Patent ID: 7582278

Claim:
A microporous crystalline zeolite material having, in the calcined state and in the absence of defects in the crystal lattice thereof, manifested by the presence of silanols, an empirical formula x (M 1/n XO 2 ): y YO 2 :SiO 2 , in which M is selected from among H + , at least one inorganic cation with charge +n and a mixture of both; X is at least one chemical element in oxidation state +3; Y is at least one chemical element in oxidation state +4, which is different from Si, x takes a value of between 0 and 0.2 inclusive, y takes a value of between 0 and 0.1 inclusive, and in that the material, as it is synthesised, has an X-ray diffraction pattern with at least the values of angle 2θ (degrees) and relative intensities (I/I 0 ): 2θ (degrees) ± 0.5 Intensity (I/I 0 ) 7.3 s 8.8 vs 9.7 w 16.4 w 19.6 s 20.2 s 21.0 s 21.9 s 24.2 m 26.0 m 27.0 m 27.5 m where I 0 is the intensity of the strongest peak which is assigned a value of 100 w is a weak relative intensity of between 0 and 20%, m is a medium relative intensity of between 20 and 40%, s is a strong relative intensity of between 40 and 60%, vs is a very strong relative intensity of between 60 and 100%.