Synthesis of LSX Using Seed-iteration Approach with High N_(2) Adsorption Capacity for Air Separation  

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

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,P.R.China

出　　处：《Chemical Research in Chinese Universities》2024年第6期1192-1200,共9页高等学校化学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21276183)。

摘　　要：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 N_(2) adsorption capacity.These zeolites were characterized by X-ray diffraction (XRD);scanning electron microscopy (SEM);Fourier transform infrared spectra (FTIR);thermogravimetric analysis (TGA);N_(2) adsorption-desorption,and the adsorption capacity of N2 and O_(2) 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 cm^(3)/g.However,there were no significant differences in the adsorbed capacity of O_(2) by each sample.Therefore,the N2/O_(2) separation factor also increased gradually with iterations,with the maximum up to 6.61.

关 键 词：Seed-iteration Low silica X zeolite(LSX) Air separation 

分 类 号：O64[理学—物理化学]