**4. Conclusions**

Physical and chemical CO2 absorption are mature technologies that can be applied to CO2 emission mitigation at large scale, mainly focused on fossil-fuel power plants, cement production and steel manufacturing. This chapter summarizes the cutting-edge of the knowledge about absorbents developed for this proposal. The most relevant aspect of conventional physical and chemical solvents applied to CO2 capture was summarized and their physical properties, absorption mechanisms and kinetics were further discussed. Based on the current state-of-art in the field of CO<sup>2</sup> absorption, the novel solvents and blends were also reported and new applications such as ionic liquids have been deeply discussed along the manuscript from the specific literature available on this topic.

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