Abstract
Amine-impregnated adsorbents have promising application for selective CO2 capture from dilute sources in the industry. It is of great significance to develop a support exhibiting not only large pore width but also high pore volume, that can be prepared from renewable and low-cost raw materials. In this work, a mesoporous carbon exhibiting the total pore volume of 3.04 cm3/g was prepared from chitosan by a hard-template route. The mesoporous carbon was then physically impregnated with pentaethylenehexamine, which is rich in amine density and of extremely low volatility. It is demonstrated that the adsorption capacities for CO2 and selectivities for CO2/N2 on mesoporous carbon are significantly improved after the amine impregnation. The highest CO2 uptake of 3.72 mmol/g at 100 °C under atmospheric pressure was achieved in amine-impregnated carbons, being higher than most of other amine-impregnated adsorbents that have ever been reported in the literature. Furthermore, the CO2 adsorbed by amine-impregnated carbon can be facilely stripped out by concentration swing at 75 °C, and the amine-impregnated carbon exhibit high stability throughout consecutive adsorption-desorption cycles.
Published Version
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