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A novel approach to prepare efficient CO2 sorbents derived from alumina-extracted residue of coal ash
Journal of Environmental Chemical Engineering ( IF 7.7 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.jece.2021.106373
Xiangyu Li 1, 2 , Zhiqing Wang 1 , Ru Feng 1, 2 , Jiejie Huang 1 , Yitian Fang 1
Affiliation  

If a large amount of fly ashes produced by coal-fired power plants was not treated harmlessly, it will pose a serious threat to the ecological environment. As one of the high-valued utilization technologies of fly ash, the technology of extracting aluminum from coal ash produces large quantities of waste residue after acid leaching nevertheless. It is an economic and environmentally friendly way to recycle alumina-extracted residue (AR) as solid sorbent to capture CO2. In this study, using AR as raw material, we synthesized PEI modified solid sorbents by novel “wet gel impregnation” method (WGI) to enhanced CO2 capture. The effects of amine loading, adsorption temperature, and impregnation method on CO2 adsorption capacity and kinetics were investigated by thermogravimetric analysis (TGA). On this basis, a possible double-layer adsorption model was proposed, i.e., the PEI adsorption layer on the outer surface of sorbents and the internal isolation layer. The ratio of the two layers changed with the variation in PEI loading and adsorption temperature, resulting in the difference of adsorption capacity. The maximum CO2 adsorption capacity of 2.07 mmol/g was obtained under the amine loading of 40 wt% at 95 °C, and 100% CO2. Moreover, the stable adsorption capacity and high CO2 selectivity were maintained in five repeated adsorption-desorption cycles.



中文翻译:

一种从煤灰氧化铝提取渣中制备高效 CO2 吸附剂的新方法

燃煤电厂产生的大量粉煤灰如果不进行无害化处理,将对生态环境构成严重威胁。粉煤灰提铝技术作为粉煤灰的高价值利用技术之一,酸浸后仍会产生大量废渣。回收氧化铝提取的残渣 (AR) 作为固体吸附剂以捕获 CO 2是一种经济且环保的方式。在本研究中,我们以 AR 为原料,通过新型“湿凝胶浸渍”方法 (WGI) 合成了 PEI 改性的固体吸附剂,以增强 CO 2捕获。胺负载量、吸附温度和浸渍方法对CO 2 的影响通过热重分析(TGA)研究吸附容量和动力学。在此基础上,提出了一种可能的双层吸附模型,即吸附剂外表面的PEI吸附层和内部隔离层。两层的比例随着PEI负载量和吸附温度的变化而变化,导致吸附容量的差异。在95℃、40wt%胺负载和100%CO 2下获得2.07 mmol/g的最大CO 2吸附容量。此外,在五个重复的吸附-解吸循环中保持稳定的吸附容量和高CO 2选择性。

更新日期:2021-09-24
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