AN IMPROVED ~1H NMR SPECTRA INTERPRETATION OF B AND Al ZEOLITES WITH DIPOLAR METHODS

摘要

Zeolite B Beta has been studied with ~1H and ~11B MAS NMR, and infrared spectroscopies. The data depend severely on the dehydration temperature, and their analysis yield an increasing degree of condensation of OH groups at higher temperatures. ~(11)B MAS NMR shows a considerable portion of BOH groups at low dehydration temperatures. 'H MAS NMR lines can be more securely assigned to sites near boron by using ~1H{~11B} rotational echo double resonance.