Abstract
FTIR and NMR spectroscopy have been applied to quantification of Brønsted acid sites in various mordenite samples. A standardised deconvolution procedure has been developed for reliable decomposition of the complex hydroxyl region in the infrared spectra of mordenites into high frequency and low frequency peaks, and the peak extinction coefficients have been determined. As a result, the overall number of Brønsted acid sites, their distribution between main channels and side pockets, and the amount of extraframework aluminium can be determined. Results obtained by both FTIR and NMR are in good agreement and support each other. For instance, it is shown that for fully exchanged H-MOR, the distribution of Brønsted hydroxyls between main channels and side pockets is approximately 2:1. On partial ion exchange Na-MOR→HNa-MOR, protons are first introduced into main channel sites, with Na remaining in the side pockets.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
