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Amine-modified SBA-15(P): A promising adsorbent for CO2 capture
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2017-12-11 , DOI: 10.1016/j.jcou.2017.12.006
Guojie Zhang , Peiyu Zhao , Lanxia Hao , Ying Xu

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 N2 at 75 °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.



中文翻译:

胺改性的SBA-15(P):一种用于CO 2捕集的有前途的吸附剂

合成了具有二维六边形的SBA-15(P)介孔材料作为前驱体,然后用TEPA浸渍制备了一系列胺官能化的SBA-15(p)-xTEPA CO 2吸附剂。使用BET,XRD,FTIR,TEM,TGA和原位表征吸附剂红外漂移。表征结果表明,另外的浸渍的TEPA对吸附剂的质构性质具有负面影响,另外的浸渍的TEPA没有改变吸附剂的通道结构。还发现TEPA和P123的协同作用提高了初始分解温度并增强了吸附剂的稳定性。与SBA-15-60TEPA相比,SBA-15(p)-60TEPA(SP60T)具有更好的可重用性和循环性能。经过9次循环后,SP60T吸附剂仍在75°C和1个大气压CO 2下从N 2中的20%CO 2吸附约5.0 mmol / g CO 2。吸附量仅降低7.8%。主要原因是载体中的模板使TEPA均匀分散,有效防止TEPA团聚和损失,提高了胺的利用率。根据吸附动力学和失活模型,SP60T的CO 2吸附主要是化学吸附。在原位红外光谱表明,CO 2 SP60T的吸附如下阴离子和阳离子的机制。

更新日期:2017-12-11
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