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Preparation of polyethylenimine impregnated mesoporous precipitated silica for CO2 capture
Rayer, A. V., Quang, D. V., El Hadri, N., & Abu-Zahra, M. R. M. (2014). Preparation of polyethylenimine impregnated mesoporous precipitated silica for CO2 capture. In Advances in Gas Processing: Proceedings of the 4th International Gas Processing Symposium (pp. 21-37). Elsevier. https://doi.org/10.1016/C2013-0-19013-7
In this study, a novel and inexpensive CO2 adsorbent has been prepared by impregnating polyethyleneimine (PEI) onto mesoporous precipitated silica. The study indicates that the CO2 adsorption capacity of the prepared adsorbent increases with the increase in PEI loading. The maximum adsorption capacity of adsorbent can be achieved at 75 °C. In pure CO2, at 75 °C and 1 bar, adsorbent containing 60% PEI can adsorb 199.6 mg of CO2/g. The adsorption capacity of an adsorbent impregnated with 55% PEI (PEI-MPS-55) measured at the heat equilibrium reduced from 128 mg/g to 117 mg/g and 101 mg/g as CO2 concentration varies from 100 to 15% and 4%, respectively. The adsorption heat calculated ranges from 68–75 kJ/mole of CO2. The cyclic adsorption-desorption studies revealed that the adsorbent is relatively stable; the CO2 loading was not changed after 20 cycles of adsorption/regeneration at 75/90 °C.