A simple and controllable preparation of double salt Na2MgCO3 as an efficient CO2 absorbent
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摘要: 以羧甲基纤维素钠作为晶形导向剂，通过简单的物料混合法制备了一系列形貌可控的钠镁复盐CO2吸收材料，并采用XRD、SEM、TG进行表征，同时利用静态吸收和变温动态吸收-解吸循环实验方法研究了其CO2吸收性能和循环使用稳定性。均一的层状钠镁复盐吸收剂在添加0.3 g羧甲基纤维素钠时可得到，其饱和吸收量为22.8%（质量分数）；同时经过20次瞬时变温动态吸收-解吸循环实验后CO2吸收量可以达到并保持9.7%（质量分数），显示了良好的循环稳定性。Abstract: A series of sodium-magnesium double-salt as CO2 absorption materials with controllable morphologies were prepared by simple mixing method using sodium carboxymethyl cellulose as morphology-directing agent, and then characterized by XRD, SEM and TG. Finally, their CO2 absorption capability was evaluated by both saturation absorption tests at fixed temperature and dynamic absorption-desorption cyclic experiments. A uniform nanosheet-assembled absorbent, with 0.3 g sodium carboxymethyl cellulose added during preparation, can be obtained with a saturated absorption capacity of 22.8%. Meanwhile, good recycling capacity has been maintained at about 9.7% without apparent changes even after 20 cycles of dynamic absorption-desorption experiment.
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图 1 不同吸收剂的XRD谱图
Figure 1 XRD patterns of four different absorbents
a: blank; b: CMC-Na-0.1; c: CMC-Na-0.3; d: CMC-Na-0.6
图 2 四种吸收剂的SEM照片
Figure 2 SEM images of four absorbents
(a): blank; (b): CMC-Na-0.1; (c): CMC-Na-0.3; (d): CMC-Na-0.6
图 3 加入乙醇后样品(EtOH-eitelite)的SEM照片(e)和XRD谱图(f)
Figure 3 SEM image (e) and XRD pattern(f) of EtOH-eitelite after addition of ethanol
图 4 四种样品的DTA曲线
Figure 4 DTA curves of four sorbent samples
a: blank; b: CMC-Na-0.1; c: CMC-Na-0.3; d: CMC-Na-0.6
图 5 四种样品的CO2吸收
Figure 5 CO2absorption (305 ℃, 1 h)-desorption (450 ℃) curves of four samples
图 6 样品CMC-Na-0.3瞬时变温动态吸收-解吸循环结果(20次)
Figure 6 Instantaneous temperature swing dynamic cyclic absorption -desorption of CMC-Na-0.3 (20cycles)
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