CO₂ Separation and Capture from Combustion Engine Exhaust Gas using Physical Adsorption Method

- Impacts of Surface Properties of Adsorbent and Regeneration Conditions on CO₂ Adsorption and Desorption Characteristics -

Abstract

CO₂ capture performance from engine exhaust using adsorption method was investigated. Zeolite 13X and NaY were used as adsorbents. When NaY is used, CO₂ capture performance was 34% lower than that of 13X. However, zeolite regeneration performance was improved 75% compared to use of 13X. This could be because lower CO₂ and water adsorption in low-pressure atmosphere, and desorption of water in a lower temperature range than those of 13X. These characteristics are due to the higher Si/Al ratio (Si/Al (13X) = 1.23, Si/Al (NaY) = 2.75). It was also demonstrated that when reducing humidity and removing pollutants from raw engine exhaust in the use of NaY, regeneration performance was farther improved.