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A dual-column temperature/vacuum swing adsorption (TVSA) with zeolite 13X was built to study cyclic CO2 capture from a gas stream. The adsorption capacities and the physicochemical properties of 13X were preserved through 100 cycles of adsorption–desorption operation, displaying the stability of 13X for cyclic TVSA. The desorbed CO2 concentration could reach above 90%, which is practical for further utilization or permanent storage. The heat input required to regenerate spent 13X was low, reflecting an energy-efficient CO2 adsorbent. A statistical analysis on the adsorbent cost of CO2 capture revealed that the 13X could be cost-effective after extensive TVSA cycling. 13X showed less moisture sensitivity below 30 °C and showed a stable adsorption performance for CO2 under humid conditions. These results suggest that a dual-column TVSA with solid 13X is has the possibility to be a promising CO2 capture technology.
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Su et al. (2012) studied this question.
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