Societe Nationale Elf Aquitaine

Elf Aquitaine

Fredj Fitoussi

Francois Fajula

Francesco S Di Renzo

Philippe Schulz

Joel Patarin

Thierry Des Courieres

Nisso Barbouth

Thierry Des Courrieres

Activated silica enriched mazzite, production method and application

Process for the synthesis of a silica-enriched crystalline aluminosilicate having the offretite structure from a nucleation gel A containing sources of silicon, aluminium, alkali metal ions, an organic structuring agent and water and a growth gel B containing sources of silicon, aluminium, alkali metal ions and water. The crystals formed are calcined, the ions are replaced by protons and the crystals are subjected to a hydrothermal treatment followed by a treatment with a strong mineral acid. The aluminosilicate formed has a good selectivity in acid catalysis reactions and is characterized by its good stability.

Process for the synthesis of a silica enriched crystalline

Process for the preparation of a crystalline aluminosilicate enriched in silica, having the structure of mazzite, by hydrothermal crystallization of a gel containing sources of silicon, aluminum and alkali metal ions, in the presence of an organic structuring agent, characterized in that the source of aluminum is a zeolite Y in the form of spheres. The mazzite obtained does not contain any silicoalumina debris out of the lattice. It is employed as catalyst for the conversion of hydrocarbons or as molecular sieve.

Process for the synthesis of a crystalline aluminosilicate enriched in

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Lyons, France

Fredj Fitoussi