Epoxide-functionalization of polyethyleneimine for synthesis of stable carbon dioxide adsorbent in temperature swing adsorption.
Epoxide-functionalization of polyethyleneimine for synthesis of stable carbon dioxide adsorbent in temperature swing adsorption.
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DOI：
10.1038/ncomms12640
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发表时间：
2016-08-30
影响因子：
16.6
通讯作者：
Choi, Minkee
中科院分区：
文献类型：
--
作者：
Choi, Woosung;Min, Kyungmin;Kim, Chaehoon;Ko, Young Soo;Jeon, JaeWan;Seo, Hwimin;Park, Yong-Ki;Choi, Minkee
由于含胺吸附剂能够从湿烟气中化学吸收低浓度二氧化碳，因此对燃烧后二氧化碳捕获进行了广泛的研究。然而，早期的研究主要集中在吸附剂的二氧化碳吸收上，并没有证明在这种条件下吸附剂的有效再生和长期稳定性。在这里，我们报道了多功能和可扩展合成的功能化聚乙烯亚胺(PEI)/二氧化硅吸附剂，该吸附剂同时具有大的工作容量（2.2 mmol g−1）和在实际变温吸附过程中的长期稳定性（在120°C下100%二氧化碳下再生），能够分离浓二氧化碳。我们证明，与未经改性的PEI（76%）相比，1,2-环氧丁烷功能化PEI在再生过程中降低了吸附热，促进了二氧化碳的解吸（>99%）。此外，由于抑制尿素形成和氧化胺降解，功能化显著提高了吸附剂在反复变温吸附循环中的长期稳定性。二氧化碳捕获技术已被作为减轻二氧化碳排放的环境成本的一项战略而实施。在这里，作者合成了一种功能化聚乙烯亚胺/二氧化硅吸附剂，用于燃烧后的二氧化碳捕获，具有大的二氧化碳容量和长期稳定性。
Amine-containing adsorbents have been extensively investigated for post-combustion carbon dioxide capture due to their ability to chemisorb low-concentration carbon dioxide from a wet flue gas. However, earlier studies have focused primarily on the carbon dioxide uptake of adsorbents, and have not demonstrated effective adsorbent regeneration and long-term stability under such conditions. Here, we report the versatile and scalable synthesis of a functionalized-polyethyleneimine (PEI)/silica adsorbent which simultaneously exhibits a large working capacity (2.2 mmol g−1) and long-term stability in a practical temperature swing adsorption process (regeneration under 100% carbon dioxide at 120 °C), enabling the separation of concentrated carbon dioxide. We demonstrate that the functionalization of PEI with 1,2-epoxybutane reduces the heat of adsorption and facilitates carbon dioxide desorption (>99%) during regeneration compared with unmodified PEI (76%). Moreover, the functionalization significantly improves long-term adsorbent stability over repeated temperature swing adsorption cycles due to the suppression of urea formation and oxidative amine degradation. Carbon dioxide capture technologies have been implemented as a strategy to alleviate the environmental costs of CO2 emissions. Here, the authors synthesize a functionalized-polyethyleneimine/silica adsorbent for post-combustion CO2 capture that exhibits a large CO2 capacity and long-term stability.
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影响因子：
4.9
作者：
Choi, M;Heo, W;Ryoo, R
通讯作者：
Ryoo, R
影响因子：
4.2
作者：
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作者：
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作者：
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通讯作者：
Sayari, Abdelhamid
影响因子：
32.5
作者：
Lee, Woo Ram;Hwang, Sang Yeon;Hong, Chang Seop
通讯作者：
Hong, Chang Seop