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US 5,008,233 AGranted
Novel crystalline silicon enhanced aluminas
AssigneeUop LLC
InventorSusan L. Lambert
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AssigneeUop LLC
InventorSusan L. Lambert
Estimating the term…
This invention relates to novel silicon enhanced aluminas (SEAL) and processes to prepare them. The SEAL compositions have a bulk empirical formula of Al.sub.2-x Si.sub.x O.sub.3 F.sub.x 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 about 300 .ANG., a crystal structure characteristic of alumina, 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 Al.sub.2-x Si.sub.x O.sub.3 F.sub.y 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.
A non-homogeneous crystalline silicon enhanced alumina (SEAL) having a bulk empirical formula of Al.sub.2-x Si.sub.x O.sub.3 F.sub.x where x varies from about 0.01 to about 0.5, the SEAL characterized in that it has a three-dimensional pore structure with the pores having diameters in the range of about 20 to about 300 .ANG., has a crystal structure characteristic of alumina and where the surface of the SEAL has a higher concentration of silicon than the interior of the SEAL.
A non-homogeneous crystalline silicon enhanced alumina (SEAL) having a bulk empirical formula of Al.sub.2-x Si.sub.x O.sub.3 F.sub.y where x varies from about 0.01 to about 0.5, y varies from about 0.01 to about x, the SEAL characterized in that it has both strong and weak acid sites, has a crystal structure characteristic of alumina, has a three-dimensional pore structure with pores having diameters in the range of about 20 to about 300 .ANG., and where the surface of the SEAL has a higher concentration of silicon than the interior of the SEAL.
A process for preparing a non-homogeous crystalline silicon enhanced alumina (SEAL) having a bulk empirical formula of Al.sub.2-x Si.sub.x O.sub.3 F.sub.x where x varies from about 0.01 to about 0.5 comprising contacting a crystalline alumina with a solution of a fluorosilicate salt at a temperature and for a time effective to produce a SEAL having a three-dimensional pore structure with the pores having diameters in the range of about 20 to about 300 .ANG., having a crystal structure characteristic of the crystalline alumina, and where the surface of the SEAL has a higher concentration of silicon than the interior of the SEAL.
A process for preparing a non-homogeneous crystalline silicon enhanced alumina (SEAL) having a bulk empirical formula of Al.sub.2-x Si.sub.x O.sub.3 F.sub.y, where x varies from about 0.01 to about 0.5 and y varies from about 0.01 to about x, comprising contacting a crystalline alumina with a solution containing a fluorosilicate salt at a temperature and for a time effective to produce a crystalline silicon enhanced product and calcining the product at a temperature and for a time effective to form the SEAL composition, the SEAL characterized in that it has a three-dimensional pore structure with the pores having diameters in the range of about 20 to about 300 .ANG., has both strong and weak acid sites, has a crystal structure characteristic of the crystalline alumina, and where the surface of the SEAL has a higher concentration of silicon than the interior of the SEAL.
Dependencies are inferred from the claim text.