Synthesis of LSX Using Seed-iteration Approach with High N2 Adsorption Capacity for Air Separation

doi:10.1007/s40242-024-4073-x

Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (6): 1192-1200.doi: 10.1007/s40242-024-4073-x

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Synthesis of LSX Using Seed-iteration Approach with High N₂ Adsorption Capacity for Air Separation

HUANG Yitong, WANG Yaquan, LIU Wenrong, BU Lingzhen, QU Liping, CHU Kailiang, GUO Niandong, ZHANG Xian, SU Xuemei, LI Yaoning, SANG Juncai

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China

Received:2024-03-24 Online:2024-12-01 Published:2024-10-26
Contact: WANG Yaquan,yqwang@tju.edu.cn E-mail:yqwang@tju.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (No. 21276183).

Abstract

Abstract: A series of low silica X zeolites (LSX) was synthesized through a seed-iteration approach, based on the seed addition strategy, and then loaded with lithium ions by an ion exchanging method to obtain high N₂ adsorption capacity. These zeolites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR), thermogravimetric analysis (TGA) and N₂ adsorption-desorption, and the adsorption capacity of N₂ and O₂ was evaluated by the vacuum pressure swing adsorption (VPSA) operation. The results showed that the nucleation period of the synthetic process could be effectively shortened by adding seed; as the seed iterations increased, the specific surface area and pore volume of the zeolites increased; the higher specific surface area and the pore volume, the higher the extent of the N₂ adsorption capacity, with the maximum reaching 28.05 cm³/g. However, there were no significant differences in the adsorbed capacity of O₂ by each sample. Therefore, the N₂/O₂ separation factor also increased gradually with iterations, with the maximum up to 6.61.

Key words: Seed-iteration, Low silica X zeolite (LSX), Air separation

HUANG Yitong, WANG Yaquan, LIU Wenrong, BU Lingzhen, QU Liping, CHU Kailiang, GUO Niandong, ZHANG Xian, SU Xuemei, LI Yaoning, SANG Juncai. Synthesis of LSX Using Seed-iteration Approach with High N₂ Adsorption Capacity for Air Separation[J]. Chemical Research in Chinese Universities, 2024, 40(6): 1192-1200.

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Synthesis of LSX Using Seed-iteration Approach with High N₂ Adsorption Capacity for Air Separation

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