Abstract: To study the impact of metalloporphyrins on the product distribution and catalyst performance in catalytic cracking process, nickel and vanadium porphyrins were separated from Venezuela 380 heavy oil and Yichang pipeline oil residue, and then added into feedstock with various proportions. The evaluation tests were conducted in a fixed fluidized bed device and the results showed that with the increase of nickel and vanadium porphyrins in heavy oil, the yields of gasoline and diesel fractions decreased significantly, at the same time, the yields of dry gas and coke increased. The selectivity to light oil trend to degrade, and the impact of nickel porphyrin seemed to be more significant. The relative crystallinity of the catalyst decreased due to the presence of nickel and vanadium porphyrins, in which the effect of vanadium porphyrin was greater. However, vanadium porphyrin exhibited negative impact on the activity of regenerated catalyst in someway while nickel porphyrin showed little.

Key words: vanadium porphyrin, nickel porphyrin, catalyttic cracking, product distribution, catalyst