Hydrogen bonding to oxygen in siloxane bonds drives liquid phase adsorption of primary alcohols in high-silica zeolites

Upon liquid phase adsorption of C(1)–C(5) 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: Brønsted acid and defect sites. Combining quantitative in situ(1)H MAS NMR, qualitativ...

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Detalles Bibliográficos
Autores principales: Radhakrishnan, Sambhu, Lejaegere, Charlotte, Duerinckx, Karel, Lo, Wei-Shang, Morais, Alysson F., Dom, Dirk, Chandran, C. Vinod, Hermans, Ive, Martens, Johan A., Breynaert, Eric
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Chemistry
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10463557/
https://www.ncbi.nlm.nih.gov/pubmed/37401863
http://dx.doi.org/10.1039/d3mh00888f
Descripción
Sumario:Upon liquid phase adsorption of C(1)–C(5) 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: Brønsted acid and defect sites. Combining quantitative in situ(1)H 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 Brønsted acid and defect sites and does not exclude cooperative effects from dispersive interactions.

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