Abstract
Solid amine adsorbents show the excellent capture performance in flue gas CO2 separation. The pore structure of adsorbent plays a crucial role in improving adsorption performance. Herein, hierarchical mesoporous silica (HMS) support with large pore volume was prepared via one template without resorting to either additives or multi-templates. The pore structure of HMS support for polyethyleneimine (PEI) resulted in larger CO2 adsorption capacity and faster adsorption kinetics when compared to the SBA-15 support with the same amount of PEI loading. At the optimal PEI loading of 70 wt% on HMS, CO2 adsorption amount is 4.21 mmol/g at 75 °C with 15 vol% CO2. Simultaneously, HMS-PEI70% adsorbent is proved to be good stability during 20 adsorption cyclic. These results demonstrate that supports with hierarchical mesoporosity provide significant advantages for CO2 capture. Finally, considering the practical application of adsorbent, the influence of capture temperature and impurity gas on capture performance has been further investigated. CO2 adsorption capacity was enhanced with the presence of water, while the SO2 has the negative effect on the capture performance due to the competitive adsorption of sulfur dioxide. This work can provide a promising composite adsorbent to realize the efficient CO2 separation from the flue gas in the future.
Published Version
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