A review on removal CO2, SO2, and H2S from flue gases using zeolite based adsorbents

Abstract

Abstract This review was carried out on removal of flue gases (CO 2 , SO 2 , and H 2 S) that are emitted from various sources. Burning solid fuels for heat, such as natural gas, gasoline, and coal or biomass, results in the production of flue gas. Adsorption of flue gases by utilizing Zeolites was properly explained, including the zeolite synthesis technique, characteristics, zeolite sensitivity, variables that influence the adsorption process, zeolite efficiency, and cost-effectiveness. Zeolites have a notable adsorption capability for CO 2 , SO 2 , and H 2 S, despite their major disadvantage of being poor long-term durability and stability. Remarkable advancements are being made in present-day CO 2 capture methods, especially concerning the use of zeolites. Zeolites are unique materials with great potential for CO 2 collection because of their tiny holes, high porosity, structural variety, and recyclability. Since atmospheric CO 2 concentrations are already more than 415 parts per million, it is imperative to limit future releases of this gas and keep it out of the carbon cycle. The elimination of SO 2 by the majority of zeolites was shown to rise with temperatures up to 200 °C and subsequently decrease at higher temperatures. It was also shown that SO 2 uptake and breakthrough time are significantly affected by drying zeolite using microwave and traditional heating methods. The sorption capacity and sorbent regenerability of SO 2 are sensitive to the presence of other gases in the flue gas, such as O 2 , CO 2 , NOx, and water vapor, as well as the reaction temperature. Zeolites must possess strong sulfur loading capacity, good regenerability, and a stable structure to be an effective adsorbent for the removal of H 2 S. Regarding the utilization of zeolites as adsorbents for the flue gases, new developments, and continuing difficulties have been concluded in this review work.