Boron sites in borosilicate zeolites at various stages of hydration studied by solid state NMR spectroscopy

Article Abstract:

The local structures of framework boron atoms in borosilicate zeolites B-beta, B-SSZ-33 and B-SSZ-42 are studied in the course of hydration/dehydration by employing solid-state NMR methods. (super 11)B MAS NMR spectra showed that boron trigonally coordinated to the framework (B(OSi)3, denoted as B[3]) can be readily transformed to a defective trigonal boron site (B(OSi)2(OH), denoted as B[3]-I) as a result of hydration.

Boron & Compounds, Usage, Nuclear magnetic resonance spectroscopy, Boron compounds

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Studies on the role of fluoride ion vs reaction concentration in zeolite synthesis

Article Abstract:

A study of effect of reaction time and the H2O/SiO2 reactant ratio is presented. It concludes that the low H2O/SiO2 reactant ratios lead to more open framework host structures and there is typically a higher uptake of organo-cation and fluorine.

Fluorine compounds, Atomic properties

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