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A novel blended amine functionalized porous silica adsorbent for carbon dioxide capture
Adsorption ( IF 3.3 ) Pub Date : 2020-04-28 , DOI: 10.1007/s10450-020-00238-z
Peiyu Zhao , Guojie Zhang , Lanxia Hao

In order to accomplish efficient CO2 capture, poly(ethyleneimine) (PEI) and tetraethylenepentamine (TEPA), with commonly used and inexpensive, was codispersed into the as-prepared SBA-15 (SBA-15(p)) to prepared blended amine functionalized adsorbent. The influence of the mass ratio of PEI to TEPA on the adsorption property was investigated. The promoting effects of TEPA on CO2 capture property were investigated. The adsorbents were characterized using N2 adsorption/desorption, Fourier transform infrared spectroscopy (FTIR), Transmission electron microscope (TEM) and in situ diffuse reflectance infrared fourier transform spectroscopy (in situ DRIFTS). Among the prepared adsorbents, the SBA-15(p) with 30 wt% PEI and 40 wt% TEPA has the CO2 capture capacity of 4.64 mmol/g and the optimal amine efficiency (0.359 molCO2/molN) at 75 °C with 20 vol% CO2 in N2. The addition of TEPA species could improve the CO2 adsorption amount with high amine utilization. The P123 with wheel-like distribution in SBA-15(p) promotes the CO2 capture by optimizing the accessibility of amine to the CO2. After 15 adsorption cycles, the SBA-15(p) with 40 wt% PEI and 30 wt% TEPA has better reusability and cyclic performance, the adsorption capacity can keep around 4.13 mmol/g. The result indicated that more PEI in the adsorbent would improve the adsorbent cyclic stability. Meanwhile, the in-situ DRIFTS results suggested that the reaction of CO2 molecule with the amine active sites in the adsorbent, agrees with anionic and cationic mechanisms.

中文翻译:

一种新型的混合胺官能化多孔二氧化硅吸附剂,用于二氧化碳捕集

为了完成有效的CO 2捕集,将常用且廉价的聚(亚乙基亚胺)(PEI)和四亚乙基五胺(TEPA)共分散在制备的SBA-15(SBA-15(p))中,以制备混合胺功能化吸附剂。研究了PEI与TEPA的质量比对吸附性能的影响。研究了TEPA对CO 2捕集性能的促进作用。使用N 2吸附/解吸,傅立叶变换红外光谱(FTIR),透射电子显微镜(TEM)和原位漫反射红外傅里叶变换光谱(原位DRIFTS)对吸附剂进行表征。在制备的吸附剂中,具有30 wt%PEI和40 wt%TEPA的SBA-15(p)具有CO 2在75°C和20%(体积)CO 2在N 2中的条件下,其捕获能力为4.64 mmol / g,最佳胺效率(0.359 molCO 2 / molN)。加入TEPA可以提高胺的利用率,提高CO 2的吸附量。SBA-15(p)中呈轮状分布的P123通过优化胺与CO 2的可及性来促进CO 2的捕获。经过15个吸附循环,具有40 wt%PEI和30 wt%TEPA的SBA-15(p)具有更好的可重复使用性和循环性能,吸附容量可保持在4.13 mmol / g左右。结果表明,吸附剂中更多的PEI将改善吸附剂的循环稳定性。同时,原位DRIFTS结果表明CO的反应在吸附剂中具有胺活性位的2个分子,与阴离子和阳离子机理一致。
更新日期:2020-04-28
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