Abstract
Mixtures of two-, three-, and four-ring (naphthalene, phenanthrene, and pyrene) structures were hydrocracked over a nickel-tungsten sulfide ultrastable zeolite Y catalyst. The hydrocracking of tetralin and phenanthrene proceeds by elimination of butanes to form C/sub 6/ and C/sub 10/ hydrocarbons primarily. Isomerization of saturated six-member rings to methyl-substituted five-member rings is also prominent. The presence of 1-cyclohexyl-2-phenylethane in the products from phenanthrene hydrocracking suggests an alternative reaction path for the hydrocracking of structures containing adjacent saturated rings. Pyrene hydrocracking proceeds primarily by elimination of propane followed by butanes elimination, i.e., C/sub 16/ ..-->.. C/sub 13/ ..-->.. C/sub 10/ ..-->.. C/sub 6/. The C/sub 13/ intermediates are mostly hydrogenated phenalenes. The zeolite-based catalyst was very active in hydrocracking pyrene (critical diameter = 9 A) and smaller molecules. The perhydropyrene component of the feed mixture was relatively inert, but it could not be established whether this was due to a molecular sleve effect or intrinsic chemical kinetics factors.
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