Amine loaded K2CO3 for CO2 capture

“Potassium-based adsorbents own the merits of low cost and high availability in scale-up application, while their carbonation capacities and kinetics need further improvements. Meanwhile, organic amine-based adsorbents possess high CO2 storage capacities and relatively faster kinetics, but they also face the challenges of amine loss and degradation in repeated cycles (Gouedard et al., 2012). Given that, Wu et al. designed a composite CO2 adsorbent by combining organic amine and K2CO3 compound. The two components in the composite adsorbent exhibited synergistic effect in carbonation process to achieve an enhanced carbonation capacity of 2.8 mmol CO2/g (Wu et al., 2015). Guo et al. modified the K2CO3/AC adsorbent with polyethyleneimine (PEI) via the multi-step impregnation method. The PEI-K2CO3/AC adsorbent featured unique morphological characteristics. Most of PEI had been incorporated into the pore channels of the AC support, and most of K2CO3 crystals had been coated on the surface of AC, which covered the polyamines and protected them from being evaporated and degraded (Fig. 6). This endowed the PEI-K2CO3/AC adsorbent with good thermal stability and preferable CO2 capture capacity (3.60 mmol CO2/g) in repeated cycles (Guo et al., 2014).”


Fig. 6. Novel PEI-K2CO3/AC adsorbent with uniformed dispersion of active components for enhanced and stabilized CO2 capture capacity. Reproduced with permission from (Guo et al., 2014). Copyright 2014 Elsevier B. V.”

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