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The number and ammonia desorption enthalpy, as a measure of acid strength, of bridging OH groups divided into three portions based on the OH stretching frequency in zeolite β were measured by means of a method of ammonia infrared/mass spectroscopy (IRMS) temperature-programmed desorption (TPD). On the other hand, the optimized structures, wavenumbers and ammonia desorption energies (Edes) of all the...
Infrared/mass spectroscopy-temperature programmed desorption of ammonia experiment on an SSZ-35 zeolite was measured to characterize the acidity. Two kinds of the Brønsted acid site were detected at 3,622 and 3,505 cm−1; these concentrations were nearly the same, and the strengths ∆H were 129 and 117 kJ mol−1, respectively. These Brønsted hydroxyls were identified to be located in the 10-ring and...
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