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| DOI | 10.1016/j.seppur.2024.127469 |
| Facile and efficient amine@AD-SiO2 adsorbents from coal fly ash: Comparison of various amines for CO2 adsorption capacity and cyclic stability | |
| 发表日期 | 2024 |
| ISSN | 1383-5866 |
| EISSN | 1873-3794 |
| 起始页码 | 346 |
| 卷号 | 346 |
| 英文摘要 | Solid amine adsorbent is recognized as an efficient CO2 capture route for globe climate change mitigation. The pore structure of nano supports generally plays a crucial role in the CO2 adsorption performance of solid amine adsorbents; however, the involving of costly and toxic pore-expanding agents limited their scalable application. Herein, an azeotropic-distillation nano-SiO2 (AD-SiO2) support was recycled from coal fly ash (CFA) using the CO2-assisted precipitation and n-butanol AD methods, and possessed a super pore volume of 2.52 cm(3)center dot g(-1) and an average pore size of 36.6 nm. After impregnating the triethyltetramine, tetraethylenepentamine, pentaethylenehexamine (PEHA), or polyethyleneimine, the synthesized amine@AD-SiO2 adsorbents achieved the excellent adsorption capacity of 3.50-6.13 mmol center dot g(-1) and the fast adsorption kinetics, owing to the superior pore structure of AD-SiO2 support. Based on the viscosity, TGA and liquid-NMR characterization, we explained that the large amine molecule would block the CO2 diffusion channel and thus restrict the active sites, while the small amine molecule would evaporate during the regeneration process. Inspiringly, the PEHA@AD-SiO2 adsorbent possessed the excellent cyclic stability with merely 0.18 % decay per cycle and achieved a final CO2 uptake of 4.24 mmol center dot g(-1) over 50 cycles. This study notably improved the long-term adsorption capacity of solid amine adsorbents via the pore-expanded AD-SiO2 support from CFA, thereby is a low-carbon technology for large-scale industrial CO2 capture. |
| 英文关键词 | Solid amine adsorbents; CO2 capture; Pore-expandednano-SiO2 supports; Azeotropic distillation; Coal fly ash; Various organic amines |
| 语种 | 英语 |
| WOS研究方向 | Engineering |
| WOS类目 | Engineering, Chemical |
| WOS记录号 | WOS:001231871000001 |
| 来源期刊 | SEPARATION AND PURIFICATION TECHNOLOGY
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/300145 |
| 作者单位 | Southern University of Science & Technology |
| 推荐引用方式 GB/T 7714 | . Facile and efficient amine@AD-SiO2 adsorbents from coal fly ash: Comparison of various amines for CO2 adsorption capacity and cyclic stability[J],2024,346. |
| APA | (2024).Facile and efficient amine@AD-SiO2 adsorbents from coal fly ash: Comparison of various amines for CO2 adsorption capacity and cyclic stability.SEPARATION AND PURIFICATION TECHNOLOGY,346. |
| MLA | "Facile and efficient amine@AD-SiO2 adsorbents from coal fly ash: Comparison of various amines for CO2 adsorption capacity and cyclic stability".SEPARATION AND PURIFICATION TECHNOLOGY 346(2024). |
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