Shape selective zeolite catalyst and its use in aromatic...

Details Shape selective zeolite catalyst and its use in aromatic... Shape selective zeolite catalyst and its use in aromatic...

B - Operations, Transporting

01

J

B01J 29/40 (2006.01) B01J 29/04 (2006.01) C07C 2/66 (2006.01) C07C 4/06 (2006.01) C07C 4/12 (2006.01) C07C 4/18 (2006.01) C07C 5/22 (2006.01) C07C 5/27 (2006.01) C07C 5/41 (2006.01) C07C 6/12 (2006.01) C07C 15/00 (2006.01) C07C 15/08 (2006.01) C10G 11/05 (2006.01)

Patent

CA 2228973

A shape-selective catalyst comprises a synthetic porous crystalline material having the structure of ZSM-5 and a composition involving the molar relationship: X2O3:(n)YO2, wherein X is a trivalent element, such as aluminum, boron, iron and/or gallium, preferably aluminum; Y is a tetravalent element such as silicon and/or germanium, preferably silicon; and n is greater than about 12, and wherein the crystals have a major dimension of at least about 0.5 micron and a surface YO2/X2O3 ratio which is no more than 20 % less than the bulk YO2/X2O3 ratio of the crystal. The crystals have a diffusion-modifying surface coating of a refractory material such as silica or coke. The catalyst is useful in a wide variety of selective hydrocarbon conversion processes, particularly the selective disproportionation of toluene to para-xylene.

Catalyseur à sélectivité de forme composé d'un matériau synthétique cristallin poreux possédant la structure de ZSM-5 et composition impliquant par la formule molaire: X2O3:(n)YO2, dans laquelle X représente un élément trivalent, tel qu'aluminium, bore, fer ou gallium, de préférence aluminium; Y représente un élément tétravalent, tel que silicium ou germanium, de préférence silicium; n est supérieur à environ 12, les cristaux possédant une dimension majeure d'au moins environ 0,5 micron et un rapport de surface YO2/X2O3 non supérieur à 20 % de moins que le rapport de masse YO2/X2O3 du cristal. Ces cristaux possèdent un revêtement de surface modifiant la diffusion en matériau réfractaire, tel que silice ou coke. Ce catalyseur est utile dans une grande variété de procédés sélectifs de conversion d'hydrocarbures, tels qu'en particulier, le disproportionnement sélectif du toluène par rapport au para-xylène.

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