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摘要
SBA-15(P) mesoporous material with 2D hexagonal was synthesized as the precursor, then a series of Amine-functionalization SBA-15(p)-xTEPA CO2 adsorbents were prepared by impregnating with TEPA. The adsorbents were characterized using BET, XRD, FTIR, TEM, TGA and In situ IR DRIFTs. Characterization results show that additional impregnated TEPA has a negative effect on the textural properties of adsorbents and additional impregnated TEPA has not change the channel structure of the adsorbent. It also is found that the synergistic effect of TEPA and P123 enhance the initial decomposition temperature and enhance the stability of adsorbent. Compared with SBA-15-60TEPA, SBA-15(p)-60TEPA (SP60T) has better reusability and cyclic performance. After 9 times cycle, the SP60T sorbent still adsorbs around 5.0 mmol/g of CO2 from 20% CO2 in N-2 at 75 degrees C and 1 atm, CO2 adsorption capacity only reduces 7.8%. It is mainly because that the template in carrier makes TEPA evenly dispersed, effectively prevent the TEPA reunion and loss, and improve the utilization ratio of amine. According to adsorption dynamics and inactivation model, CO2 adsorption of SP60T is mainly chemical adsorption. The in situ infrared spectroscopy reveals that CO2 adsorption of SP60T follows anionic and cationic mechanisms.
