Zeolite of omega structure catalysts
AssigneeInstitut Francais du Petrole
InventorsFrancis Raatz, Christian Marcilly, Pierre Dufresne
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Abstract
The invention concerns a new stabilized and dealuminated zeolite of OMEGA structure, characterized by: a total SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least 10, a sodium content lower than 0.5% by weight, a and c parameters of elementary mesh respectively lower than 1.814 nm and 0.759 nm, a nitrogen adsorption capacity at 77 K higher than about 5% by weight for a partial pressure P/P.sub.o of 0.19, a lattice of mesopores whose radii range preferably from 1.5 to 14 nm. This zeolite can be used in admixture with a convenient matrix in reactions of hydrocarbon conversion.
Claims15
A dealuminated zeolite of omega (or mazzite) structure characterized by:
- a total SiO.sub.2 Al.sub.2 O.sub.3 molar ratio of at least 10,
- a sodium content lower than 0.5% by weight, determined on the zeolite roasted at 1100.degree. C.,
- a and c parameters of elementary mesh respectively lower than 1.84 nm and 0.759 nm,
- a nitrogen adsorption capacity at 77 K, under a partial pressure P/Po=0.19, higher than 5% by weight,
- a pore distribution such that from 0.2 to 50% of the pore volume is provided by pores of radii ranging from 1.5 to 14 nm, the remaining pore volume being provided by pores of a radius less than 1 nm.
Dependencies are inferred from the claim text.