Abstract
Sn-MFI zeolite is one kind of remarkable emerging solid Lewis acid catalyst with high stability in recent years, due to its wide application in the environmental-friendly biomass conversion and catalytic oxidation processes. Herein, it is confirmed that the Sn species are highly dispersed in the matrix of zeolite, and the expansion of unit cell is attributed to the formation of crystalline SnOSi bonds, owing to the size difference between Si and Sn atoms. Due to the charge difference, Sn-MFI zeolites possess much more Lewis acid sites than Silicalite-1 and SnO2/Silicalite-1, and the catalytic property is closely related to the amount of Lewis acid sites. Consequently, it is reasonable to infer that the Sn atoms are inserted into the framework of Sn-MFI zeolite, in tetrahedral coordination, which acts as the active sites in Lewis acid catalyzed reactions.
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