Crystalline silicon enhanced aluminas

Details Crystalline silicon enhanced aluminas Crystalline silicon enhanced aluminas

B - Operations, Transporting

01

J

B01J 21/12 (2006.01) C01B 33/26 (2006.01) C07C 4/06 (2006.01) C07C 11/02 (2006.01)

Patent

CA 2040514

This invention relates to novel silicon enhanced aluminas (SEAL) and processes to prepare them. The SEAL compositions have a bulk empirical for- mula of Al2-xSixO3Fx where x varies from about 0.01 to about 0.5. This SEAL material has a three-dimensional pore structure with the pores having diameters in the range of about 20 to abut 300A, a crystal structure characteristic of alu- mina, and where the surface of the SEAL has a higher silicon concentration than the interior of the SEAL. The SEAL is prepared by contacting an alumina with a fluorosilicate salt. This SEAL can be calcined to give a calcined seal with a formula Al2-xSixO3Fy where x is as defined above and y varies from 0.01 to x. The calcined SEAL contains both strong and weak acid sites. These SEAL compositions are useful as hydrocracking catalysts.

ouvelles alumines siliciées (SEAL) et procédés pour les fabriquer. Les compositions SEAL ont une formule empirique générale Al2-xSixO3Fx où x varie entre environ 0,01 et environ 0,5. Le présent matériau SEAL a une structure de pores à trois dimensions - les pores ayant un diamètre allant d'environ 20 A à environ 300 A -, une structure cristalline caractéristique des alumines et une concentration en silicium plus élevée en surface qu'à l'intérieur. On prépare les SEAL en mettant une alumine en contact avec un fluorosilicate. Les SEAL peuvent être calcinées pour produire des SEAL calcinées de formule Al2-xSixO3Fy où x est défini comme ci-dessus et y varie de 0,01 à x. Les SEAL calcinées contiennent des sites acides forts et des sites acides faibles. Ces compositions SEAL sont utiles comme catalyseurs d'hydrocraquage.

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