Wang Xia, Zeng Wulan, Guo Qingjie, Geng Qijin, Yan Yongmei, Hu Xiude
Department of Chemistry and Chemical Engineering, Weifang University Weifang 261061 Shandong China
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University Yinchuan 750021 China.
RSC Adv. 2018 Oct 16;8(62):35521-35527. doi: 10.1039/c8ra07560c. eCollection 2018 Oct 15.
To systematically study CO adsorption performance, semicoke from the low-rank lignite was further activated and functionalized for CO capture from flue gases. The effect of the activation conditions, such as the activation temperature, activation time and HCl washing, and the tetraethylenepentamine (TEPA)-functionalization on CO adsorption were investigated; the pore structure and surface morphology of the semicoke under different activation conditions were characterized. Both the surface structure and adsorption performance of the activated semicoke could be improved under appropriate activation and acid-treatment conditions. The optimal breakthrough and equilibrium adsorption capacity for the TEPA-functionalized HCl-washed activated semicoke were separately 2.68 and 3.70 mmol g at 60 °C for the simulated flue gas of 15 vol% CO and 85 vol% N. After ten adsorption-desorption cycles, the equilibrium adsorption capacity was still 3.43 mmol g, and the semicoke-based sorbent showed good regenerability.
为了系统地研究CO吸附性能，对低阶褐煤半焦进行进一步活化和功能化处理，以用于从烟气中捕获CO。研究了活化温度、活化时间和HCl洗涤等活化条件以及四乙烯五胺（TEPA）功能化对CO吸附的影响；对不同活化条件下的半焦的孔结构和表面形态进行了表征。在适当的活化和酸处理条件下，活化半焦的表面结构和吸附性能均可得到改善。对于含15 vol% CO和85 vol% N的模拟烟气，在60°C下，TEPA功能化的HCl洗涤活化半焦的最佳穿透吸附容量和平衡吸附容量分别为2.68和3.70 mmol/g。经过十次吸附-解吸循环后，平衡吸附容量仍为3.43 mmol/g，基于半焦的吸附剂表现出良好的再生性能。
