6-1-3　Study of CO separation method from CO₂ discharge decomposition gas

Abstract

In order to build a decarbonized society, there is a need to establish a CCU technology that can convert separated and recovered CO₂ into valuable resources. We are developing a CCU process that combines three processes (CO₂ discharge decomposition using atmospheric pressure plasma, CO gas separation, and synthetic fuel and urea production using CO+NH3). In this study, we attempted to investigate a method to selectively separate CO from the CO₂/CO/O₂ gas mixture produced by the CO₂ discharge decomposition process. We tested the separation of CO₂, O₂, and N₂ (alternative CO) using a ceramic membrane separator, focusing on the difference in dynamic molecular diameters of the gas molecules. As a result, a high N₂ (alternative CO) separation performance of 99.5% was confirmed, indicating that the ceramic membrane separator can be used to selectively separate CO from a CO₂/CO/O₂ gas mixture.