High strength alumina-silica catalyst substrates having high surface area
AssigneeAluminum Company of America
InventorsMarlyn D. Ballain, Leroy D. Hart
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Abstract
Catalyst substrates characterized by superior structural properties and a subsequent high degree of catalytic activity are produced by using a blend of colloidal silica and specially activated alumina which blend is subsequently rehydrated and activated under certain specified conditions. In a preferred embodiment the substrate is activated at a temperature of 1200.degree.-1400.degree.C to provide a substrate characterized by the absence of free silica.
Claims8
An alumina-silica catalyst support characterized by a high relative surface area, a minimum compressive strength of 6.9 mPa and an abrasive resistance under 5% weight loss, said support comprising initially a mixture of 10-28% by weight colloidal silica and 72-90% by weight of an activated alumina made by exposure to a temperature of at least 400.degree. C for a period not exceeding 4 minutes and which mixture has been subsequently rehydrated and then fired at a temperature of not less than about 600.degree. C nor more than about 1400.degree. C.
An alumina-silica catalyst support firable to a surface area of about 100 m.sup.2 /g at 1000.degree. C and exhibiting a minimum compressive strength of 6.9 mPa and an abrasive resistance under 5% weight loss comprising initially 10-28% by weight colloidal silica and 72-90% by weight of an activated alumina made by exposure to a temperature of at least 400.degree. C for a period not exceeding 4 minutes, which mixture has been subsequently rehydrated at a temperature of at least 50.degree. C and then fired for a period of from 3-16 hours at a temperature of not less than about 600.degree. C nor more than about 1400.degree. C.
Dependencies are inferred from the claim text.