Analysis of Al site in the framework of zeolites and catalytic activity of corresponding H+ and Fen+ sites

Abstract:
The aim of the present project is to develop H-ZSM-5 and Fe-ZSM-5 catalysts with low concentration of aluminium with isolated Al sites for (i) selective cracking of olefins to ethene and propene and (ii) selective oxidation of ethane with N2O. The low concentration of framework Al and its distribution is expected to be decisive for the activity of these catalysts in the above reactions. The variation of the source of aluminium and silicon will be used for synthesis of ZSM-5 zeolites with Si/Al 40 - 200. The novel multi-technique approach involving low temperature FTIR and 2D 27Al 3Q MAS NMR spectroscopy will be applied to analyse Al siting in the framework of ZSM-5 zeolites. Various locations of H-sites are expected to contribute to a different extent to demanded ß-scission, and to oligomerization and hydride transfer reactions of olefins leading to by-products.