SYNTHESIS OF LARGE PORE ZEOLITES AND ZEOTYPES

摘要

The invention relates to methods for the synthesis of large pore zeolite materials which are related structurally with the Beta zeolite, characterized by the relatively low pH of the synthesis medium and the use of F<-> anions as mineraliser; it also relates to the materials thus obtained which are characterized by their very high thermal stability, low concentration of defects SiO<-> or SiOH, wide range of chemical composition, large pore and because their calcination enables to obtain the acid form without the use of cationic exchange process. Although said materials are related with Beta zeolite, they present occasionally substantial differences with respect to the Beta zeolite. Also claimed is the use of the material obtained in catalytic process of transformation of hydrocarbons and in oxidation process. The method comprises heating at 363-473K a reaction mixture which contains a source of at least one tetravalent element T(IV), optionally a source of an element T(III), optionally H2O2, a structure-director organic cation, a source of anions F<-> and water; the presence of alkaline cations is not necessary.