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The Chemistry and Technology of Petroleum
with the primary catalysts and are available separately in compositions that (1) enhance gasoline
octane and light olefin formation, (2) selectively crack heavy cycle oil, (3) passivate vanadium
and nickel present in many heavy feedstocks, (4) oxidize coke to carbon dioxide, and (5) reduce
sulfur dioxide emissions.
Both vanadium and nickel deposit on the cracking catalyst and are extremely deleterious when
present in excess of 3000 ppm on the catalyst. Formulation changes to the catalyst can improve
tolerance to vanadium and nickel but the use of additives that specifically passivate either metal is
often preferred.
Finally, a process that uses an additive—the Aquaconversion process (Figure 19.3)—is a hydrovisbreaking technology that uses catalyst-activated transfer of hydrogen from water added to the
feedstock. Reactions that lead to coke formation are suppressed, and there is no separation of
asphaltene-type material. Because of the use of an additive/catalyst in the hydrogen transfer process, the aquaconversion can also be classified as a catalytic process.
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