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本文研究了Fe-Si、Sn-Si杂原子沸石分子筛的结构。以及Fe(Ⅲ)、Sn(Ⅳ)分别在沸石晶体中的状态和位置。沸石的红外吸收光谱和晶胞常数的测定,表明这两种沸石均具有ZSM-5型沸石的结构;顺磁共振和穆斯堡尔谱的研究表明一部分Fe(Ⅲ)和Sn(Ⅳ)分别参入了沸石骨架的构成,并以四面体状态存在于沸石的骨架网络中。在结构研究的基础上,对两种杂原子沸石的吸附性能、比表面积、热稳定性以及沸石的表面酸性进行了研究。
In this paper, the structure of Fe-Si, Sn-Si heteroatom zeolites has been studied. As well as the state and position of Fe (Ⅲ) and Sn (Ⅳ) in the zeolite crystal, respectively. The results of paramagnetic resonance and Mossbauer spectroscopy indicate that some of Fe (Ⅲ) and Sn (Ⅳ) respectively have the structure of ZSM-5 zeolite. It participates in the constitution of the zeolite framework and exists as a tetrahedron in the framework network of the zeolite. Based on the structural studies, the adsorption properties, specific surface area, thermal stability and zeolite surface acidity of two kinds of heteroatom zeolites were studied.