关键词: 频率响应技术, Y型分子筛, 吸附扩散过程, 传质动力学

Abstract: The Y-type zeolites (REY ) with different contents of rare earth ions were prepared by the traditional liquid-phase ion exchange method. The mass transfer kinetics of benzene on the REY zeolite was studied by using frequency response (FR) technique and intelligent gravimetric analyzer (IGA). The effects of the concentration of rare earth ions on the adsorption and diffusion process were studied, and the samples were characterized by XRD, physical analyzer and other characterization methods. The results show that the adsorption capacity decreases with the introduction of rare earth, and the introduction of appropriate rare earth can improve its mass transfer performance, but excessive mass of rare earth decreases the mass transfer performance. The adsorption process of benzene on REY zeolite has different adsorption process. The introduction of rare earth can improve the selectivity of zeolite to adsorbate in the process of catalytic and adsorption separation, so as to improve the efficiency of catalysis and separation.

Key words: Frequency response technique, Y-type zeolites, Adsorption diffusion process, Mass transfer kinetics