ZSM-5 zeolites having uniformly large crystals
AssigneeMobil Oil Corporation
InventorsJohn P. McWilliams, Catherine T. Sigal
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Abstract
There is provided an improvement for making large crystallite ZSM-5 zeolites by a method comprising forming the zeolite in a medium containing a combination of tetramethylammonium and tetrapropylammonium cations. The improvement involves the addition of sodium chloride to the aqueous reaction medium to increase the uniformity of crystallite size and to increase the mean crystallite size. Also provided are catalysts comprising these ZSM-5 crystallites and processes for converting organic compounds with these catalysts.
Claims7
A catalyst composition comprising an extrudate of zeolite crystallites and a binder, said crystallites being ZSM-5 crystallites having an average minimum dimension of greater than 3 microns with a size variation of no more than 25 percent in terms of relative standard deviation.
Dependencies are inferred from the claim text.