Zeolite catalyst-aided tri-solvent blend amine regeneration: An alternative pathway to reduce the energy consumption in amine-based CO2 capture process
Zeolite catalyst-aided tri-solvent blend amine regeneration: An alternative pathway to reduce the energy consumption in amine-based CO2 capture process
复制标题
沸石催化剂辅助三溶剂混合胺再生：减少胺基二氧化碳捕集过程能耗的替代途径
DOI：
10.1016/j.apenergy.2019.02.089
复制
发表时间：
2019
期刊：
影响因子：
11.2
通讯作者：
Tontiwachwuthikul Paitoon
中科院分区：
文献类型：
--
作者：
Zhang Xiaowen;Huang Yufei;Gao Hongxia;Luo Xiao;Liang Zhiwu;Tontiwachwuthikul Paitoon
含CO2溶液再生过程中的能量损失是胺法CO2捕集技术在工业应用中面临的最大挑战之一。在此，为了降低能量需求，在98 °C下研究了富5 M单乙醇胺（MEA）和3 M MEA-2.5 M N-甲基-二乙醇胺（MDEA）-0.5 M哌嗪（PZ）三溶剂共混胺（三共混物）与四种不同固体酸催化剂（H-丝光沸石、Hβ、HZSM-5和Al 2 O3）的再生行为。对于无催化剂的测试，结果显示，与5 M MEA相比，三重共混物极大地增强了CO2解吸动力学并降低了相对能耗。根据13 C NMR的结果，多个质子转移路径和丰富的碳酸氢根离子的三元共混物有助于提高再生性能。此外，催化剂的使用进一步提高了三元共混物的CO2脱附活性。Hβ与三元共混物的组合具有最佳的再生性能，与MEA的空白运行相比，脱附性能提高了1360.8%，相对能耗降低了66.1%。此外，还提出了三元共混物中固体酸催化剂对溶剂再生的催化机理。Hβ的上级催化性能是由于其具有较大的介孔比表面积、较多的Br nsted酸中心和显著的总酸中心。此外，Hβ具有良好的稳定性，对CO2吸收活性无不良影响。本文的结果表明，三元混合胺与高效催化剂的组合是极大地降低基于胺的CO2捕集过程的能耗的特殊策略，最终使该技术在技术上和经济上更加可行。
The extensive energy penalty of CO2-loaded solution regeneration is one of the most crucial challenges facing industrial application of amine-based CO2capture technology. Here, to decrease the energy requirement, the regeneration behaviors of the rich 5 M monoethanolamine (MEA) and 3 M MEA-2.5 M N-methyl-diethanolamine (MDEA)−0.5 M piperazine (PZ) tri-solvent blended amines (tri-blend) with four different solid acid catalysts (H-mordenite, Hβ, HZSM-5 and Al2O3) were studied at 98 °C. For the catalyst-free tests, the results revealed that the tri-blend hugely enhanced the CO2desorption kinetics and reduced the relative energy consumption compared to 5 M MEA. Based on the results of13C NMR, the multiple proton transfer paths and abundant bicarbonate ions in the tri-blend contribute to the improved regeneration performance. Additionally, the use of catalyst further improved the CO2desorption activity of the tri-blend. The combination of Hβ and tri-blend presented the best regeneration performance, increasing the desorption performance by 1360.8%, and reducing the relative energy requirement by 66.1% compared with the blank run of MEA. In addition, a plausible catalytic mechanism of solvent regeneration over the solid acid catalyst in the tri-blend was suggested. The superior catalytic performance of Hβ resulted from the large mesoporous surface area, larger number of Brϕnsted acid sites and prominent total acid sites. Furthermore, Hβ displayed excellent stability and had no adverse influence on the CO2absorption activity. Results herein manifest that the combination of tri-blend amines with high-efficiency catalyst is exceptional strategy for tremendously decreasing the energy consumption of amine-based CO2capture processes, ultimately making this technology more technically and economically feasible.