Na₂O (wt%) 0.10, Loss of ignition (wt%) 0.5
(Katada's comment: Loss of ignition can be changed by storage and transfer.)

The elemental composition of the samples was determined by atomic absorption spectroscopy in a Unicam M Series Flame-AAS equipment with an FS 95 autosampler and a GF 95 graphite furnace.

Porosity was determined from N2 adsorption-desorption isotherms recorded on an automated PMI Sorptomatic 1990 instrument at liquid N2 temperature (77 K).
The samples were outgassed in vacuum for 2 h at 523 K prior to adsorption.

IR spectroscopy was used to determine the acid site concentrations of zeolites with pyridine as the probe molecule. All spectra were collected at 423 K on a Nicolet 5700 FT-IR spectrometer. Zeolites were pressed into wafers and pre-treated in vacuum (p < 10^-5 mbar) at 723 K for 1 h. Then they were exposed to pyridine. After outgassing for 1 h to remove physisorbed pyridine, a spectrum was collected for calculating overall BAS and LAS. Then the sample was heated up to 723 K for 30 min to determine strong BAS and LAS.

Chemical composition determined by means of a 715-ES inductively coupled plasma (ICP) Optical Emission spectrometer after dissolution of the solids in a HNO3/HF solution.