采用X射线粉末衍射、29Si固体核磁共振、X射线光电子能谱和扫描电镜及能谱等方法研究了La,Ce增强Y分子筛结构稳定性的差异.结果表明,La和Ce的引入均可稳定Y分子筛的骨架结构,但La离子比含量相当的Ce离子更容易进入分子筛内部和抑制骨架铝的脱除,因而对分子筛结构的稳定作用更优.结合量子力学密度泛函计算方法,从理论上阐述了这种增强机制,即La或Ce的引入能显著增加分子筛骨架Al和相邻O原子的作用力,有效稳定分子筛骨架Al位,并且稀土离子与分子筛间存在较强的作用力;与Ce相比,La与分子筛的相互作用更大,Al-O作用力更强,因此,La比Ce更有利于稳定分子筛的骨架结构.
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