【摘要】 用SiCl₄（气）高温处理HY制得一系列USY（T）,以USY（T）的晶胞常数α₀对其单位晶胞中铝原子的数目作图,发现c₀在24.45～24.55有一断落区间。由实验结果推导出两个以晶胞常数计算USY骨架硅铝比的公式。用400～1500cm^-1范围的红外光谱研究了USY的骨架变化。一些骨架振动特征频率与晶胞常数,单位晶胞中铝原子分数的相关图,也都出现断落区间。当晶胞常数小于24.41时,460cm^-1及1145cm^-1的两个峰发生劈裂。随晶胞常数的减少光谱峰变窄。更多还原

【Abstract】 X-ray powder diffraction has been applied to study ultrastable fau-jasites prepared by treating HY with SiCl4 at high temperature. A plot of the crystal lattice paramer of USY against the number of Al atoms per unit cell shows distinct break at crystal lattice parameter near 24.45 to 24.55. Two equations have been got to calculate the SiO2/Al2O3 ratio of USY framework from crystal lattice parameters.The infrared spectrum in the region 400 to 1500cm-1 is a sensitive tool indicating structural features of zeolite frameworks. The plots of several frequencies against -crystal lattice parameters and atoms fraction of Al also show distinct breaks. When a crystal lattice parameter is small than 24.41, bands are split about 460 and 1145cm-1. The peaks tend to be sharp with decrease in crystal lattice parameter.更多还原