Citation: Kui ZHANG, Huai Bin ZHANG, Shou He XIANG, Shang Yuan LIU, He Xuan LI, Fei HE. Selective Dealumination of ZSM-5 by Hydrothermal Treatment[J]. Chinese Chemical Letters, ;1998, 9(4): 397-400. shu

Selective Dealumination of ZSM-5 by Hydrothermal Treatment

a Catalysis Laboratory, Chemistry Department, Nankai University, Tianin 300071;
b State Key Laboratory of C Chemistry, Tianjin University, Tianjin 300072

Received Date: 15 August 1997

Fund Project: This work was supported by the key project of the National Natural Science Foundation of China, Grant No. 29133071

We studied the factors affecting the framework aluminium distribution in the ZSM-5 structure by hydrothermal treatment under different conditions. ²⁷A1MASNMR, XPS and chemical analysis revealed that with steaming at lower water vapor pressure, the framework aluminium located at the external surface is less stable. Steaming at higher water vapor pressure is beneficial in removing the framework A1 in HZSM-5, and especially helpful in removing that located at the internal surface of HZSM-5. By changing steaming conditions, one may control the framework aluminium distribution in the HZSM-5 structure.
- selective dealumination,
- water vapor pressure,
- steaming,
- HZSM
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