Abstract
A method for the decomposition/deconvolution of the OH region of the infrared spectrum of US-Y is proposed. It is based on the stepwise thermodesorption of ammonia combined with FTIR. The analysis shows that the complex IR band from BrOnsted acid sites in US-Y can be deconstructed into acidic and nonacidic parts. The acidic part, in its turn, consists of four overlapping bands. These correspond to the conventional OH groups in siliceous zeolite Y (at 3621 and 3554 cm -1 ) and to hydroxyls associated with enhanced acidity, which has been attributed to the interaction of extraframework aluminum species with framework BrOnsted sites
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