Process for the synthesis of a silica enriched, cristalline aluminosilicate with the offretite structure.

摘要

Process for the synthesis of a crystalline aluminosilicate enriched in silica, having the offretite structure, from a nucleating gel A containing sources of silicon, aluminium, alkali metal ions, an organic structuring agent and water, and a growing gel B containing sources of silicon, aluminium, alkali metal ions and water. The crystals formed are calcined, exchanged with a proton and subjected to a hydrothermal treatment and then to a treatment with a strong inorganic acid. The aluminosilicate formed exhibits a good selectivity in acidic catalysis reactions and is characterised by its good stability.