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Characterization of the acidity of ultrastable Y, mordenite, and ZSM-12 via NH3-stepwise temperature programmed desorption and Fourier transform infrared spectroscopy

✍ Scribed by Wenmin Zhang; Eric C. Burckle; Panagiotis G. Smirniotis

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
329 KB
Volume
33
Category
Article
ISSN
1387-1811

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Ammonia stepwise temperature programmed desorption (STPD) and FT-IR spectroscopy hale been used to study the acidity of dealuminated !3-zeolites with Si/Al ratios in the range of 14.5 to 132. A carefully optimized temperature profile starting at 150°C (in order to exclude physisorbed NH,) revealed f