粉煤灰基X型沸石的合成及在CO<sub>2</sub>捕集分离中的应用

doi:10.11896/cldb.24120034

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Abstract To slow down the increasing trend of global CO₂ emissions, improve the utilization of low-quality natural gas, and reduce the negative impact of coal fly ash (CFA) on the environment, this work proposed to use fly ash as raw material to synthesize zeolite, and use the CFA-based zeolite as an adsorbent for CO₂ capture and separation. Zeolite X was prepared by alkali-melting assisted hydrothermal method. The results show that the type and purity of zeolite X were greatly affected by the synthesis conditions and parameters, among which zeolite A is the main competitive phase. This work successfully synthesized octahedral zeolite X (SXZ) under the hydrothermal condition of 90 ℃ and 12 h, which showed specific surface area of 589 m²/g, crystallinity of 87.11%, and good thermal stability. The adsorption capacity of as-synthesized zeolite X on CO₂ can reach 97% of that of commercial zeolite X (CXZ) and the gas separation selectivity of CO₂/N₂ and CO₂/CH₄ is higher than that of commercial X zeolites. This study provides an effective solution for environmental governance, energy utilization and high value-added utilization of solid waste.

Key words： coal fly ash zeolite X CO₂ adsorption gas separation

Published: 25 December 2025 Online: 2025-12-17

CLC number:

TE991

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	LI Kejia
	YIN Zhigang
	WANG Binbin
	LI Yao

Cite this article:

LI Kejia,YIN Zhigang,WANG Binbin, et al. Synthesis of Coal Fly Ash-based Zeolite X and Its Application for CO₂ Capture and Separation[J]. Materials Reports, 2025, 39(24): 24120034-10.

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https://www.mater-rep.com/EN/10.11896/cldb.24120034 OR https://www.mater-rep.com/EN/Y2025/V39/I24/24120034

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