Process for the synthesis of a crystalline aluminosilicate with a mazzite structure, enriched in silica, the aluminosilicate obtained and its use as a catalyst for the conversion of hydrocarbons

摘要

Process for the preparation of a silica-enriched crystalline aluminosilicate which has the structure of mazzite, by hydrothermal crystallisation of a gel containing sources of silicon, of aluminium and of alkali metal ions, in the presence of an organic structuring agent, characterised in that the source of aluminium is a zeolite Y in the form of spheres. The mazzite obtained does not contain any silicoalumina debris outside the lattice. It is employed as a catalyst for hydrocarbon conversion or as a molecular sieve.