Selectivity patterns for cracking hydrotreated resid at 1000 °F and 3-5 s contact time over equilibrium catalyst artificially poisoned with nickel and vanadium were studied. Conversion dropped only slightly, leveling out rapidly with increasing metals level, while C5+ gasoline yield showed an initial decline of 3%, but then remained constant. Coke on fresh feed increased sharply, nearly doubling at the 900 ppm level, out showed little increase thereafter. Hydrogen production increased sharply, but tended to flatten out after the 900 ppm level. The maxima in the gasoline yield occurred at lower conversion for the metals-poisoned catalysts than for the nonpoisoned base catalyst; octane numbers (R + O) with the poisoned catalysts (70-85 vol % conversion) were 87.5-90.0, about one R + O unit higher than the base. PONA analysis of C6+ gasoline showed no unusual trends. Total dry gas yields (wt %) showed little change due to metals poisoning, but composition changed.

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