Abstract
UL-ZSM-5 materials have been prepared by templated solid-state crystallization of zeolites starting from the amorphous mesostructured aluminosilicate Al-Meso. Microcalorimetry and FTIR have been employed to characterize their surface acidity. In good agreement with 27Al MAS NMR data, UL-ZSM-5 displayed an improved density and strength of Brönsted acid sites, as compared to Al-Meso, owing to the incorporation of aluminium in a tetrahedral environment similar to that of zeolite ZSM-5. Moreover, they showed an enhanced Brönsted/Lewis relative acid ratio. However, Al-Meso showed the highest concentration of strong Lewis acid sites due to its largest amount of aluminium in extraframework positions.
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Ungureanu, A., Thang, H.V., Trong On, D. et al. Acid properties of semicrystalline zeolitic mesoporous UL-ZSM-5 materials. J Therm Anal Calorim 87, 417–422 (2007). https://doi.org/10.1007/s10973-006-6891-0
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DOI: https://doi.org/10.1007/s10973-006-6891-0