Experimental Investigation and Modeling of Adsorption of Carbon Dioxide on 5A Molecular Sieve for Helium Purification of High-temperature Gas-cooled Reactor

The adsorption capability of carbon dioxide on 5A molecular sieve (5AMS) was investigated in a fixed-bed apparatus with two-road gas mixing system by dynamic column breakthrough method with helium as the carrier gas for helium purification system of high-temperature gas-cooled reactor(HTGR). Experiments were performed at temperatures of 5 °C∼35 °C and low carbon dioxide partial pressure range of 10∼150 Pa. The carbon dioxide isotherms on 5AMS were well fitted by Dubinin-Radushkevich model and Toth model, and the isosteric heat was determined. Based on mass- transfer zone model, the experimental breakthrough curves for different operating conditions were analyzed.