FCC-Catalyst Coking: Sources and Estimation of Their Contribution during Coker Gas Oil Cracking Process

The coking phenomenon of coker gas oil (CGO) feedstock during fluid catalytic cracking (FCC) using a commercial equilibrium catalyst was investigated. Different types of coke formed via coker gas oil (CGO) catalytic cracking were also analyzed. The coke formed was composed of adsorption coke (C ad ), dehydrogenation condensation coke (C dh ), and hydrogen transfer coke (C ht ). C ad, derived from nitrogen compounds, adsorbed on the acid sites of the catalyst and accounted for 37 wt % of the total coking content under conventional reaction conditions. C dh was formed by the dehydrogenation condensation of polycyclic aromatic hydrocarbons and accounted for about 43 wt % of the total coking content. The coking content of C ht was greatly determined by the degree of the secondary reaction. Coke selectivity can be decreased and C ht yield can be controlled by simultaneously increasing the reaction temperature and shortening the reaction time.