CO_2 Capture onto Zeolite 13X and Zeolite 4A by Pressure Swing Adsorption in a Fixed Bed

摘要

Combustion of fossil fuels is one of the major sources of greenhouse gas like CO_2, it is therefore necessary to develop technologies that will allow us to utilize the fossil fuels while reducing the emissions of greenhouse gases. Pressure swing adsorption (PSA) is a potential technique for removing CO_2 from high-pressure fuel gas streams. Zeolites are suitable candidate sorbents for use in the PSA process. Studies of the gas adsorption of CO_2 onto zeolite 13X and zeolite 4A were conducted at a temperature of 25°C, 35°C, 45°C and 60°C up to a pressure of 1 bar. The data fitting is accomplished with the Toth and Sips adsorption models which are generally used for micro-porous adsorbents such as zeolites. Moreover, regeneration studies have been conducted in order to verify the possibility of adsorbents reutilization, to determine its CO_2 adsorption capacity within consecutive cycles of adsorption–desorption. Zeolite with higher surface area showed higher CO_2 adsorption capacity. There is no full reversibility for the two zeolites.