Pure silica CHA type zeolite for CO2 separation using pressure swing adsorption at high pressure

Abstract

Pure silica CHA type zeolite (Si-CHA) was used in a high pressure swing adsorption for CO₂ separation in the presence of water. The effective CO₂ adsorption capacity was much higher than that of zeolite 13X, and was not influenced by coexisting water. The breakthrough curve gave an effective CO₂ adsorption capacity of 3.1 mol kg⁻¹ and CO₂–N₂ selectivity of >31.