speices such as (3-aminopropyl)triethoxysilane (APTES), tetraethylenepentamine (TEPA) and a branched polyethylenimine (PEI) by grafting or impregnation. The synthesis of an adsorbent from mineral clays can generate an increase in its porosity and in its textural properties. These investigations differ in a number of factors such as the kind of clay, the operating conditions, y and the nature of the impregnated compound. The role of these factors in the CO2 adsorption capacity will be considered in detail in this review.
Highlights
In the last decades, intensive use of fossil fuels in industrial, transportation and building sectors lead to an increase of damaging emissions into the atmosphere
It has been reported that the CO2 capture and storage (CCS) is a sustainable strategy to mitigate the CO2 emissions in short- and mid- terms [2]
Most efforts are focused on the search and development of adsorbents with high adsorption capacity and selectivity for CO2 ; other parameters such as rapid adsorption/desorption kinetics, good mechanical properties, high hydrothermal and chemical stability, regeneration capacity, and synthesis costs are hardly taken into account in many studies to implement these adsorbents on a large scale [4,5,6,7,8]
Summary
Intensive use of fossil fuels in industrial, transportation and building sectors lead to an increase of damaging emissions into the atmosphere. Most efforts are focused on the search and development of adsorbents with high adsorption capacity and selectivity for CO2 ; other parameters such as rapid adsorption/desorption kinetics, good mechanical properties, high hydrothermal and chemical stability, regeneration capacity, and synthesis costs are hardly taken into account in many studies to implement these adsorbents on a large scale [4,5,6,7,8] Considering these premises, the scientific community is developing porous materials, which can adsorb selectively high levels of CO2. Clay minerals have become an alternative because of their excellent behavior in adsorption and catalysis [20] This factor together with their high availability and stability make them potential adsorbents to be used in CO2 capture processes. This manuscript evaluates the modification of clay minerals by incorporating amino groups, in order to increase the CO2 adsorption capacity and to enhance the chemical interaction between the absorbent and the molecules of CO2
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