Effects of Rare Earth Modifications on Structural Stability of HZSM-5 Zeolite

Abstract

HZSM-5 zeolite modified by rare earth was prepared with ion exchange method in the study. The effects of different types of rare earth elements, modification temperatures, pH, and rare earth contents on structural stability of the as-prepared zeolite were investigated. The as-prepared zeolite was characterized by XRD, SEM and FT-IR spectroscopy. The characterization results showed that the crystal structure of the zeolite was not changed by the modification of rare earth, which was evenly distributed on the surface or in the pore channel of zeolite. Sm/HZSM-5 zeolite with the highest structural stability was obtained under the following modification conditions: 2% rare earth Sm, modification temperature of 70 °C, 2 h of ion exchange, and pH 3.

Keywords:

• Rare earth modification
• ion exchange method
• HZSM-5
• structural stability

Additional information

Funding

This study was supported by the Science and Technology Department of Sichuan Province (2019ZDZX0025 and 2021JDTD0013), and the Everest Scientific Research Program (2020ZF11405), Sichuan Vanadium & Titanium Industry Development Research Center (2020VTCY-Z-01), Sichuan University Panzhihua school city strategic cooperation special fund project (2019CDPZH-6).