Wang Xia, Zeng Wulan, Zhang Hongyan, Li Dan, Tian Hongjing, Hu Xiude, Wu Qian, Xin Chunling, Cao Xiaoyu, Liu Wenjing
Department of Chemistry and Chemical Engineering, Weifang University Weifang 261061 Shandong China
College of Chemical Engineering, Qingdao University of Science & Technology Qingdao 266042 China.
RSC Adv. 2019 Aug 28;9(46):27050-27059. doi: 10.1039/c9ra05404a. eCollection 2019 Aug 23.
To reduce the cost of CO capture, polyethylene polyamine (PEPA), with a high amino density and relatively low price, was loaded into MCM-41 to prepare solid sorbents for CO capture from flue gases. In addition, methoxypolyethylene glycol (MPEG) was codispersed and coimpregnated with PEPA to prepare composite sorbents. The pore structures, surface functional groups, adsorption and regeneration properties for the sorbents were measured and characterized. When CO concentration is 15%, for 30, 40 and 50 wt% PEPA-loaded MCM-41, the equilibrium adsorption capacities were respectively determined to be 1.15, 1.47 and 1.66 mmol g at 60 °C; for 30 wt% PEPA and 20 wt% MPEG, 40 wt% PEPA and 10 wt% MPEG, and 50 wt% PEPA and 5 wt% MPEG codispersed MCM-41, the equilibrium adsorption capacities were respectively determined to be 1.97, 2.22 and 2.25 mmol g at 60 °C; the breakthrough and equilibrium adsorption capacities for 50 wt% PEPA and 5 wt% MPEG codispersed MCM-41 respectively reached 2.01 and 2.39 mmol g at 50 °C, all values showed a significant increase compared to PEPA-modified MCM-41. After 10 regenerations, the equilibrium adsorption capacity for codispersed MCM-41 was reduced by 5.0%, with the regeneration performance being better than that of PEPA-loaded MCM-41, which was reduced by 7.8%. The CO-TPD results indicated that the mutual interactions between PEPA and MPEG might change basic sites in MCM-41, thereby facilitating active site exposure and CO adsorption.
为降低二氧化碳捕集成本，将具有高氨基密度且价格相对较低的聚亚乙基多胺（PEPA）负载到MCM - 41中，制备用于从烟道气中捕集二氧化碳的固体吸附剂。此外，将甲氧基聚乙二醇（MPEG）与PEPA共分散并共浸渍以制备复合吸附剂。对吸附剂的孔结构、表面官能团、吸附和再生性能进行了测量和表征。当二氧化碳浓度为15%时，对于负载30%、40%和50% PEPA的MCM - 41，在60℃下平衡吸附容量分别测定为1.15、1.47和1.66 mmol/g；对于共分散30% PEPA和20% MPEG、40% PEPA和10% MPEG以及50% PEPA和5% MPEG的MCM - 41，在60℃下平衡吸附容量分别测定为1.97、2.22和2.25 mmol/g；对于共分散50% PEPA和5% MPEG的MCM - 41，在50℃下穿透和平衡吸附容量分别达到2.01和2.39 mmol/g，所有值与PEPA改性的MCM - 41相比均显著增加。经过10次再生后，共分散MCM - 41的平衡吸附容量降低了5.0%，再生性能优于负载PEPA的MCM - 41，后者降低了7.8%。二氧化碳程序升温脱附（CO - TPD）结果表明，PEPA与MPEG之间的相互作用可能会改变MCM - 41中的碱性位点，从而促进活性位点暴露和二氧化碳吸附。
