Amine loaded K2CO3 for CO2 capture

https://doi.org/10.1016/j.ccst.2021.100011

“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.”