Catalytic conversion over dehydroxylated zeolite
AssigneeMobile Oil Corporation
InventorsClarence D. Chang, Nai Y. Chen, Stuart D. Hellring, Ying-Yen P. Tsao, Dennis E. Walsh
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Abstract
The acidity of a zeolite catalyst is reduced by calcination in an essentially water-free atmosphere at temperatures above 700.degree. C., preferably from 725.degree. to 800.degree. C., to reduce the alpha value to less than about 10 percent of its original value. The low acidity catalysts produced in this way may be used for conversions requiring low acidity, shape selective catalysis, including dewaxing. The calcined, low acidity catalysts exhibit improved dewaxing activity.
Claims20
A process for catalytically dewaxing a hydrocarbon feedstock which comprises contacting the feedstock with a solid, porous catalyst comprising a zeolite having a Constraint Index of 1 to 12, a silica:alumina ratio of at least 12:1 and possessing acidic functionality, the zeolite having been heated to a temperature of at least 725.degree. C. in an essentially water-free atmosphere to reduce its acidity to an alpha value below 100.
Dependencies are inferred from the claim text.