Abstract
A series of isomorphously framework-substituted ZSM-5 zeolites has been characterized by Fourier transform infrared spectroscopy, with primary focus on the nu(OH) region, and by temperature programmed NH3 desorption. The protonic form of the zeolites exhibited two characteristic absorptions in the nu(OH) region: a band at 3740 cm assigned to terminal SiOH, and a band at lower frequency assigned to M(OH)Si (bridging hydroxyl), whose frequency depends on acid strength. Based on these techniques, the relative Bronsted acidity is found to increase according to SiOH < B(OH)Si << Fe(OH)Si < Ga (OH)Si < Al(OH)Si.
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