Centre National De La Recherche Scientifique

Institut Francais Du Pe'trole

Centre National De La Recherche Scientifique, Elf France

Latifa Moudafi

Francois Fajula

Francois Figueras

Pierre Dufresne

Claude Gueguen

Mercedes Vera Pacheco

Serge Nicolas

This invention concerns an omega type zeolite of high thermal stability, present in the form of hexagonal prismatic monocrystals having scored or plane faces of 0.1 .mu.m in edge and 0.5 to 5 .mu.m in length, this zeolite being obtained through crystallization from a mother solution containing a silica source, alumina, metallic oxide, an organic cation and water, in which the alumina source is a crystalline aluminosilicate of which at least one part is in suspension in the mother solution. In its acid form this zeolite can be used as catalyst for hydration of olefins and isomeric change of xylenes.

Omega type zeolite having high thermal stability, its process of

A crystalline alumino-silicate having a powder X-ray diffraction diagram, a specific area, and a porous volume to nitrogen corresponding to offretite, and containing at least one metal selected from the groups I, II, VI, VII, VII, rare earth group, and/or at least an ammonium or quaternary ammonium group, presenting an aspect of the crystals as observed by electron microscopy in the form of hexagonal prisms with well defined edges of a length of 0.5 to 2.5 micrometers and a width of 0.1 to 1 micrometer.

Aluminosilicate zeolite having an offretite structure

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Djemaa Casablanca, Morocco

Latifa Moudafi