Bifunctional Materials for CO₂ Adsorption: Short Review

Abstract

In recent years, there has been growing interest in adsorbents with high surface area, high porosity, high stability and high selectivity for CO₂ adsorption. By the incorporation of the additive on the supports such as zeolite, silica, and carbon, the physicochemical properties of the adsorbent and CO₂ adsorption performance can be enhanced. In this review, we focus on the overview of bifunctional materials (BFMs) for CO₂ adsorption. The findings of this study suggests that the high surface area and high porosity of the support provide a good medium for high dispersion and accessibility of additives (amine or metal oxide), enhancing the CO₂ adsorption efficiency. The excessive additive however may lead to a decrease of CO₂ adsorption performance due to pore blockage and the decrease of active sites for CO₂ interactions. The synergistic relationship of the supporting material and additive is significant towards the enhancement of CO₂ adsorption.