Particulate and membrane molecular sieves prepared to adsorb carbon dioxide in packed and staggered adsorber

Abstract

A fixed-bed adsorption system was used to remove carbon dioxide in this study. Adsorption isotherms were obtained from a microbalance system and the characteristics of a molecular sieve affected by preparing variables were analyzed. The adsorbents, including a particulate molecular sieve and a molecular sieve membrane, were used to adsorb carbon dioxide in the fixed-bed adsorption system. Since the surface properties of the molecular sieve were affected by the preparation variables, particulate and membrane molecular sieves were synthesized to examine the effects of preparation variables on the adsorption of carbon dioxide. The experimental results showed that the pore size of the molecular sieve has increased with the chain length of quaternary ammonium salts and higher hydrothermal temperature. Adsorption isotherms for carbon dioxide adsorbed by particulate molecular sieve and molecular sieve membrane were favourable. In addition, the breakthrough curve for the lower inlet gas flow rate was closer to that of the particulate molecular sieve under the same amount of outlet fresh air. The results demonstrated that the adsorption system for the staggered alumina carriers coated with molecular sieve membranes is worthy of development.