The elevated temperature pressure swing adsorption (PSA) based on potassium promoted hydrotalcite-like compounds (K-HTlc) is one of the most promising technologies for pre-combustion CO2 capture. K-HTlc could achieve a fast part of reversible CO2 capacity under desorption conditions of low inert purge flow rate and short purge time. The CO2 breakthrough capacity is 1.01 mmol/g and 0.6 mmol/g at 1.2 MPa (CO2 partial pressure) for 400 oC and 300 oC, respectively. A one-dimensional isotherm column model was developed to describe the K-HTlc performance and CO2 transportation in a single column during PSA process. The results indicated that the simulation results agreed well with the experimental results. The CO2 desorption process of K-HTlc should be characterized as a fast and a followed slow process which is origin from the chemisorption characteristics and was validated by the model results. The presented model could be further applied in the practical industrial PSA.
Yang, Y., Shi, Y., Li, S., & Cai, N. (2014). Experimental characterization and mechanistic simulation of CO2 adsorption/desorption processes for potassium promoted hydrotalcites sorbent. In Energy Procedia (Vol. 63, pp. 2359–2366). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2014.11.257