Hydrogen bonding to oxygen in siloxane bonds drives liquid phase adsorption of primary alcohols in high-silica zeolites?
Materials Horizons Pub Date: 2023-06-27 DOI: 10.1039/D3MH00888F
Abstract
Upon liquid phase adsorption of C1–C5 primary alcohols on high silica MFI zeolites (Si/Al = 11.5–140), the concentration of adsorbed molecules largely exceeds the concentration of traditional adsorption sites: Br?nsted acid and defect sites. Combining quantitative in situ1H MAS NMR, qualitative multinuclear NMR and IR spectroscopy, hydrogen bonding of the alcohol function to oxygen atoms of the zeolite siloxane bridges (Si–O–Si) was shown to drive the additional adsorption. This mechanism co-exists with chemi- and physi-sorption on Br?nsted acid and defect sites and does not exclude cooperative effects from dispersive interactions.
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Journal Name：Materials Horizons
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CAS no.: 89640-58-4
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