Ammonia IRMS-TPD for Measurements of Number and Strength of Brønsted and Lewis Acid Sites

Important results

Chemical composition and parameters of acidic property

Sample	SiO2 / Al2O3 molar ratio	[Al] / mol kg−1	[Na] / mol kg−1	([Al] − [Na]) / mol kg−1	[B acid] / mol kg−1	[L acid] / mol kg−1	[B acid] / ([Al] − [Na])
IRZ-FAU001	30	1.05	0.032	1.02	0.30	0.03	0.30
IRZ-MFI001	23.8	1.31	<0.004	1.31	1.04	0.02	0.799
IRZ-MFI002	23.1	1.34	<0.003	1.34	1.32	0.00	0.982
IRZ-MFI003	100	0.33	unreported	0.33*	0.25	0.00	0.766

*: [Na] is assumed to be zero.

Distributions of ammonia desorption enthalpy of Brønsted acid sites on various zeolites.

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