CRYSTALLINE SILICATES, PROCESS FOR THEIR PREPARATION AND CATALYTIC CONVERSIONS USING THEM

摘要

Crystalline silicates having: a) a certain specific X-ray powder diffraction pattern; b) a composition expressed in moles of the oxides: p(0.9 +/- 0.3)M2/n0 . p(a X2O3) . SiO2, wherein M = H and alkali metal and/or alkaline earth metal, X = rhodium, chromium and/or scandium, Y = aluminium, iron and/or gallium, a > 0.5,b > 0,a + b = 1,0 < p < 0.1 and n = the valency of M. Process for the preparation of these silicates and process for carrying out chemical conversions using catalysts comprising the silicates.