Synthesis of Coal Fly Ash-based Zeolite X and Its Application for CO2 Capture and Separation
LI Kejia1, YIN Zhigang2, WANG Binbin3, LI Yao1,*
1 College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China 2 Rongsheng Alliance Guli New Energy Technology Co., Ltd., Beijing 100000, China 3 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
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.
李珂嘉, 殷志刚, 王彬彬, 李瑶. 粉煤灰基X型沸石的合成及在CO2捕集分离中的应用[J]. 材料导报, 2025, 39(24): 24120034-10.
LI Kejia, YIN Zhigang, WANG Binbin, LI Yao. Synthesis of Coal Fly Ash-based Zeolite X and Its Application for CO2 Capture and Separation. Materials Reports, 2025, 39(24): 24120034-10.
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2025, Vol. 39 
