Table 5.

Comparison between chemisorption and physisorption.

	Chemisorption	Physisorption
Description	Chemical reaction occurs between the solid sorbents and CO2	Depends on the physical properties of CO2 and the ability to engage in noncovalent interactions with the solid sorbent
Chemical Bonding	Covalent Bonding-Occur between functional groups and CO2 in the surface	Week Vander-walls forces-London and Dispersion forces, Occur inside pore walls
Advantages	High selectivity	Low recycling energy requirements High working capacity High selectivity even in wet environments Fast
Disadvantages	High energy required for recycling and the breakage of the chemical bonds Slow reactivity	Poor selectivity in binary or mixed gas applications
References	[55,56]	[25,57,58]