Study on the framework stability and surface acidity of HP zeolite by infrared spectroscopy

The framework stability and surface acidity of zeolite beta have been studied by infrared spectroscopy, The results show that the framework stability:and surface acidity of H beta zeolite depend on the experimental condition of template removal from the parent beta zeolite. With thermal decomposition in vacuum at 450 degrees C and 550 degrees C, the IR spectrum of H beta exhibited exclusively two intense bands (3610 cm(-1) and 3740 cm(-1)) showing relatively ideal of its framework and high Bronsted acidity. If the template was burned off in air at 550 degrees C, the 3610 cm(-1) band of H beta diminished considerably and two new IR bands (3780 cm(-1) and 3670 cm(-1)) appeared, indicating the obvious framework dealumination. The later H beta showed high Lewis acidity.Chemistry, PhysicalSCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)3121092-10971