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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
	Chen, Heijin; Yan, Feng; Jiao, Xianfeng; Wu, Hao; Liang, Xiaoyu; Shen, Xuehua; Fan, Hongzhao; Zhang, Zuotai
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
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/300146
作者单位	Southern University of Science & Technology
推荐引用方式 GB/T 7714	Chen, Heijin,Yan, Feng,Jiao, Xianfeng,et al. 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	Chen, Heijin.,Yan, Feng.,Jiao, Xianfeng.,Wu, Hao.,Liang, Xiaoyu.,...&Zhang, Zuotai.(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	Chen, Heijin,et al."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).